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	Aer Lingus	direct
10 Dec - 17 Dec	Aer Lingus	direct
04 Dec - 11 Dec	Aer Lingus	direct
12 Dec - 19 Dec	Delta
16 Dec - 23 Dec	Aer Lingus	direct
29 Dec - 06 Jan	Delta
10 Dec - 15 Dec	Delta
06 Dec - 13 Dec	Aer Lingus	direct
04 Dec - 07 Dec	Aer Lingus	direct
28 Dec - 17 Jan	Finnair	direct
28 Dec - 17 Jan	United
03 Dec - 27 Dec	Iberia	direct
01 Dec - 27 Dec	Aer Lingus	direct
27 Dec - 17 Jan	Air Canada
27 Dec - 17 Jan	Finnair	direct
26 Dec - 17 Jan	Air Canada
26 Dec - 17 Jan	Aer Lingus	direct
17 Dec - 10 Jan	United
27 Dec - 01 Jan	Aer Lingus	direct
08 Dec - 05 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 359€

Return flights