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

Return flights

15 Sep - 22 Sep	Spirit Airlines
16 Sep - 23 Sep	Spirit Airlines
17 Sep - 25 Sep	Spirit Airlines
28 Sep - 07 Oct	Spirit Airlines
04 Sep - 15 Sep	jetBlue
12 Sep - 15 Sep	jetBlue
13 Sep - 16 Sep	jetBlue
21 Sep - 30 Sep	Spirit Airlines
05 Sep - 12 Sep	Frontier Airlines
20 Sep - 27 Sep	jetBlue
29 Sep - 25 Oct	Spirit Airlines
30 Sep - 25 Oct	Spirit Airlines
26 Sep - 04 Oct	Spirit Airlines
25 Sep - 06 Oct	Icelandair
08 Sep - 15 Sep	Air France	direct

Also check the deals for one-way flights from Detroit 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 Detroit to Dublin in September from $485

Return flights