Do you need a return ticket to enter Vietnam — will they check at the airport?

If you already have a visa (e.g. e-visa) sorted, the airline doesn't require a return ticket at check-in — having the visa is enough for them.

Travellers flying from Tyumen to Cam Ranh on 18 June were worried about not having a return ticket, but neither Russian border control on departure nor Vietnamese immigration on arrival asked about it.

If Russian border control on departure requires proof of onward travel, refundable tickets or unpaid reservations via booking services are a workaround — ask in the community for specific airlines and routes that work.

According to available information, not having a return ticket may slow down passport control on arrival, but does not necessarily result in denial of entry. This is unconfirmed.

A flight arriving around 10am (the only plane at that time) cleared immigration in about 10 minutes. No one asked for a return ticket, and no fast-track service was needed.

Recent arrivals report that immigration officers did not ask for proof of onward travel. Buying a return ticket after arrival appears to be fine in practice.

Arriving in Nha Trang without a return ticket caused no issues. If your stay is flexible (1–2 weeks), you can buy the return ticket after arrival — it's not checked at immigration.