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

Return flights

21 Sep - 26 Sep	Scandinavian Airlines
04 Sep - 10 Sep	Scandinavian Airlines
07 Sep - 16 Sep	Scandinavian Airlines
14 Sep - 22 Sep	Scandinavian Airlines
07 Sep - 17 Sep	TAP
08 Sep - 15 Sep	Scandinavian Airlines
30 Sep - 07 Oct	Icelandair
17 Sep - 06 Oct	Icelandair
24 Sep - 15 Oct	Icelandair
24 Sep - 01 Oct	Icelandair
27 Sep - 04 Oct	Icelandair
11 Sep - 14 Sep	Icelandair
10 Sep - 17 Sep	Icelandair
04 Sep - 08 Sep	Icelandair
01 Sep - 08 Sep	Icelandair
24 Sep - 15 Oct	Delta	direct
17 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 459€

Return flights