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

Return flights

01 Sep - 22 Sep	Etihad Airways
03 Sep - 02 Oct	Etihad Airways
01 Sep - 17 Sep	Etihad Airways
22 Sep - 25 Oct	Air China
06 Sep - 15 Oct	Air China
23 Sep - 21 Oct	Air China
07 Sep - 17 Sep	Etihad Airways
07 Sep - 16 Sep	Etihad Airways
01 Sep - 15 Sep	Etihad Airways
01 Sep - 30 Sep	Etihad Airways
01 Sep - 29 Sep	Etihad Airways
19 Sep - 03 Oct	Air China
01 Sep - 01 Oct	Etihad Airways
18 Sep - 09 Oct	Air China
01 Sep - 14 Sep	Etihad Airways
01 Sep - 16 Sep	Etihad Airways
01 Sep - 12 Sep	Etihad Airways
23 Sep - 02 Oct	Air China
18 Sep - 02 Oct	Air China
16 Sep - 02 Oct	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 500€

Return flights