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

Return flights

21 Oct - 15 Nov	Scandinavian Airlines
29 Oct - 05 Nov	Scandinavian Airlines
25 Oct - 01 Nov	Icelandair
12 Oct - 22 Oct	Icelandair
09 Oct - 22 Oct	Icelandair
16 Oct - 23 Oct	Icelandair
07 Oct - 14 Oct	Icelandair
09 Oct - 16 Oct	Icelandair
08 Oct - 15 Oct	Icelandair
20 Oct - 27 Oct	Scandinavian Airlines
26 Oct - 02 Nov	Scandinavian Airlines
08 Oct - 13 Oct	Icelandair
31 Oct - 07 Nov	Scandinavian Airlines
23 Oct - 30 Oct	Scandinavian Airlines
28 Oct - 04 Nov	Icelandair
13 Oct - 20 Oct	Icelandair

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 341€

Return flights