Proof of onward-travel required at land-borders when entering Thailand without a Visa?
It is very clear that it is required to have proof of an onward flight to an international destination within 30 days of arrival, when entering Thailand by air without a Visa.
True, it is seldom checked by Thai border-immigration when arriving at one of Thailand's main international airports. But that is most probably because the airline is required to check whether you have such an onward flight reservation when you are boarding your flight with final destination Thailand. And yes, some airlines do not check this.
But considering that being denied boarding due to not having such onward flight reservation, it is highly recommended meeting that requirement.
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Also it looks that the requirement is mainly enforced (by the airlines) on long-haul flights, and that for short flights from neighbouring countries into Thailand that it is almost never checked.
But what about entering Thailand without a Visa using a LAND-BORDER?
I have never heard of anyone being refused entry for not meeting that proof of onward travel requirement, when entering Thailand VisaExempt using a land-border.
So I presume that onward-travel requirement is only enforced by the air-lines on long-haul flights.
Is that correct, or can you be denied entry for not meeting that requirement when arriving by air from a neighbouring country or when entering via a land-border?