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

Return flights

03 Dec - 10 Dec	Aer Lingus	direct
08 Dec - 15 Dec	Aer Lingus	direct
28 Dec - 17 Jan	United
29 Dec - 17 Jan	United
29 Dec - 18 Jan	United
13 Dec - 20 Dec	United
27 Dec - 17 Jan	United
12 Dec - 21 Dec	Aer Lingus	direct
26 Dec - 31 Dec	Aer Lingus
29 Dec - 17 Jan	Finnair	direct
28 Dec - 17 Jan	Finnair	direct
13 Dec - 20 Dec	Aer Lingus	direct
27 Dec - 17 Jan	Finnair	direct
21 Dec - 03 Jan	KLM
28 Dec - 02 Jan	TAP
28 Dec - 03 Jan	Aer Lingus

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 391€

Return flights