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

Return flights

02 Dec - 09 Dec	Iberia	direct
01 Dec - 11 Dec	Iberia	direct
03 Dec - 10 Dec	American Airlines
10 Dec - 15 Dec	Iberia	direct
11 Dec - 14 Dec	Iberia	direct
11 Dec - 08 Jan	Iberia
06 Dec - 13 Dec	Aer Lingus	direct
11 Dec - 08 Jan	Iberia	direct
15 Dec - 10 Jan	Iberia
15 Dec - 10 Jan	Iberia	direct
31 Dec - 07 Jan	Iberia
31 Dec - 07 Jan	Finnair	direct
29 Dec - 06 Jan	Iberia	direct
11 Dec - 18 Dec	Aer Lingus
15 Dec - 22 Dec	Delta
13 Dec - 20 Dec	United
23 Dec - 17 Jan	Iberia	direct
02 Dec - 06 Dec	Spirit Airlines
22 Dec - 17 Jan	United
22 Dec - 17 Jan	Iberia	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 $389

Return flights