AirHint found the following cheapest return flights from Chiang Mai (CNX) to London (LGW) in December 2025 (see full year).

Return flights

16 Dec - 06 Jan	Thai Lion Air
17 Dec - 06 Jan	Thai VietJet Air
15 Dec - 15 Jan	China Eastern
24 Dec - 13 Jan	Thai VietJet Air
25 Dec - 13 Jan	Thai VietJet Air
24 Dec - 31 Dec	China Eastern
15 Dec - 30 Dec	Thai VietJet Air
01 Dec - 31 Dec	Thai VietJet Air
08 Dec - 08 Jan	Nok Air
07 Dec - 08 Jan	Thai AirAsia
03 Dec - 30 Dec	Thai AirAsia
07 Dec - 30 Dec	Thai VietJet Air
11 Dec - 09 Jan	China Southern
04 Dec - 30 Dec	Thai VietJet Air
08 Dec - 10 Dec	Thai VietJet Air
14 Dec - 02 Jan	British Airways
12 Dec - 03 Jan	British Airways
15 Dec - 20 Dec	Qatar Airways

Also check the deals for one-way flights from Chiang Mai 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.

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Cheapest return flights from Chiang Mai to London in December from $583

Return flights