No worries. Be kindly informed that there will be no problem if you change your arrival airport. Since the visa approval letter works at three International Airports of Vietnam:
- Noi Bai International Airport in Hanoi
- Tan Son Nhat International Airport in Ho Chi Minh City
- Danang Airport in Danang City
You still get the visa stamped onto your passport at any of these three airport regardless of which you put in your visa application. Do not forget carefully check Vietnam visa requirements as well as the relevant documents because the airline staffs will check your eligibility carefully.
Vietnam Immigration Services will support the applicants until you get a stamp on your passport. If you have any concern, feel free to contact us.