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	Air Canada
01 Dec - 14 Dec	Air Canada
03 Dec - 14 Dec	Air Canada
01 Dec - 15 Dec	Air Canada
01 Dec - 10 Dec	Air Canada
05 Dec - 14 Dec	Air Canada
04 Dec - 15 Jan	Air Canada
11 Dec - 15 Jan	Air Canada
02 Dec - 09 Dec	Air Canada
01 Dec - 15 Dec	British Airways	direct
02 Dec - 09 Dec	Aeromexico	direct
02 Dec - 10 Dec	Aeromexico	direct
29 Dec - 14 Jan	Delta
29 Dec - 19 Jan	Delta
25 Dec - 15 Jan	Virgin Atlantic
31 Dec - 10 Jan	Virgin Atlantic
29 Dec - 08 Jan	Delta
30 Dec - 17 Jan	British Airways
30 Dec - 22 Jan	United
29 Dec - 30 Jan	United

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 $740

Return flights