I had assumed that buying round-trip plane tickets saves a lot of money, but lately I've been comparing prices and the round-trips I've seen are almost identical in price to just buying two one-way tickets separately.

If round-trip tickets are just supposed to be more convenient, then that benefit surely seems outweighed by the flexibility that one-way tickets give you. Not only is it easier to choose different airports for your outbound and inbound flights, but you can avoid the usual traps if you want to change something later on. I've been in situations where I've needed to change just the outbound flight and the cheapest option was to just buy a new one-way ticket but I couldn't do that because the rigidity of the round-trip ticket prevented a traveler from boarding a return flight if they didn't board the outbound flight. With a round-trip ticket, the whole thing counts as one. If you want to make one little change to one leg of one flight and you can't do it, the whole ticket is wasted. (In the same vein, it seems you also get less flexibility and almost no benefit from putting multiple passengers on the same ticket.)

So my question is this. Is convenience and a marginal (perhaps even only perceived) cost difference the only benefit to a round-trip ticket? Or is there some other purpose I'm not aware of?

EDIT Nov 3: I apologize for not considering international travel. It's been many years since I've flown outside of the US.

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    I would doubt your presumption that round-trip tickets are the same price as two one-way tickets. In my experiences for many trips this is simply not true, but of course this doesn't not have to apply for all trips and carries (especially LCC are know not to care). However, there are simply many people who want a round-trip-ticket, because the do not want to get out of the city, especially business travellers and many tourists.
    – dirkk
    Commented Nov 2, 2017 at 15:39
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    @JimMacKenzie You are right, especially for intra-US this applies. It is the large exception. It's very different in Europe, though
    – dirkk
    Commented Nov 2, 2017 at 17:21
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    @Johns-305 A round-trip ticket is specific, because of how it is handled. You may have virtual coupons for each segment, but you have bought transportation from A to D (perhaps via cities B and C). Your return ticket takes you from D to A (perhaps through cities E and F this time). If the airline has issues honouring your ticket, it need not route you through B/C or E/F, because you have paid from A to D. Many carriers will let you do multi-stop or open jaw tickets without penalty compared to round trip tickets but it will depend on how they do their fares. Commented Nov 2, 2017 at 22:10
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    @Johns-305 Maybe it's the pedant in me, but I don't quite agree. You are right that round-trip, open jaw and multi-stop tickets (that end at the originating airport) are all equally protected. One-ways are protected but other flights (e.g. the other one-way trip home, on another ticket) is not protected from things that happen to the first ticketed flights. Commented Nov 2, 2017 at 22:37
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    "round-trips ... are almost identical in price" this is simply completely wrong.
    – Fattie
    Commented Nov 3, 2017 at 17:56

13 Answers 13


There are a couple of very different cases here:


Especially on longer (non-regional) international flights, a round-trip ticket usually still costs substantially less than two one-way tickets (except award tickets purchased with points/miles.) I have encountered many instances where a one-way ticket was actually more expensive than the entire round-trip on the same route for international tickets. This used to be the case for U.S. domestic fights, too. Sometimes it still is, but usually nowadays a round-trip ticket costs exactly the sum of the two one-way fares for domestic tickets in the U.S., as you've noticed. Domestic/regional flights outside of North America are increasingly adopting the same model of making a round-trip price equal to the sum of the outbound and inbound one-way segments, but it's not yet as common outside of North America as it is within North America.


Airline Delays/Cancellations

If your outbound flight gets delayed so much that your trip would be in vain (say, you had a business meeting or a conference to attend and the delay has already caused you to miss it,) the Contract of Carriage generally allows you to cancel the entire trip for a refund. In the case of a round-trip ticket, the entire ticket, including the return flights which were potentially not delayed, would be cancelled and refunded. In the case of two one-way tickets, the airline is under no obligation to refund the return flights (though sometimes they do anyway, particularly if it's on the same airline and more likely if you're a frequent flier with them.) So, purchasing a round-trip ticket can provide some protection against flight delays/cancellations.

Changes for Personal Reasons

When something comes up that causes you to need to change your trip schedule, the airline change fees are usually charged per ticket rather than per segment. So, if you need to delay your whole trip (outbound and inbound) by a day, for example, you'd need to pay the change fee only once with a round-trip ticket vs. twice with 2 one-way tickets.

On the flip side of this, though, as you've noted already, sometimes the change fee costs more than a one-way flight and you only need to change your flight schedule for one segment. In this case, it's actually cheaper to make the change with the two one-way tickets by simply cancelling the one you want to change and booking a new ticket for that segment. This is much more likely to be the case on relatively short domestic routes where the fares are already very low. It is less likely to be the case on longer trips where the one-way fares are probably higher than the change fees anyway.

2024 Update: While both of the above reasons do sometimes still apply, there have been some significant changes to the situation since I originally wrote this answer. In particular, since 2020, almost all full-service U.S. airlines have dropped their change and cancellation fees entirely on all but their "Basic Economy" fares (and Southwest never had such fees to start with.) As a result, the flexibility-related advantages to round-trip tickets mentioned in the answer are no longer as applicable to flights on normal economy or higher fares on most non-ULCC U.S. carriers, since you can now change or cancel those tickets for any reason at no cost.

However, those reasons still apply for most low-cost carriers as well as most carriers outside of the U.S.

Additionally, the trend mentioned in the answer of full-service carriers moving more towards pricing short-haul round-trip flights the same as the sum of the one-way components has continued and this is now quite a bit more common outside of North America as well than it was back in 2017.

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    "Especially on international flights" I think that's a very US-centric statement. Really, you're talking about the difference between traditional and budget carriers. When you live in a huge country like the US, budget carriers do mostly internal flights and most international flights are with traditional carriers. But, somewhere like Europe, the great majority of flights are international flights and if, say, you fly from Poland to the Netherlands on a budget carrier, you'll find that a return ticket costs basically the same as two one-ways. Commented Nov 3, 2017 at 11:13
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    I can weigh in on the cost statement. Surely this is anecdotical, but I wanted to travel HEL–TXL two years ago. A one-way flight would actually cost more than double the price of the entire round trip.
    – Jan
    Commented Nov 3, 2017 at 13:04
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    @DavidRicherby When I said "international," I meant basically "not domestic or regional." This is why I described the opposite type of flights as "domestic/regional" when discussing areas outside of North America later in that paragraph. Within North America, it's not a matter of what type of carrier you're flying on. It applies just as much to the legacy carriers as to the ULCCs. Outside of North America, it's mostly LCCs, but expanding to legacy carriers on domestic/regional routes.
    – reirab
    Commented Nov 3, 2017 at 15:02
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    It's quite entertaining how both North Americans and Europeans think the whole world runs the same way as it does in their own region and the ignorant residents of the other region are just experiencing minor exceptions to the general rule.
    – user541686
    Commented Nov 4, 2017 at 8:51

It used to be advantageous to buy round-trip tickets, and of course it's less work to do so since you only have to pay for the ticket once. For some travel, such as overseas travel, on some airlines it's still cheaper to do a return flight or an open-jaw flight (e.g. Toronto-London, Paris-Toronto) instead of buying each leg on a separate ticket.

One advantage to buying on the same ticket is that if the first flight is delayed or cancelled, you may have an easier time persuading the airline to change the return flight to compensate (particularly if the outbound flight is delayed by a day or more). Also, for very short trips, you may need to cancel the entire trip if a delay happens (e.g. I'm flying Regina-Moncton tomorrow, but coming home the following night, and my event is Saturday morning; if I can't arrive by Saturday morning before 9 am, there is no point in me even going there).

  • Okay, but I've never known an airline to cut me any slack. Are you saying if you have to cancel your whole trip that would be easier to do if it's round-trip instead two one-ways? Commented Nov 2, 2017 at 17:44
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    @KyleDelaney I'm saying if a delay caused by the airline caused the entire trip to be superfluous, they'd be more likely to let you cancel the entire trip than if you had it on two separate tickets. If your schedule changes, you'd be subject to the same rules whether booked round-trip or as two one-ways, and this would depend on the class of ticket. But if it's their fault, booking the flights together can help. Commented Nov 2, 2017 at 17:57
  • I see, then I guess it's like a form of travel insurance. Commented Nov 2, 2017 at 17:58
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    @KyleDelaney In an indirect way. You always have this if the delay is their fault, but it only applies within the ticket for the flight in question. Commented Nov 2, 2017 at 17:58
  • Also, selling and processing both tickets in one transaction saves the company some work (and money). Commented Nov 3, 2017 at 13:13

This is one way:

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This is return:

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Of course you need to add the other leg to it but that's <$400 and so you are still looking at a ~$600 ticket vs a $1984 ticket.

In general, this doesn't happen on routes where low cost competition exists but on intercontinental travel, it's still very strong.

  • Great example. I often similar pricing and I am baffled at what the airlines are thinking selling half the trip for such much more when one can simply get two ways, reschedule or even discard it and come out way ahead in terms of costs.
    – Itai
    Commented Nov 3, 2017 at 14:53
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    Finding this wasn't hard because SFO-LHR is always like this, sometimes even worse (!).
    – user4188
    Commented Nov 3, 2017 at 17:47
  • Ay, that's nuts. Commented Nov 3, 2017 at 18:03
  • In 2024 it's now ~$100 cheaper to buy a one-way ticket for the same route and airline but on a per-leg basis round trip is still way better.
    – JonathanReez
    Commented Feb 26 at 4:25

As seen from the other answers, people have very different experiences when it comes to comparing a round-trip to the two legs being ordered separately.

Historically, things have gone a bit like this:

  • A round-trip was just the cost of the two legs

  • Then discounted fares were introduced (so-called APEX fares). The idea was to make sure business travellers (who supposedly have more money to spend) spend more than holidaymakers. This was done by imposing rules on the whole trip, such as the obligation to spend at least one weekend at the destination, or a minimum duration at the destination. To make this possible, it required the round-trip to be sold at once rather than the two legs being sold separately. This is what introduced the big difference between the round-trip (which is discounted) and separate flights (which are not). Note that you usually see only the lowest fare, but rest assured that there is still a full-fare round-trip in the system with the same cost as the two legs.

  • Then low-cost carriers came in, and decided that low fares were for everyone, and that the only important factor for them is whether the flight is in high demand or not. Usually at LCCs, beyond an usually small admin charge / booking charge / credit card charge, a round-trip is exactly the same cost as the two legs put together. And I believe most don't care if you don't use one of the legs on a round-trip.

  • Of course the incumbents had to do something, and you end up with a pretty interesting situation: if there are LCCs with a significant share on that city pair, then they apply fares (and possibly rules) close to those of the LCCs. If not, they continue to apply the usual round-trip-with-conditions-is-cheaper rules.

The end result is that on most popular short-haul/medium-haul routes, there is little difference between the two (at least in term of cost -- the incumbents may still apply sordid rules), while on long-haul routes (where there are few LCCs if any at all), or less popular short-haul/medium-haul routes, you still can see a big difference.

Now, when it comes to picking one over the other, pay attention to the fare rules. Usually when flying with a LCC (at least the major ones), you won't see much of a difference between the two in terms of flexibility. You'll just save a few bucks/quid/euros and a few minutes booking as a round-trip. When flying with an incumbent, all bets are off.


It really depends what flights you are looking at. Some airlines simply price their round-trips as the sum of two one-way tickets but that is the exception rather than the norm. Most times, it is cheaper, and often by a considerable amount, to buy a round-trip ticket.

Therefore the main reason is to save money.

There are other conveniences such as getting your entire journey determined at once which saves the hassle of trying to find a matching pair of tickets that suits your needs. The ticket makes a single entity of your trip, this makes it cheaper to reschedule since you only pay once, to cancel since there is only one cancellation fee and to have a single itinerary showing arrival and intended departure date which is sometimes asked by immigration. When you have two one-way international tickets, checkin often cannot be done online and you are asked to give your return ticket number at the counter when checking in.

  • 1
    "this makes it cheaper to reschedule since you only pay once, to cancel since there is only one cancellation fee" This is only true if you have to change or cancel both flights in the trip. If you only want to change one flight, it's usually cheaper to buy a totally new one-way ticket than to pay $50 to upgrade your ticket to a changeable one and pay the $200 change fee. Commented Nov 2, 2017 at 18:27
  • That clearly depends where you fly. In my whole life I have had only one ticket under $50 and less than ten under $250 compared to hundreds over and by much most of the time.
    – Itai
    Commented Nov 2, 2017 at 18:34
  • That's because you're buying round-trip tickets. I'm talking about one-way tickets. Commented Nov 2, 2017 at 18:36
  • A round-trip ticket if often more expensive than a single one-way ticket! Even so, all tickets I have bought under $250 were all one-way tickets. I usually look for them to get flexible travel planning but many times end up with embedded round-trips to save money.
    – Itai
    Commented Nov 2, 2017 at 18:48
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    Oops. I meant the other way around and, yes, I do find it very frustrating. Going from Montreal to Madrid for example one-way is often more expensive than going from Montreal to Madrid and back, even though it's half the flight! This is an example I found last month but I have seen this countless of times.
    – Itai
    Commented Nov 2, 2017 at 19:07

There is another significant advantage of buying a round trip that has not been mentioned. All airlines I have tried to book with so far do not quote the price in the local currency of your IP address but in the local currency of the departure airport.

So if I were to book a holiday to Singapore using Singapore airlines and if I book this holiday as two one-way tickets, I would be able to pay my outbound ticket in my home currency (with no additional credit card charges or many more options for people without credit cards) — but I would have to pay the return ticket in Singapore dollars. I might not have the option of paying by card in Singapore (especially if I don’t have a credit card) and wiring fees may make the ticket more expensive.

Furthermore, I typically know my home currency well, but do I know how it compares to Singapore dollars? I may think I’m looking at a great deal while in fact it is not one. See this previous question.

(Of course, this all applies only to international flights where the two countries do not share the same currency and no currency is pegged to the others. Within the Euro zone for example, this is no problem.)

  • +1'd - Airport taxes and fees may change too. It is not just the exchange rate/card fees. Commented Nov 3, 2017 at 13:14
  • @Mindwin Tbh, I treat airport taxes etc. as black boxes that I can’t influence. I could be wrong doing so ;)
    – Jan
    Commented Nov 3, 2017 at 13:18
  • But you can surely compare the "sizes" of two black boxes that fit the same purpose. Commented Nov 3, 2017 at 13:22
  • The airline's internal exchange rate is often worse than your home bank's, so I'm not sure of paying in Singapore dollars would be a disadvantage.
    – JonathanReez
    Commented Nov 3, 2017 at 13:25
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    I'm saying you should compare the options. E.g. when I book with WizzAir I always pay in HUF instead of using the airline's suggested currency.
    – JonathanReez
    Commented Nov 3, 2017 at 13:39

Many of the answers address the purpose of a round-trip ticket to the traveller. But it's the airline that makes the decision to offer round-trip tickets for less than the price of two one-ways, if they do this. So what's in it for the airline? I can think of four possibilities:

  • Customer convenience: if travellers see the process of booking an airline ticket as a pain, being able to book both legs of the trip in one operation may be a more attractive option. Perhaps this is a hangover from the days of travel agents and paper tickets which is less applicable nowadays.
  • Fixed and variable costs: if the booking process costs the airline more than a negligible amount, they may be able to save some of this cost when a customer makes both bookings in one transaction, and can therefore pass on some of this saving to the customer.
  • Tradeoff of cost and convenience: If all prices are one-way and airline X has the outward flight I want to take but airline Y happens to fly at a more convenient time than X on the way back, I'll fly out with X and back with Y. In that case it's in X's interest to offer me a discount on their return flight, so they make a reduced profit from me on that flight rather than none at all.
  • Market segmentation: It's quite likely that travellers who want to book one-way journeys are different from travellers who are willing to book a round trip. Maybe they're more likely to be flying on business or at short notice. In that case they may be willing to pay more, on average, for their flight than round-trip travellers. So what appears to you, the round-trip customer, to be a discount is in fact a premium being charged to one-way customers because that's what the market will support.

If I had to bet which of these was most significant, it'd be the last one.


I've seen cases where a single one-way ticket is 2 times more expensive than a round-trip ticket. (Instead of being 2 times cheaper).

This does not make sense, but that's how it is.

It's also advantageous to buy both tickets be beforehand, as the tickets become very scarce and more expensive towards the travel dates.

  • Ah yes, I had one such case with HEL–TXL. I only needed one way which even was more than twice as expensive as the return flight. And another recent example, MUC–KIX gave the same picture.
    – Jan
    Commented Nov 3, 2017 at 13:06
  • I'm wondering if there's some push to discourage one-way international flights in order to reduce illegal immigration. Commented Nov 3, 2017 at 18:08
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    @KyleDelaney The irony is that I used that two way ticket as a one-way. They add some scary language about fines if you do not use the other half, but there is no country in the world that would let them act on that BS.
    – Ark-kun
    Commented Nov 4, 2017 at 0:11

In my experience in the USA, low-cost (budget) airlines such as Allegiant, Frontier, Spirit, etc. are more likely to have the total cost of a round trip ticket be the sum of the 2 one-way fares. I don't know if this is more based on their route models which are a lot of individual routes and not a hub/spoke model or just easier to deal with from an administrative standpoint, but that's what I've casually seen.

It's the more full-service (if you can call them full-service nowadays with all the cutbacks) airlines such as Delta, United, American, etc. that you're likely to get a lower price on a round trip ticket than two one-ways.


I know you weren't thinking of international flights, but consider the scenario.

You disembark off the plane and sidle up to the immigration desk. You are savvy to the immigration process, and you know they're primarily concerned with two things:

  • you won't overstay your visa
  • you won't seek employment

They look at documents you've previously submitted and other facts about you. You're not an automatic "refuse", but you're not an automatic "land" either: you are a wobbler, with several yellow-flags. So you know they'll be taking a closer look at you, with the question "How do we know this 2-week visit is for real, and you'll return when you say?"

And there in your hand is your round trip ticket. Sure, you can argue that's not a huge thing in your favor. But lack of one would be conspicuous, and probably tip the scales against you. So it definitely helps.

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    A separate ticket for the return will work as good as a round trip ticket, as far as I understand. Even better might be a ticket to a near country and solid plans for your trips there.
    – Willeke
    Commented Nov 4, 2017 at 11:32
  • @Willeke good point, one of my favorite imkigration examples is the drifter who has no ties, just the kind you reject, but is a hardcore Swiftie who has a 7 year history of following Taylor Swift around to every concert in every country, and onward tickets and hotel to the next country on their tour... overstay risk, nope. Commented Nov 4, 2017 at 17:33
  • In four years of wandering, rarely have I arrived with an exit ticket and rarely with any lodging reservation. Yet in two dozen countries, none has ever refused entrance, and only UK has even asked.
    – WGroleau
    Commented Jul 23, 2018 at 23:37

I recently booked travel for business. Someone else is paying for it. I booked a round trip ticket because it was easier than booking two one way tickets.

The process involved me doing research, sending quotes to someone else, waiting for someone else to approve the expenditure, buying the ticket, submitting paperwork for reimbursement.

If I booked two one-ways, then what if the return flight had sold out after I paid for the flight out there. I would have to research another return flight and get it approved. What if there were no approvable return flights left? could I get a refund on the outbound flight or would my employer reimburse me for the cost?

These concerns seem unlikely but why take a chance to save someone else some money.

I don't know if I could have saved money using two one-way tickets b/c no one paid me to find out.


The fallacy in the question is stereotyping (and I don't mean two hands on the keyboard). When you purchase travel for a trip, you make your decisions on your personal values and circumstances for that trip. Not on some universal rule that applies to all trips to all places for all time.

For me, the flexibility is often paramount, but not always.

Many other occasions, price is important. So I compare two one-way tickets vs. one round-trip ticket. Sometimes the two is better than the one. Sometimes not.


There is one specific situation in the railways, where picking a round trip versus two one-way legs can also make a difference.

The French railways SNCF sell a discount card called Carte Avantage. The discount applies if your one-way trip is on a Saturday or a Sunday, or you book a round-trip that has a Friday, Saturday or Sunday night in-between. This is basically a way to deter business travellers from using this offer. There is another discount card available that caters more to them, obviously a tad more expensive.

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