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

Return flights

24 Aug - 31 Aug	Icelandair
15 Aug - 05 Sep	TAP
12 Aug - 18 Sep	Spirit Airlines
12 Aug - 14 Sep	Spirit Airlines
24 Aug - 07 Sep	Icelandair
05 Aug - 14 Sep	Spirit Airlines
18 Aug - 09 Sep	Turkish Airlines
05 Aug - 26 Aug	Icelandair
04 Aug - 26 Aug	Icelandair
24 Aug - 09 Sep	Icelandair
04 Aug - 13 Sep	Icelandair
09 Aug - 14 Sep	TAP
10 Aug - 26 Aug	British Airways
04 Aug - 25 Aug	Spirit Airlines
18 Aug - 09 Sep	Austrian Airlines	direct
13 Aug - 19 Aug	Spirit Airlines
16 Aug - 23 Aug	TAP
02 Aug - 16 Aug	Icelandair
04 Aug - 12 Aug	Air France
01 Aug - 14 Aug	United

Also check the deals for one-way flights from Chicago to Vienna in August.

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 August from 507€

Return flights