AirHint found the following cheapest return flights from London (LGW) to Bangkok (BKK) in September 2026 (see full year).

Return flights

06 Sep - 15 Oct	Air China
23 Sep - 21 Oct	Air China
28 Sep - 11 Oct	Air China
14 Sep - 11 Oct	Air China
21 Sep - 18 Oct	Air China
01 Sep - 15 Oct	Air China
25 Sep - 11 Oct	Air China
30 Sep - 11 Oct	Air China
30 Sep - 21 Oct	Air China
28 Sep - 12 Oct	Air China
11 Sep - 15 Sep	Wizz Air UK
09 Sep - 27 Sep	Wizz Air UK
08 Sep - 24 Sep	Wizz Air UK
05 Sep - 19 Sep	Turkmenistan Airlines
07 Sep - 16 Sep	SWISS
01 Sep - 23 Sep	SWISS
01 Sep - 30 Sep	SWISS
07 Sep - 14 Sep	Air Arabia
08 Sep - 19 Sep	Air France
19 Sep - 26 Sep	Air France

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 473€

Return flights