As the Circular No. 115/2015/TT-BTC which prescribes a major deduction of Vietnam visa stamping fee (fee to pick up visa on arrival) took effect on November 23, 2015, all users of visa on arrival to Vietnam now enjoy a lower stamping fee.
The “Visa Approval Letter” is a document (approved by the Immigration Office) that allows you to enter and exit Vietnam for a given time period. With the approval letter, you can pick up your visa upon arrival at one of the three international airports in Vietnam (Hanoi airport, Ho Chi Minh city airport and Da Nang Airport)....
The visa applicants need to provide the following information n exactly as shown in their passports:
Normally, the approval letter is processed and emailed to you within 2 working days Guaranteed (excluding Saturday, Sunday and National Holidays).
In urgent case, you are able to have the approval letter within the time frame as below:
We are sorry, it is imposible. The arrival date you provide should be the earliest you plan to arrive,and you can arrive by the issued date or after that date. The departure date is the last day you are permitted to be in the country, Incase you need to stay more than the date issued on visa, we strongly suggest you to get a visa extension.
There will be no problem if you change your arrival airport. Since the visa approval letter works at three international airports of Vietnam:
You still get the visa stamped onto your passport at any of these three airport regardless of which you put in your visa application.