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

Return flights

17 Aug - 30 Aug	Icelandair
19 Aug - 26 Aug	Lufthansa
31 Aug - 20 Sep	Lufthansa
31 Aug - 07 Sep	Lufthansa
24 Aug - 31 Aug	Lufthansa
26 Aug - 02 Sep	Lufthansa
25 Aug - 01 Sep	Austrian Airlines
20 Aug - 27 Aug	Lufthansa
21 Aug - 28 Aug	Lufthansa
23 Aug - 30 Aug	Lufthansa
27 Aug - 03 Sep	Lufthansa
28 Aug - 04 Sep	Lufthansa
17 Aug - 24 Aug	Lufthansa
18 Aug - 25 Aug	Lufthansa
22 Aug - 29 Aug	Lufthansa
30 Aug - 06 Sep	Lufthansa
16 Aug - 23 Aug	Lufthansa
29 Aug - 05 Sep	Lufthansa

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 421€

Return flights