AirHint found the following cheapest return flights from Portland (PDX) to Madrid (MAD) in May 2026 (see full year).
Return flights
| 18 May - 02 Jun | British Airways | ||
| 11 May - 25 May | British Airways | ||
| 06 May - 28 May | Finnair |
Also check the deals for one-way flights from Portland to Madrid in May.
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