Cheapest return flights from Oslo to Chicago in September from $546

AirHint found the following cheapest return flights from Oslo (OSL) to Chicago (ORD) in September 2026 (see full year).

Return flights

01 Sep - 08 Sep Finnair
22 Sep - 29 Sep Finnair
08 Sep - 15 Sep Finnair
11 Sep - 18 Sep Finnair
16 Sep - 23 Sep Finnair
28 Sep - 05 Oct Finnair
29 Sep - 06 Oct Finnair
30 Sep - 07 Oct Finnair
07 Sep - 14 Sep KLM
02 Sep - 09 Sep Finnair
03 Sep - 10 Sep Finnair
09 Sep - 16 Sep Finnair
17 Sep - 24 Sep Finnair
27 Sep - 04 Oct KLM
25 Sep - 02 Oct Icelandair
26 Sep - 03 Oct Icelandair

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

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