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

Return flights

01 Dec - 18 Dec	Virgin Atlantic
09 Dec - 23 Dec	Delta
05 Dec - 09 Dec	KLM
31 Dec - 13 Jan	Delta
03 Dec - 13 Dec	SWISS
03 Dec - 16 Dec	SWISS
31 Dec - 08 Jan	Delta
04 Dec - 11 Dec	Lufthansa
05 Dec - 11 Dec	SWISS
31 Dec - 14 Jan	Lufthansa
10 Dec - 18 Dec	SWISS
10 Dec - 15 Jan	SWISS
05 Dec - 20 Dec	SWISS
01 Dec - 11 Dec	SWISS
29 Dec - 13 Jan	SWISS
31 Dec - 17 Jan	SWISS
30 Dec - 13 Jan	SWISS
30 Dec - 17 Jan	SWISS
09 Dec - 14 Jan	Lufthansa
31 Dec - 12 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 $662

Return flights