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

Return flights

01 Dec - 10 Dec	Air Canada
03 Dec - 10 Dec	Lufthansa
01 Dec - 08 Dec	Lufthansa
09 Dec - 12 Jan	Air Canada
02 Dec - 09 Dec	Air France
01 Dec - 23 Dec	Lufthansa
04 Dec - 08 Dec	Air Canada
02 Dec - 09 Dec	Aeromexico	direct
02 Dec - 10 Dec	Aeromexico	direct
31 Dec - 13 Jan	Aeromexico	direct
31 Dec - 14 Jan	Aeromexico	direct
31 Dec - 15 Jan	Aeromexico	direct
01 Dec - 15 Dec	Lufthansa
03 Dec - 10 Dec	Aeromexico	direct
11 Dec - 17 Jan	Air Canada
06 Dec - 18 Jan	Air Canada
09 Dec - 12 Jan	Aeromexico	direct
27 Dec - 17 Jan	Lufthansa
27 Dec - 24 Jan	Lufthansa
28 Dec - 20 Jan	Lufthansa

Also check the deals for one-way flights from London to Mexico City 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 London to Mexico City in December from 602€

Return flights