AirHint found the following cheapest return flights from Chicago (ORD) to Oslo (OSL) in October 2025 (see full year).

Return flights

16 Oct - 21 Oct	Scandinavian Airlines
20 Oct - 27 Oct	Scandinavian Airlines
10 Oct - 17 Oct	Icelandair
30 Oct - 06 Nov	Icelandair
05 Oct - 12 Oct	Icelandair
25 Oct - 04 Nov	Icelandair
25 Oct - 01 Nov	Icelandair
15 Oct - 22 Oct	Icelandair
08 Oct - 18 Oct	United

Also check the deals for one-way flights from Chicago to Oslo in October.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Chicago to Oslo in October from 338€

Return flights