AirHint found the following cheapest one-way flights from Seattle (SEA) to Madrid (MAD) in December 2025 (see full year).
One-Way flights
| 02 Dec | British Airways | ||
| 04 Dec | Iberia | ||
| 05 Dec | Iberia | ||
| 06 Dec | Iberia | ||
| 26 Dec | Alaska Airlines | ||
| 03 Dec | Iberia | ||
| 08 Dec | Iberia | ||
| 10 Dec | Iberia | ||
| 25 Dec | United | ||
| 11 Dec | Iberia |
Also check the deals for return flights from Seattle to Madrid in December.
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