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

Return flights

03 Dec - 16 Dec	SWISS
04 Dec - 08 Dec	SWISS
01 Dec - 06 Dec	SWISS
04 Dec - 13 Dec	SWISS
01 Dec - 13 Dec	SWISS
01 Dec - 08 Dec	SWISS
09 Dec - 12 Dec	SWISS
02 Dec - 08 Dec	SWISS
04 Dec - 12 Dec	SWISS
09 Dec - 14 Dec	SWISS
31 Dec - 14 Jan	Air Canada
31 Dec - 14 Jan	Virgin Atlantic	direct
31 Dec - 12 Jan	Air Canada
30 Dec - 13 Jan	American Airlines
09 Dec - 07 Jan	SWISS
31 Dec - 11 Jan	Virgin Atlantic	direct
15 Dec - 12 Jan	Air Canada
31 Dec - 10 Jan	Lufthansa
31 Dec - 07 Jan	Lufthansa
16 Dec - 21 Jan	Lufthansa

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 564€

Return flights