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

Return flights

10 Dec - 17 Dec	United
31 Dec - 11 Jan	United
11 Dec - 14 Dec	Aer Lingus	direct
31 Dec - 08 Jan	United
10 Dec - 17 Dec	Finnair	direct
12 Dec - 07 Jan	Frontier Airlines
31 Dec - 11 Jan	Iberia	direct
29 Dec - 06 Jan	Frontier Airlines
23 Dec - 29 Dec	Delta
22 Dec - 29 Dec	Delta
08 Dec - 05 Jan	Frontier Airlines
19 Dec - 23 Dec	United
30 Dec - 04 Jan	Frontier Airlines
31 Dec - 08 Jan	Iberia	direct
26 Dec - 31 Dec	Finnair
16 Dec - 21 Dec	Frontier Airlines
18 Dec - 28 Dec	Spirit Airlines
16 Dec - 28 Dec	Frontier Airlines
12 Dec - 07 Jan	Finnair	direct
27 Dec - 02 Jan	Frontier Airlines

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 488€

Return flights