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

Return flights

01 Dec - 08 Dec	Lufthansa
02 Dec - 10 Dec	Virgin Atlantic
02 Dec - 11 Dec	Lufthansa
09 Dec - 23 Dec	SWISS
03 Dec - 14 Dec	Lufthansa
03 Dec - 13 Dec	Virgin Atlantic
09 Dec - 16 Dec	KLM
01 Dec - 07 Dec	Lufthansa
08 Dec - 15 Dec	Lufthansa
30 Dec - 15 Jan	KLM
31 Dec - 18 Jan	KLM
17 Dec - 07 Jan	Iberia
17 Dec - 08 Jan	Iberia
01 Dec - 14 Dec	Lufthansa
31 Dec - 14 Jan	Lufthansa
08 Dec - 15 Jan	Lufthansa
30 Dec - 13 Jan	Virgin Atlantic
29 Dec - 13 Jan	Delta
29 Dec - 15 Jan	Delta
30 Dec - 09 Jan	British Airways

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 677€

Return flights