[waqf]

Outbound/return is standard terminology all over the travel industry. Including in UK and US, and for trains and for planes: I'm surprised you're not familiar with it.

"Depart" means something different: it refers to the beginning of each leg of the journey. Its opposite is "arrive". So you might have an outbound leg which departs from LAX and arrives in SFO, and then a return leg which departs from SFO and arrives in LAX.

[rhygar]

Hipmunk.com says depart/return and Iflyswa.com says departing/returning. Your claim is 0/2 so far.

[whatusername]

I went to go and prove you wrong (I personally use outbound/return).

But webjet (Departing/Returning) and skyscanner (Depart/Return) seem to back you up.