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

Return flights

10 Dec - 17 Dec	Lufthansa
10 Dec - 17 Dec	Iberia	direct
09 Dec - 19 Dec	Iberia	direct
02 Dec - 09 Dec	Iberia	direct
31 Dec - 24 Jan	Iberia
08 Dec - 15 Dec	Iberia
24 Dec - 17 Jan	Iberia
04 Dec - 11 Dec	Iberia	direct
31 Dec - 24 Jan	Finnair	direct
10 Dec - 19 Dec	Finnair
06 Dec - 07 Dec	Frontier Airlines
27 Dec - 17 Jan	British Airways
13 Dec - 21 Dec	Iberia
15 Dec - 10 Jan	Frontier Airlines
10 Dec - 19 Dec	Iberia	direct
27 Dec - 10 Jan	British Airways
27 Dec - 17 Jan	Iberia	direct
24 Dec - 17 Jan	British Airways	direct
12 Dec - 05 Jan	Finnair
21 Dec - 10 Jan	Frontier Airlines

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 $513

Return flights