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

Return flights

02 Dec - 10 Dec	Lufthansa
04 Dec - 11 Dec	Lufthansa
08 Dec - 23 Dec	Lufthansa
11 Dec - 13 Jan	Air Canada
03 Dec - 17 Dec	Air France
06 Dec - 24 Dec	Air Canada
10 Dec - 16 Jan	Air Canada
01 Dec - 08 Dec	SWISS
03 Dec - 29 Dec	Virgin Atlantic
31 Dec - 14 Jan	Virgin Atlantic
07 Dec - 22 Dec	Virgin Atlantic
08 Dec - 15 Dec	British Airways
03 Dec - 16 Dec	British Airways
31 Dec - 13 Jan	Virgin Atlantic
29 Dec - 15 Jan	Delta
31 Dec - 08 Jan	Delta
31 Dec - 14 Jan	Aeromexico	direct
31 Dec - 15 Jan	Aeromexico	direct
31 Dec - 13 Jan	Aeromexico	direct
27 Dec - 14 Jan	Virgin Atlantic

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 $747

Return flights