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

Return flights

04 Sep - 11 Sep	Icelandair
08 Sep - 11 Sep	Icelandair
05 Sep - 12 Sep	Icelandair
06 Sep - 04 Oct	Scandinavian Airlines
11 Sep - 14 Sep	Turkish Airlines
07 Sep - 14 Sep	TAP
05 Sep - 04 Oct	Scandinavian Airlines
19 Sep - 26 Sep	Turkish Airlines
02 Sep - 09 Sep	Lufthansa
18 Sep - 25 Sep	Turkish Airlines
20 Sep - 28 Sep	Turkish Airlines
26 Sep - 30 Sep	Spirit Airlines

Also check the deals for one-way flights from Chicago to Berlin 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 Berlin in September from $472

Return flights