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

Return flights

09 Sep - 21 Sep	Ryanair
09 Sep - 15 Sep	Ryanair
07 Sep - 08 Oct	Ryanair
06 Sep - 09 Sep	Ryanair
10 Sep - 15 Sep	Ryanair
11 Sep - 15 Oct	Ryanair
11 Sep - 21 Sep	Ryanair
08 Sep - 15 Sep	Ryanair
06 Sep - 15 Sep	Ryanair
24 Sep - 28 Sep	Ryanair
02 Sep - 15 Oct	Ryanair
24 Sep - 03 Oct	Ryanair
17 Sep - 08 Oct	Ryanair
13 Sep - 21 Sep	Ryanair
14 Sep - 28 Sep	Ryanair
17 Sep - 09 Oct	Ryanair
17 Sep - 01 Oct	Ryanair
24 Sep - 15 Oct	Ryanair
27 Sep - 01 Oct	easyJet
30 Sep - 07 Oct	easyJet

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 $687

Return flights