Cheapest return flights from Philadelphia to Madrid in September from $470

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

Return flights

17 Sep - 23 Sep KLM
25 Sep - 02 Oct British Airways direct
15 Sep - 25 Sep American Airlines direct
19 Sep - 24 Sep KLM
17 Sep - 11 Oct KLM
29 Sep - 06 Oct Iberia
24 Sep - 28 Sep Iberia
13 Sep - 20 Sep British Airways
11 Sep - 15 Sep American Airlines
25 Sep - 28 Sep Iberia
13 Sep - 20 Sep American Airlines direct
08 Sep - 15 Sep Spirit Airlines
17 Sep - 23 Sep American Airlines direct
29 Sep - 02 Oct Frontier Airlines
08 Sep - 04 Oct Spirit Airlines
08 Sep - 04 Oct British Airways direct
17 Sep - 11 Oct British Airways direct
29 Sep - 02 Oct Finnair 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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