AirHint found the following cheapest one-way flights from Seattle (SEA) to Keflavik (KEF) in April 2026 (see full year).
One-Way flights
| 26 Apr | Air France | ||
| 24 Apr | Lufthansa | ||
| 30 Apr | Air France | ||
| 30 Apr | Icelandair | direct | |
| 24 Apr | Icelandair | direct | |
| 26 Apr | Icelandair | direct |
Also check the deals for return flights from Seattle to Keflavik in April.
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