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

Return flights

27 Sep - 02 Oct	Aer Lingus	direct
28 Sep - 05 Oct	Aer Lingus	direct
28 Sep - 06 Oct	Aer Lingus	direct
17 Sep - 24 Sep	Aer Lingus	direct
01 Sep - 08 Sep	Aer Lingus	direct
21 Sep - 28 Sep	Aer Lingus	direct
20 Sep - 30 Sep	Aer Lingus	direct
20 Sep - 27 Sep	Aer Lingus	direct
04 Sep - 12 Sep	Aer Lingus	direct
08 Sep - 19 Sep	Aer Lingus	direct
04 Sep - 11 Sep	United
11 Sep - 01 Oct	Aer Lingus	direct
05 Sep - 13 Sep	United
12 Sep - 14 Sep	Aer Lingus	direct
25 Sep - 02 Oct	United	direct
29 Sep - 05 Oct	United	direct

Also check the deals for one-way flights from New York to Shannon 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 Shannon in September from $319

Return flights