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

One-Way flights

09 Sep	Thai AirAsia	direct
13 Sep	Thai AirAsia	direct
23 Sep	Thai AirAsia	direct
17 Sep	Thai AirAsia	direct
04 Sep	Thai AirAsia	direct
07 Sep	Thai AirAsia	direct
18 Sep	Thai AirAsia	direct
06 Sep	Thai AirAsia	direct
27 Sep	Thai AirAsia	direct
29 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 46€

One-Way flights