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I want to purchase a separate ticket from San Francisco to New York and then fly from New York on the same day with a separate ticket to Germany. I can save money by doing this but do not know if airlines allow this. I'm interested in answers for relevant for both legs on a single airline, or on separate airlines.

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Who can stop you from buying 2 tickets? The airlines don't care – Vitalik Dec 12 '13 at 18:28
Your question title implies you want to know whether it'll be cheaper or not, whereas your question body implies that you want to know whether it's allowed. Yes, no airline can stop you from doing that. – Ankur Banerjee Dec 12 '13 at 19:24
Someone else edited my title. I was not asking if it is cheaper, I was asking if there was some sort of restriction to do this. Somewhere in my past travels I thought this wasn't allowed by airlines, but it may have been a Southwest issue in Texas. Thank you for the responses. – mrluckiest Dec 12 '13 at 21:07
More information would be useful. are the two "legs" booked with the same airline or two different airlines. While technically this is no business of the airlines, some may TRY to stop you doing so if they lose $ as a result. If yu make two bookings yourself and miss the second flight due to eg delays on the first one, the 2nd journey airline may charge you for the missed flight. If you book via an agent as a single journey with two "legs" this should not be an issue, but ask. – Russell McMahon Dec 12 '13 at 22:39
Have you thought about what would happen if your first flight is delayed? If you're on two different tickets, then airline #2 would just cancel your ticket as a no-show, since you wouldn't be there and they wouldn't know why... – Gagravarr Dec 13 '13 at 8:54

How exactly would they "not allow" this? What do you imagine they could legally do to prevent it?

However, it usually has severe disadvantages for you:

  • In most cases it will be more expensive (assuming both legs are the same airline). It's VERY rare for two separate tickets to cost less than a combined one; in fact in many cases the combined ticket will be cheaper than than the longer leg on its own.
  • It may not be possible to check through your baggage, and then you'll have to collect it and check it in again, which can take a lot of time
  • If you miss the second flight because of that or because the first one is delayed, you will have to pay for another ticket
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I disagree with your point about the price always being higher for separate tickets. This varies a lot and depends heavily on what route you are traveling. The other two points are, however, spot on. – Kris Dec 13 '13 at 12:40
@Kris if the two legs are operated by same airlines then what michael said is true.,, – Heidel Ber Gensis Dec 13 '13 at 14:40
What they could do is presumably what American Airlines did to get rid of lifetime passes: Find you in breach of some clause in the contract/general condition of carriage. Not that it seems very likely or worth their trouble but the question does not seem particularly unreasonable. +1 for the disadvantages. – Relaxed Dec 13 '13 at 16:14
Perhaps you meant your first point to apply only to flights on the same airline, in which case it may well be true. I have edited the answer to make this clear--I hope that's within the intent of your answer. If not, feel free to roll-back or modify my edit. – Flimzy Dec 13 '13 at 20:28

I did it once many years ago with a low cost airline that only sells point-to-point tickets (like Southwest but in Europe). As others already mentioned, the downside is that you cannot expect any help from them if you miss the connection (i.e. you might lose the money you spent for the second leg and have to buy another ticket at a premium on the spot or at least pay some extra fee to change the ticket; in the worse case, the return journey for the second leg might be invalidated as well).

Since I also had to collect my luggage and drop it off, go through a passport and security check again (low-cost carriers typically don't offer any connection), it was all really tight even though I had several hours between the flights. That's the reason why you might come across language that strongly discourages it but beyond that, I don't think airlines really care.

Note that some airlines might require you to claim your luggage as a matter of policy but strictly speaking it's not always necessary even if you don't have a single booking for the whole trip, see Can I through check my bags on separate bookings (international flights)? With a bit of luck it could all go very smoothly – but personally, I still wouldn't risk it.

Another issue that hasn't been mentioned yet is that if you want to benefit from a transit exemption in a country for which you would otherwise need a visa, it might be impossible to collect your luggage and remain airside without the airline's assistance (that's not relevant in the US but that's something to keep in mind for other people considering a similar trip elsewhere). Worse case here is that you could be refused boarding on the first leg because you don't have a visa for the destination (that's what happened to the person who posted the earlier question).

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Thanks for your perspectives, insight, and opinions. Based upon all of those aspects, I will be booking a round trip flight and not take my chances. Happy Holidays!!! – mrluckiest Dec 14 '13 at 0:24

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