Qatar Airways is currently providing many flights from various departure points in the world to Vietnam, but most of these flights have to land at Doha International Airport, and then the passengers are transferred to other flights that go directly to Vietnam.
During the week, Qatar Airways have 4 direct flights from Doha (GMT+3) to Hanoi (GMT +7) at 1.00 (Doha time) on Monday, Tuesday, Friday and Saturday.
Flights from Doha to Ho Chi Minh City (GMT +7) are operated daily, with 4 direct flights at 7.05 (Doha time) on Monday, Tuesday, Friday and Saturday, and other 3 flights at 1.00 (Doha time) on Wednesday, Thursday and Sunday at 1.00 am are non-direct as they stop in Bangkok before flying to Vietnam.
Qatar Airways also have flights directly from Bangkok to Vietnam that lands in Hanoi and Ho Chi Minh City. All these flights depart at 13.00 (Bangkok time), but flights to Hanoi only operate on Monday, Tuesday, Friday and Saturday, whereas on Wednesday, Thursday and Sunday are flights to Ho Chi Minh City.