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

Return flights

10 Sep - 24 Sep	Ryanair
02 Sep - 07 Sep	Air France	direct
02 Sep - 12 Sep	Air France	direct
11 Sep - 14 Sep	Air France	direct
06 Sep - 14 Sep	Air France	direct
13 Sep - 19 Sep	Air France	direct
11 Sep - 15 Sep	Air France	direct
03 Sep - 10 Sep	Ryanair
17 Sep - 23 Sep	Ryanair
16 Sep - 23 Sep	Ryanair
23 Sep - 06 Oct	Ryanair
28 Sep - 05 Oct	Ryanair

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 $468

Return flights