Originally Posted by androobe

Personally as a Brit, I don't think "round trip" makes much sense. It implies an indirect route by the use of the word ROUND. To me, this usually means something of circular shape, like travelling round the world, but not in straight line from one place to another and back again, there is nothing very round about that.

By definition return means you are coming back to where you start from, so if you ask for a return ticket you want to come back, if you take your return flight, it means you are currently returning having already taken the outbound. In the UK you buy a Return train ticket, but you get 2 separate tickets, the first one says "OUT" the second one says "RTN", as in the return portion of a return trip. If you buy a one way you get a SGL (single).