Hi, please let me know the visa fee I have to pay if I have already the approved letter. Thanks you!

Thanks for your concern! - In your case that you enter Vietnam by air and have already the approved letter, you just only pay for stamp fee directly to Immigration Officers at the airport. It’s about USD 25 for single entry and USD 50 for multiple one. - We hope this information is clear and helpful for you. If any unclear, please let us know. Have a nice trip to Vietnam! Vietnam-Evisa.org