Vietnam Airlines has several offices in North America, including San Francisco. The address for Vietnam Airlines San Francisco office is:

Address: 88 Kearny St # 1400 San Francisco, CA 94108  
Telephone: (415) 677-0888
Toll free: 1-866-677-8909
Fax: (415) 677-9788

You can also contact the office by emailing: info.us@vietnamairlines.com
The opening hours of San Francisco office is Monday to Friday, 9:00 AM  - 5:30 PM. Note that the office is closed on Saturday and Sunday and major holidays.

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