AirHint found the following cheapest return flights from Seattle (SEA) to Oslo (OSL) in December 2025 (see full year).
Return flights
| 10 Dec - 17 Dec | Delta | ||
| 07 Dec - 31 Dec | Icelandair | ||
| 19 Dec - 22 Dec | Air France | ||
| 19 Dec - 31 Dec | Icelandair | ||
| 19 Dec - 27 Dec | Icelandair |
Also check the deals for one-way flights from Seattle to Oslo in December.
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