When does the Vietnam visa start? Follow Answer The start date is based on the date of entry listed on the Vietnam visa application. You will not be able to enter Vietnam prior to that date. Published March 2017 Peninsula Visa Inc Related articles Is a Brazil visa valid in an expired passport? How far in advance can I apply for a Vietnam visa? Is a Vietnam visa valid in an expired passport? Is a China visa valid in an expired passport? When does the Brazil visa start? Comments 0 comments Article is closed for comments.