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

Return flights

27 Sep - 30 Sep	Air Canada
23 Sep - 30 Sep	WestJet
28 Sep - 26 Oct	TAP
29 Sep - 26 Oct	TAP
20 Sep - 02 Oct	Frontier Airlines
23 Sep - 29 Sep	Austrian Airlines
27 Sep - 26 Oct	Turkish Airlines
22 Sep - 29 Sep	Frontier Airlines
26 Sep - 26 Oct	TAP
20 Sep - 21 Sep	Spirit Airlines
23 Sep - 30 Sep	Delta	direct
22 Sep - 29 Sep	Delta	direct
23 Sep - 29 Sep	Delta	direct
28 Sep - 26 Oct	Delta	direct
29 Sep - 26 Oct	Delta	direct
20 Sep - 02 Oct	Delta	direct
26 Sep - 26 Oct	Delta	direct
27 Sep - 26 Oct	Delta	direct
19 Sep - 28 Sep	Delta
22 Sep - 28 Sep	Aer Lingus

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 $670

Return flights