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

Return flights

30 Dec - 17 Jan	Air Canada
29 Dec - 12 Jan	Air Canada
30 Dec - 18 Jan	Air Canada
27 Dec - 13 Jan	Air Canada
30 Dec - 15 Jan	Lufthansa
29 Dec - 20 Jan	Air France
29 Dec - 15 Jan	Air Canada
29 Dec - 14 Jan	Air Canada
29 Dec - 08 Jan	Lufthansa
28 Dec - 14 Jan	SWISS
27 Dec - 29 Dec	Lufthansa
27 Dec - 30 Dec	Lufthansa
27 Dec - 31 Dec	Lufthansa
29 Dec - 31 Dec	Air France
28 Dec - 29 Dec	TAP
29 Dec - 29 Dec	Iberia

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.

Book a cheap hotel in Cancun

Cheap car rent in Cancun

Cheapest return flights from London to Cancun in December from 684€

Return flights