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

Return flights

28 Dec - 13 Jan	American Airlines
28 Dec - 21 Jan	American Airlines
28 Dec - 28 Jan	American Airlines
31 Dec - 21 Jan	Virgin Atlantic	direct
30 Dec - 14 Jan	Virgin Atlantic
30 Dec - 13 Jan	Virgin Atlantic
28 Dec - 16 Jan	American Airlines
31 Dec - 14 Jan	Virgin Atlantic
30 Dec - 23 Jan	Virgin Atlantic
27 Dec - 18 Jan	Finnair
26 Dec - 28 Dec	Lufthansa
26 Dec - 29 Dec	Air Canada
26 Dec - 31 Dec	Lufthansa
27 Dec - 31 Dec	Finnair
24 Dec - 30 Dec	TAP
27 Dec - 30 Dec	Lufthansa
23 Dec - 30 Dec	TAP
24 Dec - 28 Dec	Air Europa
25 Dec - 30 Dec	Air Europa
22 Dec - 29 Dec	Wizz Air Malta

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 610€

Return flights