I booked an amazing deal on business class for a flight to Frankfurt recently, and I had seen a great price on a return one way flight, but I took the weekend to think about it and now it has jumped up in cost and all the other flights are (of course as you would expect) more if I book one way than round trip.

If I book a round trip flight from a European Airport to the US, and then upon returning home cancel the return ticket, would I get any future travel credit or would it just be a wash?