AirHint found the following cheapest return flights from Portland (PDX) to Keflavik (KEF) in March 2026 (see full year).
Return flights
| 10 Mar - 15 Mar | Icelandair | direct | |
| 04 Mar - 09 Mar | Alaska Airlines | ||
| 11 Mar - 16 Mar | Alaska Airlines | ||
| 21 Mar - 30 Mar | Hawaiian Airlines | ||
| 22 Mar - 29 Mar | Alaska Airlines | ||
| 23 Mar - 28 Mar | Icelandair |
Also check the deals for one-way flights from Portland to Keflavik in March.
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