Call 
1-866-284-3022.
Missed Your Flight? Here’s How Vietnam Airlines Handles Rebooking Option s
Vietnam Airlines offers rebooking for the next available flight. Fees depend on fare. Call 1-866-284-3022 immediately.
Can I Switch My Vietnam Airlines Economy Ticket to Business Class While Rebooking?
Yes, by paying the fare difference + any change fees. Call 1-866-284-3022 to upgrade and reschedule.
Will I Be Charged Extra for Changing an Vietnam Airlines Business Class Reservation?
Flexible Business fares usually allow free changes. Discounted Business tickets may have small fees. Confirm by calling 1-866-284-3022.