AirHint found the following cheapest one-way flights from Seattle (SEA) to Madrid (MAD) in May 2026 (see full year).
One-Way flights
| 04 May | Iberia | ||
| 07 May | Iberia | ||
| 05 May | Iberia | ||
| 12 May | Iberia | ||
| 19 May | Iberia | ||
| 14 May | Iberia | ||
| 28 May | Iberia | ||
| 30 May | Iberia | ||
| 27 May | Iberia | ||
| 11 May | Iberia |
Also check the deals for return flights from Seattle to Madrid in May.
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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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