Cheapest return flights from Philadelphia to Madrid in September from $657

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

Return flights

21 Sep - 30 Sep Delta
29 Sep - 03 Oct jetBlue
28 Sep - 03 Oct jetBlue
26 Sep - 18 Oct Lufthansa
26 Sep - 29 Sep Frontier Airlines
19 Sep - 17 Oct Aer Lingus
26 Sep - 28 Sep Spirit Airlines
17 Sep - 23 Sep United
18 Sep - 22 Sep Frontier Airlines
19 Sep - 24 Sep American Airlines
21 Sep - 30 Sep British Airways direct
17 Sep - 11 Oct British Airways
19 Sep - 24 Sep American Airlines direct
19 Sep - 17 Oct American Airlines direct
26 Sep - 28 Sep British Airways direct
17 Sep - 23 Sep Iberia direct
28 Sep - 03 Oct Finnair direct
29 Sep - 03 Oct American Airlines direct

Also check the deals for one-way flights from Philadelphia to Madrid in September.

Skyscanner

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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