AirHint found the following cheapest return flights from Portland (PDX) to Oslo (OSL) in May 2026 (see full year).
Return flights
| 01 May - 10 May | Delta | ||
| 05 May - 16 May | Delta | ||
| 19 May - 25 May | Delta | ||
| 17 May - 24 May | KLM | ||
| 15 May - 27 May | KLM | ||
| 16 May - 26 May | KLM |
Also check the deals for one-way flights from Portland to Oslo in May.
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