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

Return flights

23 Sep - 06 Oct	easyJet
22 Sep - 28 Sep	easyJet
22 Sep - 06 Oct	easyJet
26 Sep - 04 Oct	Ryanair
29 Sep - 17 Oct	Ryanair
26 Sep - 17 Oct	Ryanair
23 Sep - 28 Sep	Ryanair
26 Sep - 19 Oct	Ryanair
22 Sep - 31 Oct	easyJet
22 Sep - 30 Sep	easyJet
30 Sep - 07 Oct	easyJet
26 Sep - 11 Oct	Ryanair
26 Sep - 03 Oct	Ryanair
22 Sep - 24 Sep	easyJet
23 Sep - 30 Sep	easyJet
22 Sep - 29 Sep	easyJet
23 Sep - 26 Sep	easyJet
22 Sep - 25 Sep	easyJet
27 Sep - 30 Sep	Ryanair
26 Sep - 29 Sep	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 612€

Return flights