Most of the time, travelers passing through Vietnam for a layover will only need to stay in the country for less than 24 hours. If you’re one of them, then a transit visa is no longer required. But remember that you must be able to present an onward ticket that shows you’re only going to stay in Vietnam for less than 24 hours. Furthermore, you will have to remain at the airport for the entire duration of your layover.
When you arrive at the airport in Vietnam, simply look for the “transfer signs” or ask assistance from the transfer desk. You will then be assisted towards the waiting lounge where you will be waiting for your next flight. There’s no longer a need for you to pass through the immigration counter or passport control, which is why a visa is no longer required.
If in the event you decide to get out of the airport, then you will have to apply for a Vietnam transit visa even though you only have less than 24 hours in the country.
Transit visa is a short-period, temporary visa needed in some countries to stopover for a minimum of 24 hours in the country. If you are traveller who is about to stopover in Vietnam to get your destination flight, then you may need a transit visa.