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

Return flights

22 Sep - 03 Oct	Delta
26 Sep - 31 Oct	Frontier Airlines
26 Sep - 30 Sep	Frontier Airlines
24 Sep - 30 Sep	Frontier Airlines
25 Sep - 29 Sep	Frontier Airlines
26 Sep - 03 Oct	Frontier Airlines
22 Sep - 29 Sep	Frontier Airlines
23 Sep - 30 Sep	Frontier Airlines
24 Sep - 01 Oct	Frontier Airlines
21 Sep - 30 Sep	Frontier Airlines
20 Sep - 27 Sep	Frontier Airlines
18 Sep - 22 Sep	Frontier Airlines
20 Sep - 30 Sep	Frontier Airlines
19 Sep - 28 Sep	Frontier Airlines

Also check the deals for one-way flights from Phoenix 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 Phoenix to Dublin in September from 549€

Return flights