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

Return flights

24 Sep - 22 Oct	Spirit Airlines
24 Sep - 08 Oct	Spirit Airlines
30 Sep - 14 Oct	Icelandair
11 Sep - 18 Sep	Spirit Airlines
30 Sep - 14 Oct	Austrian Airlines	direct
11 Sep - 18 Sep	Austrian Airlines	direct

Also check the deals for one-way flights from Chicago to Vienna 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 Vienna in September from 459€

Return flights