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

Return flights

25 Sep - 29 Sep	Lufthansa
23 Sep - 28 Oct	American Airlines
25 Sep - 28 Sep	United
23 Sep - 29 Sep	SWISS
22 Sep - 29 Sep	KLM
23 Sep - 23 Oct	KLM
22 Sep - 30 Sep	Delta
23 Sep - 30 Sep	KLM
22 Sep - 28 Sep	KLM
19 Sep - 21 Sep	Delta
20 Sep - 09 Oct	United
22 Sep - 06 Oct	Brussels Airlines
24 Sep - 02 Oct	Brussels Airlines
20 Sep - 24 Sep	United
20 Sep - 30 Sep	United
21 Sep - 13 Oct	Lufthansa
30 Sep - 16 Oct	British Airways
30 Sep - 31 Oct	British Airways
26 Sep - 05 Oct	Brussels Airlines
23 Sep - 28 Oct	LOT	direct

Also check the deals for one-way flights from Warsaw to Chicago 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 Warsaw to Chicago in September from $531

Return flights