AirHint found the following cheapest one-way flights from Chicago (ORD) to Oslo (OSL) in October 2025 (see full year).
One-Way flights
| 23 Oct | TAP | ||
| 28 Oct | Frontier Airlines | ||
| 21 Oct | Spirit Airlines | ||
| 25 Oct | SWISS | ||
| 30 Oct | Delta |
Also check the deals for return flights from Chicago to Oslo in October.
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