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

Return flights

20 Dec - 05 Jan	Thai AirAsia
16 Dec - 06 Jan	Thai Lion Air
18 Dec - 04 Jan	Thai Lion Air
19 Dec - 05 Jan	Thai AirAsia
30 Dec - 16 Jan	Thai Lion Air
30 Dec - 14 Jan	Thai Lion Air
19 Dec - 04 Jan	Thai AirAsia
24 Dec - 13 Jan	Thai AirAsia
20 Dec - 03 Jan	Thai AirAsia X
02 Dec - 05 Jan	Thai AirAsia
20 Dec - 31 Dec	Thai AirAsia X
02 Dec - 26 Dec	Thai Lion Air
17 Dec - 31 Dec	Thai AirAsia
16 Dec - 30 Dec	Thai Lion Air
10 Dec - 31 Dec	Thai AirAsia
23 Dec - 29 Dec	Thai AirAsia X
09 Dec - 27 Dec	Thai Lion Air
03 Dec - 09 Dec	AirAsia
05 Dec - 08 Dec	AirAsia
13 Dec - 30 Dec	Thai AirAsia

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

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

Cheapest return flights from Bangkok to London in December from 537€

Return flights