AirHint found the following cheapest one-way flights from Seattle (SEA) to Madrid (MAD) in March 2026 (see full year).
One-Way flights
| 10 Mar | Finnair | ||
| 17 Mar | Iberia | ||
| 18 Mar | Iberia | ||
| 24 Mar | Iberia | ||
| 08 Mar | Iberia | ||
| 09 Mar | Iberia | ||
| 04 Mar | Iberia | ||
| 11 Mar | Delta | ||
| 20 Mar | British Airways | ||
| 06 Mar | Iberia |
Also check the deals for return flights from Seattle to Madrid in March.
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