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

Return flights

23 Sep - 05 Oct	Aer Lingus	direct
25 Sep - 30 Sep	Ryanair
25 Sep - 28 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
24 Sep - 05 Oct	Ryanair
22 Sep - 05 Oct	Ryanair
24 Sep - 01 Oct	Ryanair
18 Sep - 29 Sep	Ryanair
22 Sep - 30 Sep	Ryanair
18 Sep - 30 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
17 Sep - 22 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
29 Sep - 03 Oct	Ryanair
22 Sep - 01 Oct	Ryanair
18 Sep - 23 Sep	Ryanair
29 Sep - 11 Oct	Aer Lingus
28 Sep - 05 Oct	Ryanair
30 Sep - 07 Oct	Aer Lingus

Also check the deals for one-way flights from Shannon to New York 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 Shannon to New York in September from $538

Return flights