AirHint found the following cheapest return flights from Philadelphia (PHL) to Madrid (MAD) in May 2026 (see full year).

Return flights

04 May - 11 May	jetBlue
10 May - 28 May	jetBlue
10 May - 18 May	jetBlue
01 May - 14 May	Delta
12 May - 29 May	jetBlue
01 May - 09 May	jetBlue
01 May - 10 May	jetBlue
18 May - 22 May	jetBlue
04 May - 11 May	British Airways	direct
08 May - 17 May	TAP
15 May - 01 Jun	Air Canada
14 May - 09 Jun	British Airways	direct
29 May - 04 Jun	TAP
15 May - 01 Jun	Iberia	direct
29 May - 05 Jun	Iberia	direct
29 May - 04 Jun	Iberia	direct

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

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 May from $575

Return flights