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
10 Dec - 15 Jan	Finnair	direct
07 Dec - 14 Dec	Aer Lingus	direct
08 Dec - 15 Dec	Aer Lingus	direct
12 Dec - 19 Dec	United
26 Dec - 09 Jan	British Airways
12 Dec - 19 Dec	Aer Lingus	direct
26 Dec - 30 Dec	British Airways
26 Dec - 30 Dec	Aer Lingus	direct
26 Dec - 09 Jan	Aer Lingus	direct
13 Dec - 20 Dec	United
17 Dec - 24 Dec	United
13 Dec - 20 Dec	Aer Lingus	direct
28 Dec - 04 Jan	Aer Lingus	direct
22 Dec - 02 Jan	Air France
22 Dec - 03 Jan	Delta
22 Dec - 02 Jan	Finnair	direct
22 Dec - 03 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 393€

Return flights