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

Return flights

10 Dec - 21 Jan	Volaris
02 Dec - 27 Jan	Avianca
03 Dec - 11 Jan	Viva
30 Dec - 13 Jan	Volaris
11 Dec - 27 Jan	Avianca
30 Dec - 15 Jan	Volaris
16 Dec - 22 Jan	Viva
23 Dec - 22 Jan	Viva
08 Dec - 30 Dec	WestJet
30 Dec - 10 Jan	Volaris
08 Dec - 31 Dec	WestJet
02 Dec - 09 Dec	Volaris
10 Dec - 09 Jan	Viva
08 Dec - 26 Dec	WestJet
04 Dec - 06 Dec	Volaris
02 Dec - 04 Dec	Virgin Atlantic
04 Dec - 11 Dec	Iberia
04 Dec - 08 Dec	Avianca
03 Dec - 12 Dec	Finnair
15 Dec - 24 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.

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Cheapest return flights from Mexico City to London in December from 727€

Return flights