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

Return flights

03 Dec - 15 Dec	SWISS
01 Dec - 22 Dec	SWISS
04 Dec - 09 Dec	Air Canada
04 Dec - 11 Dec	SWISS
08 Dec - 14 Dec	Virgin Atlantic
04 Dec - 10 Dec	SWISS
02 Dec - 23 Dec	KLM
03 Dec - 07 Dec	Virgin Atlantic	direct
06 Dec - 13 Dec	Air Canada
07 Dec - 10 Dec	Virgin Atlantic	direct
31 Dec - 10 Jan	Lufthansa
31 Dec - 11 Jan	Virgin Atlantic	direct
29 Dec - 22 Jan	Lufthansa
29 Dec - 18 Jan	Lufthansa
29 Dec - 17 Jan	Lufthansa
09 Dec - 07 Jan	British Airways
11 Dec - 11 Jan	British Airways
30 Dec - 17 Jan	Delta
30 Dec - 24 Jan	Delta
10 Dec - 07 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 $685

Return flights