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

Return flights

09 Sep - 18 Sep	Aer Lingus
09 Sep - 16 Sep	Aer Lingus
09 Sep - 23 Sep	Aer Lingus
09 Sep - 26 Sep	Aer Lingus
09 Sep - 17 Sep	Air France	direct
09 Sep - 18 Sep	Air France	direct
09 Sep - 16 Sep	Air France	direct
09 Sep - 23 Sep	Delta	direct
19 Sep - 22 Sep	Lufthansa
11 Sep - 16 Sep	Delta
22 Sep - 07 Oct	Air France	direct
30 Sep - 16 Oct	Air France	direct
29 Sep - 21 Oct	Air France	direct
17 Sep - 16 Oct	Air France	direct
17 Sep - 16 Oct	Icelandair
30 Sep - 05 Oct	Icelandair
30 Sep - 07 Oct	Air Canada
17 Sep - 30 Oct	Aer Lingus	direct
29 Sep - 03 Oct	Icelandair
15 Sep - 02 Oct	Iberia

Also check the deals for one-way flights from New York 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 New York to Dublin in September from $346

Return flights