AirHint found the following cheapest return flights from Portland (PDX) to Oslo (OSL) in March 2026 (see full year).
Return flights
| 12 Mar - 20 Mar | Icelandair | ||
| 14 Mar - 04 Apr | Icelandair | ||
| 20 Mar - 31 Mar | British Airways |
Also check the deals for one-way flights from Portland to Oslo in March.
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