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

Return flights

16 Sep - 30 Sep	easyJet
23 Sep - 30 Sep	easyJet
24 Sep - 01 Oct	easyJet
15 Sep - 17 Sep	Ryanair
22 Sep - 29 Sep	easyJet
15 Sep - 22 Sep	easyJet
14 Sep - 28 Sep	easyJet
23 Sep - 29 Sep	easyJet
14 Sep - 21 Sep	easyJet
15 Sep - 19 Sep	easyJet
18 Sep - 30 Sep	Jet2
29 Sep - 03 Oct	Wizz Air UK
30 Sep - 07 Oct	easyJet
20 Sep - 01 Oct	Ryanair
18 Sep - 02 Oct	easyJet
28 Sep - 08 Oct	easyJet
26 Sep - 04 Oct	easyJet
15 Sep - 02 Oct	easyJet
20 Sep - 20 Oct	easyJet
27 Sep - 04 Oct	Ryanair

Also check the deals for one-way flights from London to Cancun in September.

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 September from $750

Return flights