AirHint found the following cheapest one-way flights from Seattle (SEA) to Madrid (MAD) in October 2025 (see full year).
One-Way flights
| 21 Oct | WestJet | ||
| 20 Oct | Iberia | ||
| 29 Oct | Iberia | ||
| 18 Oct | Iberia | ||
| 25 Oct | Iberia | ||
| 23 Oct | Iberia | ||
| 30 Oct | Iberia | ||
| 17 Oct | Air France | ||
| 31 Oct | Iberia |
Also check the deals for return flights from Seattle to Madrid in October.
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