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

Return flights

26 Dec - 15 Jan	Air China
29 Dec - 16 Jan	Air China
17 Dec - 31 Dec	Thai VietJet Air
30 Dec - 16 Jan	Nok Air
19 Dec - 02 Jan	Thai VietJet Air
17 Dec - 04 Jan	Thai VietJet Air
18 Dec - 04 Jan	Thai VietJet Air

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 657€

Return flights