Do I need proof of onward travel when flying from Bangkok to Nha Trang, Vietnam?

A traveler arriving in Nha Trang two days earlier was not asked for an onward ticket, but immigration did ask to see their visa. Keep your Vietnam e-visa on your phone and save an offline copy.

For a Bangkok–Nha Trang flight, check-in staff required a traveler to buy a return ticket at the airport before allowing boarding. Arrange a genuine confirmed ticket out of Vietnam in advance to avoid an expensive last-minute purchase.

On another recent Bangkok-to-Nha Trang departure, a passenger was denied boarding until they showed proof of onward travel, and two separate check-in desks applied the same rule. The airline can enforce this before you even arrive in Vietnam.