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

Return flights

03 Dec - 10 Dec	Lufthansa
03 Dec - 14 Jan	Lufthansa
02 Dec - 08 Dec	Lufthansa
08 Dec - 14 Jan	British Airways
01 Dec - 08 Dec	SWISS
04 Dec - 07 Dec	Lufthansa
02 Dec - 14 Dec	Lufthansa
06 Dec - 14 Jan	British Airways
04 Dec - 29 Dec	Lufthansa
01 Dec - 14 Dec	Lufthansa
01 Dec - 07 Dec	SWISS
05 Dec - 14 Dec	Lufthansa
01 Dec - 28 Dec	Lufthansa
31 Dec - 29 Jan	British Airways
08 Dec - 13 Jan	British Airways
31 Dec - 22 Jan	British Airways
05 Dec - 11 Jan	Lufthansa
05 Dec - 29 Jan	British Airways
15 Dec - 14 Jan	British Airways
04 Dec - 10 Jan	Iberia

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 645€

Return flights