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

Return flights

23 Sep - 01 Oct	Virgin Atlantic
22 Sep - 07 Oct	Delta
17 Sep - 23 Sep	Delta
26 Sep - 06 Oct	Delta
27 Sep - 05 Oct	Virgin Atlantic
28 Sep - 05 Oct	Delta
26 Sep - 29 Sep	Delta
18 Sep - 21 Sep	Frontier Airlines
11 Sep - 15 Sep	Frontier Airlines
19 Sep - 22 Sep	Frontier Airlines
19 Sep - 21 Sep	Porter Airlines (Canada) Ltd
30 Sep - 25 Oct	Virgin Atlantic
16 Sep - 30 Sep	Delta
20 Sep - 24 Sep	Porter Airlines (Canada) Ltd
20 Sep - 27 Sep	Delta
18 Sep - 22 Sep	Delta
20 Sep - 11 Oct	Virgin Atlantic
08 Sep - 04 Oct	Virgin Atlantic

Also check the deals for one-way flights from Chicago to Barcelona 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 Barcelona in September from 373€

Return flights