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

Return flights

28 Sep - 05 Oct	Scandinavian Airlines
07 Sep - 17 Sep	Spirit Airlines
08 Sep - 17 Sep	Aer Lingus
09 Sep - 16 Sep	Aer Lingus
08 Sep - 16 Sep	Aer Lingus
02 Sep - 24 Sep	Aer Lingus
10 Sep - 17 Sep	Aer Lingus
22 Sep - 26 Sep	Scandinavian Airlines
01 Sep - 12 Sep	Aer Lingus
09 Sep - 21 Sep	Spirit Airlines
02 Sep - 10 Sep	Aer Lingus
29 Sep - 06 Oct	Scandinavian Airlines
21 Sep - 01 Oct	TAP
27 Sep - 04 Oct	Scandinavian Airlines
21 Sep - 02 Oct	Aer Lingus
30 Sep - 02 Oct	Spirit Airlines
21 Sep - 02 Oct	Delta	direct
21 Sep - 01 Oct	Delta	direct
29 Sep - 06 Oct	Delta	direct
27 Sep - 04 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 476€

Return flights