AirHint found the following cheapest return flights from Philadelphia (PHL) to Dublin (DUB) in December 2025 (see full year).

Return flights

11 Dec - 18 Dec	Delta
12 Dec - 18 Dec	United
29 Dec - 06 Jan	Finnair
12 Dec - 21 Dec	Iberia	direct
17 Dec - 23 Dec	Delta
09 Dec - 12 Dec	Aer Lingus
09 Dec - 13 Dec	Aer Lingus
17 Dec - 22 Dec	United
17 Dec - 23 Dec	Finnair	direct
18 Dec - 23 Dec	Delta
11 Dec - 18 Dec	American Airlines	direct
08 Dec - 05 Jan	Frontier Airlines
29 Dec - 06 Jan	Iberia	direct
30 Dec - 04 Jan	SWISS
27 Dec - 03 Jan	Air Canada
27 Dec - 02 Jan	Air Canada
26 Dec - 02 Jan	Air Canada
28 Dec - 04 Jan	American Airlines
21 Dec - 04 Jan	Finnair
26 Dec - 02 Jan	Finnair	direct

Also check the deals for one-way flights from Philadelphia to Dublin 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 Philadelphia to Dublin in December from $690

Return flights