For my specific itinerary with United Airlines, one-way flight from A->B is 900$, and a return flight A->B->A is 1350$. They are offering free changes right now https://www.united.com/ual/en/us/fly/travel/notices.html#ChangeFeeTerms

I am pretty sure I will need to change the return leg because I don't have fixed plans for the return yet.

My question is - How is the price for new ticket calculated if changing only the return leg of a flight? Should I a return flight since it's cheaper (for a 2-way flight) or book only 1-way because the difference in airfare when rescheduling the return leg could be substantial?

  • Remember that there may be no change fee, but you still have to pay the difference in fare, if any. Commented Aug 9, 2020 at 21:12

1 Answer 1


One common method airlines use to calculate new fares is to recalculate the entire itinerary (including any part you have already flown) as at the day you make the change, and charge you the difference. The exact method will depend on the rules applicable to the fare classes you booked.

If the new fare is lower you might get a credit or refund, or you might forfeit the balance, depending on the airline policy.

Should you buy a return or two one-way tickets? All I can say is that tickets bought well in advance tend to be cheaper than tickets bought close to departure.

Since you're also getting a return-ticket discount I'd expect that booking a return ticket now and changing it will work out cheaper than buying a one-way ticket now and another later. However, depending on the exact changes you make and when you make them, that is not guaranteed.

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