AirHint found the following cheapest one-way flights from Seattle (SEA) to Barcelona (BCN) in May 2026 (see full year).
One-Way flights
| 19 May | Icelandair | ||
| 09 May | Icelandair | ||
| 18 May | TAP | ||
| 22 May | WestJet | ||
| 19 May | Air France | direct | |
| 09 May | Air France | direct |
Also check the deals for return flights from Seattle to Barcelona in May.
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