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	SWISS
01 Dec - 09 Dec	Lufthansa
01 Dec - 24 Dec	Lufthansa
03 Dec - 15 Jan	Lufthansa
03 Dec - 14 Jan	Lufthansa
03 Dec - 10 Dec	Lufthansa
02 Dec - 16 Dec	Lufthansa
03 Dec - 13 Dec	Lufthansa
03 Dec - 13 Jan	Lufthansa
03 Dec - 11 Dec	Lufthansa
02 Dec - 17 Jan	Air Canada
04 Dec - 23 Dec	Lufthansa
01 Dec - 15 Dec	Air Canada
10 Dec - 24 Dec	Air Canada
30 Dec - 16 Jan	Air Canada
31 Dec - 14 Jan	Air Canada
31 Dec - 31 Jan	Air Canada
31 Dec - 24 Jan	Air Canada
30 Dec - 13 Jan	Air Canada
24 Dec - 21 Jan	Air Canada

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 $715

Return flights