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

Return flights

08 Dec - 18 Dec	Lufthansa
07 Dec - 18 Dec	Lufthansa
03 Dec - 10 Dec	Air Canada
04 Dec - 09 Dec	Air Canada
02 Dec - 09 Dec	Air Canada
03 Dec - 11 Dec	SWISS
03 Dec - 09 Dec	SWISS
03 Dec - 10 Dec	Virgin Atlantic	direct
04 Dec - 17 Jan	Air Canada
01 Dec - 07 Dec	Air Canada
07 Dec - 14 Dec	Lufthansa
31 Dec - 21 Jan	Virgin Atlantic	direct
06 Dec - 14 Jan	Air Canada
31 Dec - 13 Jan	Air Canada
31 Dec - 12 Jan	Air Canada
30 Dec - 25 Jan	Air Canada
30 Dec - 12 Jan	Air Canada
30 Dec - 13 Jan	Air Canada
10 Dec - 07 Jan	Lufthansa
31 Dec - 11 Jan	Air Canada

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 $595

Return flights