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

Return flights

30 Sep - 11 Oct	Wizz Air UK
30 Sep - 07 Oct	Wizz Air UK
19 Sep - 10 Oct	Wizz Air UK
28 Sep - 13 Oct	Wizz Air UK
29 Sep - 08 Oct	Wizz Air UK
29 Sep - 07 Oct	Wizz Air UK
18 Sep - 01 Oct	SunExpress
18 Sep - 26 Sep	SunExpress
02 Sep - 24 Sep	Wizz Air UK
05 Sep - 24 Sep	Wizz Air UK
17 Sep - 29 Sep	Wizz Air
28 Sep - 08 Oct	Wizz Air UK
06 Sep - 01 Oct	Wizz Air UK
01 Sep - 01 Oct	Wizz Air UK
05 Sep - 20 Sep	Wizz Air UK
02 Sep - 30 Sep	Wizz Air UK
05 Sep - 14 Sep	Wizz Air UK
06 Sep - 20 Sep	Wizz Air
05 Sep - 26 Sep	Wizz Air UK
10 Sep - 24 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 553€

Return flights