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

Return flights

02 Sep - 09 Sep	Air Canada
08 Sep - 15 Sep	Air Canada
15 Sep - 22 Sep	Air Canada
05 Sep - 08 Sep	Lufthansa
17 Sep - 24 Sep	Air Canada
16 Sep - 23 Sep	Air Canada
18 Sep - 25 Sep	Air Canada
10 Sep - 20 Sep	United
05 Sep - 13 Sep	Air Canada
12 Sep - 15 Sep	Air Canada
10 Sep - 31 Oct	Air Canada
10 Sep - 02 Oct	United
30 Sep - 07 Oct	United
27 Sep - 04 Oct	United
28 Sep - 05 Oct	United
29 Sep - 06 Oct	United
27 Sep - 20 Oct	Delta
18 Sep - 13 Oct	United
27 Sep - 05 Oct	United
26 Sep - 03 Oct	Air Canada

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 289€

Return flights