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

Return flights

31 Dec - 20 Jan	British Airways
31 Dec - 26 Jan	British Airways
24 Dec - 20 Jan	Volaris
02 Dec - 11 Dec	Iberia
01 Dec - 09 Dec	Flair Airlines
02 Dec - 05 Dec	Iberia
02 Dec - 09 Dec	Iberia
24 Dec - 31 Dec	Aeromexico	direct
25 Dec - 19 Jan	Virgin Atlantic
15 Dec - 26 Jan	Volaris
24 Dec - 10 Jan	Aeromexico	direct
01 Dec - 12 Dec	British Airways
02 Dec - 05 Dec	Aeromexico	direct
25 Dec - 18 Jan	Virgin Atlantic
10 Dec - 31 Dec	Virgin Atlantic
08 Dec - 01 Jan	British Airways
04 Dec - 07 Dec	Iberia
04 Dec - 07 Dec	Aeromexico	direct
25 Dec - 01 Jan	Delta
11 Dec - 12 Jan	Delta

Also check the deals for one-way flights from Mexico City 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 Mexico City to London in December from 662€

Return flights