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

Return flights

16 Dec - 04 Jan	Aer Lingus	direct
23 Dec - 30 Dec	Aer Lingus	direct
17 Dec - 04 Jan	Aer Lingus	direct
20 Dec - 02 Jan	Aer Lingus	direct
20 Dec - 27 Dec	Aer Lingus	direct
20 Dec - 03 Jan	Aer Lingus	direct
18 Dec - 04 Jan	Aer Lingus	direct
19 Dec - 23 Dec	American Airlines
19 Dec - 22 Dec	American Airlines
19 Dec - 29 Dec	British Airways
19 Dec - 04 Jan	British Airways
19 Dec - 22 Dec	Aer Lingus	direct
19 Dec - 23 Dec	Aer Lingus	direct
19 Dec - 29 Dec	Aer Lingus	direct

Also check the deals for one-way flights from New York to Shannon in December.

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 December from $557

Return flights