one-way ticket
US /ˌwʌn.weɪ ˈtɪk.ɪt/
UK /ˌwʌn.weɪ ˈtɪk.ɪt/

1.
单程票
a ticket that allows a person to travel to a place but not back again
:
•
I bought a one-way ticket to London.
我买了一张去伦敦的单程票。
•
She booked a one-way ticket to Australia, planning to stay indefinitely.
她预订了一张去澳大利亚的单程票,打算无限期地留下来。