AirHint found the following cheapest return flights from Portland (PDX) to Keflavik (KEF) in September 2026 (see full year).
Return flights
| 23 Sep - 30 Sep | Icelandair | direct | |
| 24 Sep - 01 Oct | Delta | ||
| 25 Sep - 02 Oct | Delta | ||
| 26 Sep - 03 Oct | Delta | ||
| 01 Sep - 15 Sep | Icelandair | direct |
Also check the deals for one-way flights from Portland to Keflavik in September.
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