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

Return flights

03 Dec - 17 Dec	Virgin Atlantic	direct
01 Dec - 10 Dec	Virgin Atlantic
04 Dec - 08 Dec	SWISS
03 Dec - 08 Dec	SWISS
03 Dec - 11 Dec	SWISS
04 Dec - 12 Dec	SWISS
04 Dec - 09 Dec	SWISS
01 Dec - 12 Dec	SWISS
03 Dec - 07 Dec	SWISS
02 Dec - 08 Dec	SWISS
31 Dec - 14 Jan	SWISS
31 Dec - 17 Jan	SWISS
10 Dec - 24 Jan	Lufthansa
10 Dec - 15 Jan	Lufthansa
10 Dec - 31 Jan	Lufthansa
11 Dec - 25 Jan	SWISS
11 Dec - 16 Jan	Air Canada
11 Dec - 14 Jan	Air Canada
31 Dec - 08 Jan	SWISS
31 Dec - 10 Jan	SWISS

Also check the deals for one-way flights from London to Cancun 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 Cancun in December from 477€

Return flights