Fetching details from the dictionary...

the way there; outbound leg; outbound trip; departing leg
bound for ...
outbound ticket
往きは電車で行って帰りはバスにしよう。
Let's take the train there and the bus back.
往きの飛行機は朝八時の便を予約した。
I booked the 8 a.m. flight for the outbound trip.
往きは三時間かかったが帰りは二時間だった。
The trip there took three hours, but coming back was two.