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

Return flights

04 Dec - 22 Jan	Viva
03 Dec - 10 Dec	British Airways
31 Dec - 20 Jan	British Airways
01 Dec - 06 Dec	Flair Airlines
02 Dec - 11 Dec	Iberia
02 Dec - 10 Dec	Iberia
10 Dec - 16 Jan	British Airways
31 Dec - 20 Jan	Aeromexico	direct
02 Dec - 09 Dec	Iberia
04 Dec - 21 Jan	Aeromexico	direct
04 Dec - 22 Jan	Aeromexico	direct
31 Dec - 15 Jan	Aeromexico	direct
02 Dec - 09 Dec	Aeromexico	direct
07 Dec - 09 Dec	Viva
01 Dec - 08 Dec	Aeromexico	direct
11 Dec - 14 Jan	Viva
24 Dec - 17 Jan	Aeromexico	direct
31 Dec - 14 Jan	Aeromexico	direct
08 Dec - 15 Dec	Flair Airlines
02 Dec - 07 Dec	Aeromexico	direct

Also check the deals for one-way flights from Mexico City to London 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 Mexico City to London in December from $756

Return flights