Cheapest return flights from Chicago to Oslo in September from $446

Best time to book flights for Chicago (ORD) to Oslo (OSL) flights at AirHint

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

Return flights

01 Sep - 07 Sep Icelandair
30 Sep - 07 Oct Scandinavian Airlines
14 Sep - 21 Sep Icelandair
10 Sep - 17 Sep Icelandair
03 Sep - 10 Sep Icelandair
05 Sep - 12 Sep Icelandair
06 Sep - 13 Sep Icelandair
01 Sep - 08 Sep Icelandair
23 Sep - 30 Sep Scandinavian Airlines
25 Sep - 02 Oct Scandinavian Airlines
02 Sep - 09 Sep Scandinavian Airlines
16 Sep - 23 Sep Scandinavian Airlines

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

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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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