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

Return flights

02 Dec - 10 Dec	Aeromexico	direct
02 Dec - 11 Dec	Aeromexico	direct
01 Dec - 09 Dec	Aeromexico	direct
01 Dec - 08 Dec	Air Canada
01 Dec - 08 Dec	Aeromexico	direct
01 Dec - 12 Dec	Air Canada
31 Dec - 26 Jan	Aeromexico
08 Dec - 31 Dec	Air Canada
30 Dec - 13 Jan	Lufthansa
01 Dec - 12 Dec	Aeromexico	direct
07 Dec - 15 Dec	Air Canada
01 Dec - 13 Dec	Air Canada
24 Dec - 01 Jan	Air Canada
26 Dec - 15 Jan	Lufthansa
31 Dec - 26 Jan	Aeromexico	direct
14 Dec - 01 Jan	Air Canada
16 Dec - 01 Jan	Air Canada
25 Dec - 07 Jan	Air Canada
25 Dec - 06 Jan	Air Canada
13 Dec - 06 Jan	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 $852

Return flights