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

Return flights

30 Dec - 26 Jan	KLM
31 Dec - 12 Jan	Finnair
30 Dec - 19 Jan	KLM
27 Dec - 16 Jan	Turkish Airlines
30 Dec - 13 Jan	KLM
31 Dec - 19 Jan	Lufthansa
28 Dec - 18 Jan	Vueling Airlines
30 Dec - 18 Jan	SWISS
30 Dec - 17 Jan	SWISS
31 Dec - 14 Jan	Virgin Atlantic
28 Dec - 31 Dec	Vueling Airlines
27 Dec - 31 Dec	Vueling Airlines
29 Dec - 31 Dec	Aeromexico	direct
28 Dec - 31 Dec	Aeromexico	direct
27 Dec - 31 Dec	Aeromexico	direct
28 Dec - 30 Dec	Aeromexico
28 Dec - 29 Dec	Lufthansa
28 Dec - 30 Dec	Aeromexico	direct
28 Dec - 29 Dec	Aeromexico	direct

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 879€

Return flights