Visa on Arrival ( VOA ) is a legal document approved by the Department of Immigration. This is a convenient alternative way to obtain the Visa Approval Letter (pre-approved visa letter) through our Visa Vietnam Online service to check-in and pick up the actual visa stamp at your destination international airport in Vietnam upon your arrival. VOA involves a simple online application and it doesn’t require you to send a passport or photos. The process of applying for a Visa On Arrival can be completed within 2 working days, if there is emergency case, it is possible to obtain a Visa Approval Letter within few hours.