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

Return flights

10 Sep - 26 Sep	Ryanair
10 Sep - 29 Sep	Ryanair
13 Sep - 16 Sep	Ryanair
11 Sep - 26 Sep	Ryanair
29 Sep - 13 Oct	Ryanair
10 Sep - 25 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
10 Sep - 05 Oct	Ryanair
10 Sep - 24 Sep	Ryanair
14 Sep - 26 Sep	Ryanair
11 Sep - 11 Oct	Ryanair
10 Sep - 19 Sep	Ryanair
21 Sep - 02 Oct	Ryanair
10 Sep - 27 Sep	Ryanair
25 Sep - 02 Oct	Ryanair
15 Sep - 02 Oct	Ryanair
20 Sep - 01 Oct	Ryanair
19 Sep - 03 Oct	Ryanair
25 Sep - 06 Oct	Ryanair
27 Sep - 18 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 587€

Return flights