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

Return flights

06 Dec - 13 Dec	Spirit Airlines
09 Dec - 19 Jan	Air Canada
25 Dec - 11 Jan	jetBlue
25 Dec - 08 Jan	jetBlue
13 Dec - 10 Jan	Spirit Airlines
27 Dec - 07 Jan	TAP
25 Dec - 25 Jan	KLM
04 Dec - 07 Jan	TAP
11 Dec - 11 Jan	Spirit Airlines
05 Dec - 16 Jan	WestJet
31 Dec - 18 Jan	Aeromexico
08 Dec - 15 Dec	Air Canada
09 Dec - 16 Dec	TAP
13 Dec - 14 Dec	Spirit Airlines
10 Dec - 23 Dec	Air Canada
23 Dec - 31 Dec	Air Canada
24 Dec - 31 Dec	Air Canada
25 Dec - 31 Dec	Aeromexico
26 Dec - 31 Dec	jetBlue
12 Dec - 29 Dec	Spirit Airlines

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 712€

Return flights