AirHint found the following cheapest return flights from Birmingham (BHX) to Bangkok (BKK) in September 2025 (see full year).

Return flights

02 Sep - 28 Oct	Pegasus Airlines
24 Sep - 09 Oct	Lufthansa
23 Sep - 09 Oct	Lufthansa
22 Sep - 30 Sep	SWISS
22 Sep - 29 Sep	SWISS
24 Sep - 15 Oct	SWISS
24 Sep - 22 Oct	SWISS
22 Sep - 01 Oct	SWISS
22 Sep - 13 Oct	SWISS
23 Sep - 08 Oct	SWISS
22 Sep - 05 Oct	SWISS
18 Sep - 25 Sep	Air India
11 Sep - 21 Sep	Lufthansa
09 Sep - 23 Sep	Lufthansa
09 Sep - 21 Sep	Lufthansa
10 Sep - 30 Sep	SWISS
10 Sep - 23 Sep	SWISS
17 Sep - 15 Oct	SWISS
09 Sep - 18 Sep	Lufthansa
11 Sep - 25 Sep	Lufthansa

Also check the deals for one-way flights from Birmingham 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 return flights from Birmingham to Bangkok in September from $611

Return flights