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

Return flights

08 Sep - 21 Sep	easyJet
09 Sep - 17 Sep	Ryanair
03 Sep - 18 Sep	easyJet
04 Sep - 17 Sep	easyJet
30 Sep - 10 Oct	Ryanair
28 Sep - 05 Oct	easyJet
23 Sep - 02 Oct	easyJet
21 Sep - 28 Sep	easyJet
30 Sep - 11 Oct	Ryanair
07 Sep - 28 Sep	easyJet
26 Sep - 05 Oct	easyJet
01 Sep - 07 Sep	easyJet
06 Sep - 12 Sep	easyJet
28 Sep - 04 Oct	easyJet
22 Sep - 30 Sep	easyJet
07 Sep - 17 Sep	easyJet
25 Sep - 10 Oct	Ryanair
22 Sep - 06 Oct	Ryanair
27 Sep - 10 Oct	Ryanair
27 Sep - 17 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 702€

Return flights