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

Return flights

19 Aug - 26 Aug	Icelandair
16 Aug - 20 Aug	Icelandair
18 Aug - 25 Aug	Icelandair
21 Aug - 28 Aug	Icelandair
27 Aug - 03 Sep	Icelandair
17 Aug - 02 Sep	Icelandair
24 Aug - 28 Aug	Icelandair
08 Aug - 17 Aug	Icelandair
08 Aug - 11 Aug	Icelandair
07 Aug - 14 Aug	Lufthansa
17 Aug - 24 Aug	United
25 Aug - 01 Sep	United
23 Aug - 30 Aug	United
31 Aug - 07 Sep	United
29 Aug - 05 Sep	United

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 367€

Return flights