AirHint found the following cheapest one-way flights from Seattle (SEA) to Barcelona (BCN) in March 2026 (see full year).
One-Way flights
| 10 Mar | Icelandair | ||
| 25 Mar | Icelandair | ||
| 05 Mar | Icelandair | ||
| 01 Mar | Lufthansa | ||
| 19 Mar | Alaska Airlines | ||
| 14 Mar | British Airways | ||
| 13 Mar | United |
Also check the deals for return flights from Seattle to Barcelona in March.
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