AirHint found the following cheapest one-way flights from Hanoi (HAN) to Bangkok (DMK) in September 2025 (see full year).

One-Way flights

13 Sep	Thai AirAsia	direct
24 Sep	Thai AirAsia	direct
25 Sep	Thai AirAsia	direct
20 Sep	Thai AirAsia	direct
22 Sep	Thai AirAsia	direct
21 Sep	Thai AirAsia	direct
07 Sep	Thai AirAsia	direct
06 Sep	Thai AirAsia	direct
11 Sep	Thai AirAsia	direct
27 Sep	Thai AirAsia	direct

Also check the deals for return flights from Hanoi to Bangkok in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest one-way flights from Hanoi to Bangkok in September from 44€

One-Way flights