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

Return flights

10 Dec - 25 Dec	KLM
03 Dec - 09 Dec	KLM
01 Dec - 18 Dec	KLM
31 Dec - 13 Jan	KLM
10 Dec - 13 Jan	KLM
05 Dec - 18 Dec	KLM
31 Dec - 17 Jan	KLM
03 Dec - 11 Dec	SWISS
03 Dec - 10 Dec	Lufthansa
01 Dec - 10 Dec	Lufthansa
02 Dec - 09 Dec	KLM
04 Dec - 10 Dec	Lufthansa
09 Dec - 16 Dec	KLM
29 Dec - 22 Jan	KLM
29 Dec - 13 Jan	KLM
31 Dec - 08 Jan	Delta
31 Dec - 21 Jan	Lufthansa
31 Dec - 14 Jan	Lufthansa
31 Dec - 11 Jan	KLM
30 Dec - 08 Jan	KLM

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 549€

Return flights