Cheapest return flights from Bangkok to London in September from $752

Best time to book flights for Bangkok (BKK) to London (LHR) flights at AirHint

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

Return flights

30 Sep - 12 Oct Royal Brunei
17 Sep - 23 Sep KLM
18 Sep - 26 Sep KLM
09 Sep - 23 Sep Finnair
08 Sep - 19 Sep Finnair
08 Sep - 21 Sep Finnair
16 Sep - 22 Sep Finnair
10 Sep - 17 Sep Finnair
08 Sep - 15 Sep Finnair
02 Sep - 11 Sep Finnair
12 Sep - 22 Sep Finnair
26 Sep - 31 Oct Finnair
18 Sep - 12 Oct Finnair
28 Sep - 03 Oct Oman Air
09 Sep - 12 Oct Finnair
11 Sep - 16 Oct Finnair
26 Sep - 05 Oct Austrian Airlines
26 Sep - 04 Oct Austrian Airlines
04 Sep - 12 Oct Finnair
28 Sep - 03 Oct EVA Air direct

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

Skyscanner

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.

Book a cheap hotel in London

Cheap car rent in London