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

Return flights

18 Aug - 03 Sep	Icelandair
28 Aug - 04 Sep	Icelandair
18 Aug - 25 Aug	Icelandair
12 Aug - 19 Aug	Icelandair
18 Aug - 23 Aug	Icelandair
12 Aug - 21 Aug	Icelandair
13 Aug - 21 Aug	Icelandair
20 Aug - 27 Aug	Icelandair
22 Aug - 29 Aug	Icelandair
06 Aug - 13 Aug	Icelandair
16 Aug - 23 Aug	Icelandair
31 Aug - 07 Sep	Icelandair
29 Aug - 07 Sep	Icelandair
27 Aug - 31 Aug	Icelandair
26 Aug - 02 Sep	Scandinavian Airlines

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

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 August from 373€

Return flights