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

Return flights

16 Oct - 21 Oct	Frontier Airlines
20 Oct - 27 Oct	Porter Airlines (Canada) Ltd
27 Oct - 12 Nov	Delta
20 Oct - 23 Oct	Frontier Airlines
15 Oct - 20 Oct	Porter Airlines (Canada) Ltd
24 Oct - 03 Nov	Delta
02 Oct - 30 Oct	Delta
02 Oct - 31 Oct	Delta
03 Oct - 31 Oct	Delta
01 Oct - 31 Oct	Delta
08 Oct - 15 Oct	Delta
11 Oct - 19 Oct	Delta

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

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 October from $684

Return flights