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

Return flights

05 Sep - 18 Sep	TAP
01 Sep - 30 Sep	American Airlines
03 Sep - 22 Oct	British Airways
19 Sep - 28 Sep	British Airways
22 Sep - 28 Sep	British Airways
03 Sep - 15 Sep	British Airways
19 Sep - 29 Sep	British Airways
13 Sep - 23 Sep	British Airways
11 Sep - 17 Sep	British Airways
19 Sep - 01 Oct	British Airways
03 Sep - 14 Sep	TAP
15 Sep - 06 Oct	Scandinavian Airlines
17 Sep - 21 Sep	Lufthansa
17 Sep - 05 Oct	United
17 Sep - 15 Oct	United
10 Sep - 03 Oct	Lufthansa
27 Sep - 04 Oct	Scandinavian Airlines
26 Sep - 10 Oct	Brussels Airlines
21 Sep - 10 Oct	Lufthansa
15 Sep - 04 Oct	Lufthansa

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 424€

Return flights