AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF) in May 2026 (see full year).
Return flights
| 24 May - 01 Jun | Alaska Airlines | ||
| 19 May - 26 May | Icelandair | direct | |
| 20 May - 27 May | Icelandair | direct | |
| 24 May - 01 Jun | Icelandair | direct |
Also check the deals for one-way flights from Seattle to Keflavik in May.
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