What the official source says, who checks it, and the cheapest flights out of the country if you need to book one.
United States
Onward ticket required
The official source says you need a return or onward ticket to enter.
“Be in possession of a round-trip ticket that will transport the individual out of the United States to any other foreign port or place”
Source: U.S. Customs and Border Protection · see the source · checked on 12 October 2026
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Onward ticket required · 12
May be asked for · 21
No official rule found · 6
Rules taken from official sources (governments, embassies), with their date. They change: check before you leave, and with your airline.