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

Return flights

03 Sep - 10 Sep	Emirates
09 Sep - 17 Sep	Wizz Air Malta
16 Sep - 30 Sep	Wizz Air Malta
12 Sep - 04 Oct	China Eastern
27 Sep - 04 Oct	China Eastern
17 Sep - 30 Sep	Wizz Air Malta
14 Sep - 30 Sep	Wizz Air Malta
23 Sep - 30 Sep	Wizz Air UK
24 Sep - 28 Oct	Air China
16 Sep - 13 Oct	Air China
21 Sep - 19 Oct	Air China
18 Sep - 11 Oct	Air China
08 Sep - 19 Oct	Air China
24 Sep - 29 Oct	Air China
15 Sep - 13 Oct	Air China
18 Sep - 22 Oct	Air China
12 Sep - 22 Sep	Wizz Air Malta
15 Sep - 29 Sep	Wizz Air UK
04 Sep - 19 Sep	Wizz Air UK
05 Sep - 19 Sep	Wizz Air UK

Also check the deals for one-way flights from London 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 London to Bangkok in September from $502

Return flights