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

Return flights

20 Sep - 20 Oct	Air China
06 Sep - 19 Sep	Air China
15 Sep - 20 Sep	Air China
04 Sep - 14 Sep	Air China
10 Sep - 21 Sep	Air China
04 Sep - 12 Sep	Air China
08 Sep - 16 Oct	Air China
10 Sep - 15 Sep	Air China
21 Sep - 13 Oct	Air China
06 Sep - 06 Oct	Air China
30 Sep - 11 Oct	Air China
28 Sep - 21 Oct	Air China
27 Sep - 18 Oct	Air China
24 Sep - 24 Oct	China Eastern
19 Sep - 30 Oct	China Eastern
21 Sep - 08 Oct	Wizz Air UK
14 Sep - 20 Sep	Wizz Air UK
12 Sep - 26 Sep	Turkmenistan Airlines
08 Sep - 20 Sep	Air Arabia
08 Sep - 29 Sep	Air Arabia

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 479€

Return flights