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

Return flights

10 Sep - 17 Sep	Thai Lion Air
23 Sep - 09 Oct	Scoot
25 Sep - 02 Oct	Oman Air
12 Sep - 20 Sep	Oman Air
09 Sep - 24 Sep	Etihad Airways
12 Sep - 19 Sep	Oman Air
12 Sep - 13 Sep	Oman Air
09 Sep - 13 Sep	Kuwait Airways
15 Sep - 07 Oct	Kuwait Airways
25 Sep - 09 Oct	Kuwait Airways
01 Sep - 11 Sep	Thai Lion Air
12 Sep - 12 Sep	Etihad Airways
08 Sep - 15 Oct	Kuwait Airways
10 Sep - 10 Sep	Etihad Airways
09 Sep - 16 Sep	Etihad Airways
30 Sep - 21 Oct	Kuwait Airways
29 Sep - 27 Oct	Etihad Airways
17 Sep - 14 Oct	Etihad Airways
16 Sep - 08 Oct	Etihad Airways
28 Sep - 12 Oct	Etihad Airways

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 611€

Return flights