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

Return flights

26 Sep - 27 Oct	Wizz Air UK
22 Sep - 27 Oct	Wizz Air UK
06 Sep - 27 Oct	Wizz Air UK
27 Sep - 27 Oct	Wizz Air UK
29 Sep - 27 Oct	Wizz Air UK
07 Sep - 27 Oct	Wizz Air UK
09 Sep - 27 Oct	Wizz Air UK
21 Sep - 27 Oct	Wizz Air UK
01 Sep - 30 Oct	Wizz Air UK
02 Sep - 21 Oct	Air China
24 Sep - 29 Sep	Air China
04 Sep - 29 Sep	Air China
05 Sep - 29 Sep	Air China
18 Sep - 29 Sep	Air China
02 Sep - 07 Sep	Air China
02 Sep - 09 Sep	Air China
02 Sep - 29 Sep	Air China
04 Sep - 09 Sep	Air China
22 Sep - 29 Sep	Air China
02 Sep - 08 Sep	Air China

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 389€

Return flights