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

Return flights

29 Sep - 06 Oct	Frontier Airlines
16 Sep - 19 Sep	Frontier Airlines
13 Sep - 04 Oct	Spirit Airlines
23 Sep - 26 Sep	Spirit Airlines
25 Sep - 04 Oct	Spirit Airlines
16 Sep - 23 Sep	Frontier Airlines
25 Sep - 18 Oct	Spirit Airlines
12 Sep - 15 Sep	WestJet
19 Sep - 25 Sep	Frontier Airlines
12 Sep - 23 Sep	WestJet
12 Sep - 22 Sep	WestJet
11 Sep - 15 Sep	Frontier Airlines
12 Sep - 21 Sep	WestJet
11 Sep - 04 Oct	Frontier Airlines
12 Sep - 23 Sep	Air France	direct
13 Sep - 04 Oct	Delta	direct
11 Sep - 04 Oct	Air France	direct
29 Sep - 06 Oct	Delta	direct

Also check the deals for one-way flights from Atlanta 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 Atlanta to Dublin in September from 457€

Return flights