round-trip ticket
US /ˈraʊnd.trɪp ˌtɪk.ɪt/
UK /ˈraʊnd.trɪp ˌtɪk.ɪt/

1.
bilet w obie strony
a ticket that allows a person to travel to a place and back again
:
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I bought a round-trip ticket to New York.
Kupiłem bilet w obie strony do Nowego Jorku.
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How much is a round-trip ticket to London?
Ile kosztuje bilet w obie strony do Londynu?