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

Return flights

01 Dec - 08 Dec	WestJet
01 Dec - 10 Dec	WestJet
02 Dec - 06 Dec	WestJet
11 Dec - 11 Jan	Spirit Airlines
04 Dec - 11 Dec	TAP
14 Dec - 11 Jan	jetBlue
31 Dec - 23 Jan	Air France
30 Dec - 08 Jan	TAP
01 Dec - 15 Dec	WORLD2FLY
24 Dec - 15 Jan	WestJet
29 Dec - 21 Jan	Air France
12 Dec - 16 Dec	TAP
25 Dec - 15 Jan	WestJet
30 Dec - 10 Jan	WORLD2FLY
27 Dec - 10 Jan	TUI.nl
26 Dec - 16 Jan	Iberojet
06 Dec - 07 Dec	Delta
15 Dec - 25 Dec	Delta
17 Dec - 24 Dec	Delta
26 Dec - 31 Dec	TAP

Also check the deals for one-way flights from Cancun to London 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 Cancun to London in December from $854

Return flights