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

Return flights

08 Sep - 22 Sep	jetBlue
08 Sep - 15 Sep	jetBlue
07 Sep - 22 Sep	Frontier Airlines
29 Sep - 20 Oct	Delta
30 Sep - 20 Oct	Delta
29 Sep - 21 Oct	Delta
28 Sep - 20 Oct	Delta
08 Sep - 29 Sep	Delta
26 Sep - 20 Oct	Delta
13 Sep - 27 Sep	jetBlue
22 Sep - 01 Oct	KLM
15 Sep - 01 Oct	Air France
24 Sep - 01 Oct	British Airways

Also check the deals for one-way flights from Cancun to Dublin 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 Cancun to Dublin in September from 683€

Return flights