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

Return flights

18 Aug - 29 Aug	KLM
11 Aug - 21 Aug	Air France
04 Aug - 20 Aug	Delta
17 Aug - 26 Aug	Delta
18 Aug - 25 Aug	KLM
11 Aug - 24 Aug	Delta
17 Aug - 24 Aug	Delta
10 Aug - 23 Aug	Delta
22 Aug - 08 Sep	Delta
03 Aug - 19 Aug	Delta
21 Aug - 25 Aug	Virgin Atlantic
31 Aug - 11 Sep	Air France
29 Aug - 13 Sep	Delta
28 Aug - 02 Sep	Delta

Also check the deals for one-way flights from Chicago to Barcelona 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 Barcelona in August from 435€

Return flights