What the official source says, who checks it, and the cheapest flights out of the country if you need to book one.
Thailand
Onward ticket required
The official source says you need a return or onward ticket to enter. Checked by border control on arrival.
“Upon arrival, foreign visitors must present the necessary documents to immigration officers, including proof of accommodation and proof of onward travel scheduled within 30 days of the arrival date.”
Source: Royal Thai Embassy, London · 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.