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

Return flights

25 Dec - 26 Jan	Aeromexico	direct
25 Dec - 20 Jan	Aeromexico	direct
04 Dec - 11 Dec	British Airways
04 Dec - 09 Dec	British Airways
03 Dec - 09 Dec	British Airways
04 Dec - 10 Dec	British Airways
10 Dec - 15 Jan	British Airways
04 Dec - 14 Jan	British Airways
09 Dec - 14 Jan	British Airways
03 Dec - 14 Jan	British Airways
02 Dec - 09 Dec	Finnair
04 Dec - 15 Jan	Finnair
03 Dec - 13 Jan	Finnair
08 Dec - 15 Dec	Finnair
03 Dec - 17 Dec	Finnair
03 Dec - 15 Dec	Finnair
10 Dec - 15 Dec	Finnair
08 Dec - 16 Dec	Finnair
27 Dec - 28 Jan	Finnair
25 Dec - 23 Jan	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 743€

Return flights