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

Return flights

05 Sep - 12 Sep	Thai VietJet Air
14 Sep - 30 Sep	Thai AirAsia X
07 Sep - 14 Sep	Thai VietJet Air
22 Sep - 29 Sep	China Eastern
03 Sep - 21 Sep	SriLankan Airlines
02 Sep - 07 Oct	Kuwait Airways
09 Sep - 07 Oct	Kuwait Airways
17 Sep - 30 Sep	Saudia
19 Sep - 27 Sep	Air Astana
17 Sep - 10 Oct	Emirates
20 Sep - 01 Oct	SWISS
26 Sep - 03 Oct	SWISS
22 Sep - 29 Sep	EVA Air	direct
19 Sep - 27 Sep	EVA Air	direct
17 Sep - 10 Oct	EVA Air	direct
14 Sep - 30 Sep	EVA Air	direct
09 Sep - 07 Oct	EVA Air	direct
26 Sep - 03 Oct	EVA Air	direct
20 Sep - 01 Oct	EVA Air	direct
02 Sep - 07 Oct	EVA Air	direct

Also check the deals for one-way flights from Bangkok to London 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 Bangkok to London in September from 658€

Return flights