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

Return flights

24 Dec - 24 Jan	Aeromexico
23 Dec - 22 Jan	Avianca
24 Dec - 16 Jan	Aeromexico
24 Dec - 15 Jan	Aeromexico
31 Dec - 13 Jan	Volaris
31 Dec - 26 Jan	Virgin Atlantic
24 Dec - 09 Jan	Aeromexico
31 Dec - 17 Jan	Volaris
31 Dec - 15 Jan	Delta
30 Dec - 31 Jan	British Airways
23 Dec - 31 Dec	Volaris
24 Dec - 31 Dec	Aeromexico
23 Dec - 30 Dec	Volaris
24 Dec - 31 Dec	Aeromexico	direct
25 Dec - 30 Dec	Avianca
23 Dec - 24 Dec	Avianca
22 Dec - 26 Dec	Avianca
22 Dec - 30 Dec	Avianca
23 Dec - 29 Dec	Avianca
20 Dec - 30 Dec	Air Canada

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 774€

Return flights