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

Return flights

31 Dec - 12 Jan	Aeromexico
31 Dec - 26 Jan	Aeromexico
31 Dec - 13 Jan	Aeromexico
31 Dec - 14 Jan	Aeromexico
31 Dec - 08 Jan	Avianca
31 Dec - 26 Jan	British Airways	direct
26 Dec - 24 Jan	Viva
26 Dec - 12 Jan	Viva
30 Dec - 31 Jan	Air France
27 Dec - 25 Jan	Avianca
26 Dec - 30 Dec	Avianca
26 Dec - 30 Dec	Aeromexico	direct

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 $977

Return flights