Round Trip
Make A Round Trip, Go Back And Forth
noun, verbal noun, の adjective
Depart and then restore yourself back to your original departure spot. If you do this (departing and coming back) you have a round trip.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ここから大阪まで、往復でいくらですか？
How much is a round trip from here to Osaka?