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

Return flights

04 Sep - 10 Sep	Icelandair
04 Sep - 14 Sep	Icelandair
05 Sep - 16 Sep	Icelandair
08 Sep - 18 Sep	Icelandair
07 Sep - 18 Sep	Icelandair
03 Sep - 10 Sep	Icelandair
18 Sep - 25 Sep	Icelandair
05 Sep - 10 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
04 Sep - 09 Sep	Icelandair
27 Sep - 03 Oct	Scandinavian Airlines
30 Sep - 07 Oct	Scandinavian Airlines
29 Sep - 13 Oct	Scandinavian Airlines
24 Sep - 06 Oct	Icelandair
24 Sep - 01 Oct	Icelandair
27 Sep - 06 Oct	Scandinavian Airlines
24 Sep - 06 Oct	United	direct
30 Sep - 07 Oct	Delta	direct
29 Sep - 13 Oct	Delta	direct
27 Sep - 06 Oct	Delta	direct

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

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 Amsterdam in September from 408€

Return flights