AirHint found the following cheapest one-way flights from Seattle (SEA) to Madrid (MAD) in March 2026 (see full year).
One-Way flights
| 07 Mar | WestJet | ||
| 29 Mar | WestJet | ||
| 06 Mar | Alaska Airlines | ||
| 03 Mar | Iberia | ||
| 08 Mar | Iberia | ||
| 09 Mar | Iberia | ||
| 01 Mar | Iberia | ||
| 02 Mar | Iberia | ||
| 16 Mar | Iberia | ||
| 23 Mar | Iberia |
Also check the deals for return flights from Seattle to Madrid in March.
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