Can I travel without the visa approval letter and get the visa when I arrive in Vietnam?
No, you cannot. You have to print your visa approval letter before hand, and bring it together with passport and photos to arrival airport in Vietnam and present it to both Airlines Officers to board the plane and Immigration Officer to get your official visa stamped. Otherwise, you might encounter...
What if I change my flight and arrive at another airport in Vietnam?
If you arrive at any of the three international airports: Tan Son Nhat (in Ho Chi Minh City); Noi Bai (in Hanoi) and Da Nang (in Da Nang), don’t worry because it is said that in the letter of approval: "The applicants are permitted to pick up the visa upon...
Could I arrive earlier than the granted arrival date in my visa?
No, you can not. You are only allowed to arrive on any date later than the arrival date specified in your visa letter.