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

Return flights

31 Dec - 14 Jan	Spirit Airlines
29 Dec - 13 Jan	Finnair	direct
31 Dec - 14 Jan	Finnair	direct
29 Dec - 11 Jan	Frontier Airlines
28 Dec - 11 Jan	Frontier Airlines
20 Dec - 24 Jan	Frontier Airlines
29 Dec - 08 Jan	Frontier Airlines
17 Dec - 28 Dec	Lufthansa
18 Dec - 29 Dec	Finnair
16 Dec - 22 Dec	Air Canada
31 Dec - 05 Jan	Spirit Airlines
20 Dec - 06 Jan	Frontier Airlines
22 Dec - 30 Dec	Frontier Airlines
20 Dec - 27 Dec	Frontier Airlines
23 Dec - 26 Dec	Air Canada
19 Dec - 26 Dec	Air Canada
20 Dec - 04 Jan	Frontier Airlines
16 Dec - 22 Dec	Finnair	direct
22 Dec - 30 Dec	Iberia	direct
23 Dec - 26 Dec	Iberia	direct

Also check the deals for one-way flights from Philadelphia to Madrid 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 Madrid in December from $748

Return flights