Give me a round trip ticket, please.

请给我一张往返票。

youdao

I bought a round trip ticket to save money.

为了省钱，我买了一张来回票。

youdao

If someone like yourself volunteers, they receive a free round trip ticket to be used within one year.

自愿的人可以得到一张一年内有效的免费往返票。

youdao

Look for somebody who's bought a one-way ticket, or look for somebody who's bought a round trip ticket.

NPR: Airport Security Marked by Hassles

Umar Farouk AbdulMutallab, the man accused of trying to blow up a U.S. airliner bound for Detroit, Michigan, had a one-way ticket from Accra, Ghana, to Lagos, Nigeria, and a round-trip ticket for his trip from Lagos to the Netherlands and then to Detroit, according to the Nigerian Aviation Authority.

CNN: Are dogs the key to bomb detection at airports?

When Air Canada implemented its new pricing structure, it also eliminated many travel restrictions that passengers hated, such as requiring a Saturday-night stay and a round-trip ticket to get the lowest fare.

CNN: Pros and cons of a la carte airfare pricing