Citizens of Thailand won’t need a visa if stay for less than 30 days. In case of intending to stay for more than 30 days, you should apply for a visa.

Thai passport holders, who want to visit Vietnam for more than 30 days, can apply for a visa at embassy of Vietnam in Thailand, here is the address: Chancery: 83/1 Wireless Road, Lumpini, Pathumwan, Bangkok 10330, Thailand.

If don’t have time or far from location of the embassy of Vietnam, you can apply online for approval then pick up visa on arrival at international airports of Vietnam

Visa On Arrival (VOA) is one of the several visa types issued by the Vietnamese Immigration Department to foreigners intending to enter the country.

Please note that unlike visa on arrival of some countries in the world, in order to get visa on arrival of Vietnam, you must have a visa approval letter from the Immigration Department of Vietnam which allows to pick up your visa on arrival at the international airport of Vietnam.

If you want to pick up your visa on arrival at international airports of Vietnam, you should apply online through a website for Vietnam visa or contact your travel agent in Vietnam to ask for a visa approval letter from Vietnam Immigration Department.

Then upon arrival at the international airports of Vietnam, you are required to show the visa approval letter to get visa stamped on your passport.