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

Return flights

31 Dec - 21 Jan	British Airways
31 Dec - 20 Jan	British Airways
30 Dec - 21 Jan	British Airways
30 Dec - 14 Jan	Finnair
31 Dec - 26 Jan	British Airways
28 Dec - 20 Jan	Volaris
30 Dec - 21 Jan	Aeromexico	direct
31 Dec - 26 Jan	Aeromexico	direct
03 Dec - 11 Dec	Finnair
31 Dec - 14 Jan	Finnair
02 Dec - 09 Dec	British Airways
03 Dec - 31 Dec	Finnair
24 Dec - 09 Jan	Volaris
06 Dec - 13 Dec	Finnair
04 Dec - 12 Dec	Finnair
03 Dec - 09 Dec	British Airways
03 Dec - 31 Dec	Aeromexico	direct
04 Dec - 14 Dec	Finnair
01 Dec - 31 Dec	Iberia
01 Dec - 16 Dec	Finnair

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Mexico City to London in December from 756€

Return flights