AirHint found the following cheapest one-way flights from Seattle (SEA) to Madrid (MAD) in April 2026 (see full year).
One-Way flights
| 28 Apr | American Airlines | ||
| 27 Apr | Iberia | ||
| 06 Apr | Iberia | ||
| 12 Apr | Iberia | ||
| 13 Apr | Iberia | ||
| 19 Apr | Iberia | ||
| 21 Apr | Iberia | ||
| 26 Apr | Iberia | ||
| 25 Apr | Iberia | ||
| 11 Apr | Iberia |
Also check the deals for return flights from Seattle to Madrid in April.
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