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

Return flights

05 Dec - 08 Jan	Air Canada
05 Dec - 09 Jan	Air Canada
10 Dec - 16 Jan	Air Canada
10 Dec - 24 Dec	SWISS
06 Dec - 10 Dec	SWISS
03 Dec - 09 Dec	SWISS
10 Dec - 12 Jan	SWISS
03 Dec - 08 Jan	SWISS
06 Dec - 08 Jan	SWISS
08 Dec - 08 Jan	SWISS
06 Dec - 07 Jan	SWISS
06 Dec - 15 Jan	SWISS
02 Dec - 09 Dec	SWISS
01 Dec - 10 Dec	SWISS
02 Dec - 10 Dec	SWISS
06 Dec - 24 Dec	SWISS
02 Dec - 31 Jan	SWISS
02 Dec - 23 Dec	SWISS
10 Dec - 23 Dec	SWISS
02 Dec - 11 Dec	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 506€

Return flights