AirHint found the following cheapest one-way flights from Seattle (SEA) to Barcelona (BCN) in September 2026 (see full year).
One-Way flights
| 18 Sep | Icelandair | ||
| 01 Sep | Aer Lingus | ||
| 19 Sep | Icelandair | ||
| 19 Sep | Air France | direct | |
| 01 Sep | Air France | direct | |
| 05 Sep | Delta | ||
| 05 Sep | Delta | direct |
Also check the deals for return flights from Seattle to Barcelona in September.
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