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

Return flights

15 Oct - 24 Oct	Aegean Airlines
17 Oct - 24 Oct	Brussels Airlines
01 Oct - 25 Nov	Air China
01 Oct - 26 Nov	Air China
04 Oct - 05 Nov	Air China
21 Oct - 19 Nov	Air China
29 Oct - 26 Nov	Air China
04 Oct - 18 Oct	Air China
02 Oct - 23 Oct	Air China
02 Oct - 24 Oct	Air China
03 Oct - 26 Oct	Air China
02 Oct - 13 Oct	Air China
02 Oct - 17 Oct	Air China
02 Oct - 11 Oct	Air China
01 Oct - 19 Oct	Air China
28 Oct - 07 Nov	Air China
28 Oct - 05 Nov	Air China
28 Oct - 14 Nov	Air China
30 Oct - 12 Nov	Air China
28 Oct - 10 Nov	Air China

Also check the deals for one-way flights from London to Bangkok in October.

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 October from 421€

Return flights