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

Return flights

06 Dec - 17 Jan	Viva
13 Dec - 15 Jan	Viva
14 Dec - 15 Jan	Volaris
03 Dec - 10 Dec	Volaris
03 Dec - 14 Jan	Volaris
07 Dec - 16 Jan	Volaris
11 Dec - 08 Jan	Volaris
10 Dec - 10 Jan	Viva
05 Dec - 10 Jan	Volaris
04 Dec - 14 Jan	Volaris
15 Dec - 15 Jan	Volaris
02 Dec - 09 Dec	Volaris
03 Dec - 08 Dec	Volaris
02 Dec - 11 Dec	Viva
05 Dec - 14 Dec	Viva
03 Dec - 27 Dec	Volaris
06 Dec - 12 Dec	Volaris
01 Dec - 10 Dec	Volaris
02 Dec - 07 Dec	Aer Lingus
06 Dec - 13 Dec	Volaris

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 $648

Return flights