Heavy downpour on Tuesday afternoon prevented more than 20 flights from landing in Tan Son Nhat Airport, as many had to circle for hours or land elsewhere.
A source of Vietnam Airlines said two of its flights from Singapore and Nagoya were diverted to Can Tho Airport in the Mekong Delta, around 160 kilometers away, as the early monsoon rain lasted for a couple hours.
Two flights from Incheon had to land in Cam Ranh Airport near the central beach resort town of Nha Trang, more than 400 kilometers away, and one flight from Hanoi in Phnom Penh.
Domestic flights of the budget carrier Vietjet Air also had to land in Cam Ranh or Da Nang.
Jetstar Pacific said three of its domestic flights were diverted, but did not specify where to.
The carriers said the rain combined with heavy winds caused troubles to the pilots. It's not clear how long the affected aircraft would have waited before continue flying to Ho Chi Minh.
Later flights were rescheduled as a result, they said.