Upvote:1
Fare difference means that if you rebook the ticket you have to pay for the difference in fare. So if you buy a $900 ticket, cancel the reservation, and then use it for a $1200 flight, you'd have to pay $300 for the fare difference in addition to the change fee and other fees and taxes.
This doesn't apply if the fare is refunded to you, of course.
Upvote:1
In addition to phoogs excellent answer, there is a gotcha when it comes to return tickets.
If you buy your outbound and return flights as part of the same ticket, so a return ticket, and you cancel either portion of the ticket, the other portion will often be re-ticketed as a single and the appropriate fare difference will be applied.
So, if you paid $500 for the outbound and $900 for the return as part of the same ticket, and you cancelled the $900 return portion, then the airline will look to see what price the $500 outbound portion should have been as a single.
If the single for the same portion was being sold for $1000, then you would get back the following:
500 + 900 = 1400 (this is the total you paid)
1400 - 1000 = 400 (this is the re-ticketing of the outbound)
400 - 70 = 330 (this is the residual value)
So in my above example, you would get back $330 (perhaps a bit more if airport taxes and fees are considered separately).
Note that the figures I use are an example - you would need to speak to the airline to see just what the actual figures might be.