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

Return flights

24 Aug - 09 Sep	Delta
13 Aug - 03 Sep	Delta
05 Aug - 04 Sep	Delta
04 Aug - 04 Sep	Delta
17 Aug - 24 Aug	Delta
18 Aug - 25 Aug	Delta
04 Aug - 06 Sep	Delta
14 Aug - 04 Sep	Delta
04 Aug - 19 Aug	Delta
24 Aug - 31 Aug	Delta
10 Aug - 07 Sep	Delta
07 Aug - 07 Sep	Delta
08 Aug - 07 Sep	KLM
09 Aug - 07 Sep	Delta
04 Aug - 12 Aug	Delta

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 655€

Return flights