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

Return flights

05 Oct - 15 Oct	Delta
15 Oct - 22 Oct	Air France
21 Oct - 28 Oct	KLM
22 Oct - 29 Oct	KLM
07 Oct - 14 Oct	Delta
22 Oct - 04 Nov	Delta
14 Oct - 21 Oct	Delta
28 Oct - 04 Nov	Delta
20 Oct - 27 Oct	KLM
23 Oct - 30 Oct	Virgin Atlantic
22 Oct - 30 Oct	Delta
29 Oct - 05 Nov	Virgin Atlantic
27 Oct - 03 Nov	Delta
26 Oct - 11 Nov	Delta
08 Oct - 15 Oct	Delta
30 Oct - 06 Nov	Delta
26 Oct - 02 Nov	Frontier Airlines
31 Oct - 07 Nov	Delta
31 Oct - 22 Nov	Virgin Atlantic
20 Oct - 01 Nov	Virgin Atlantic

Also check the deals for one-way flights from Chicago to Barcelona 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 Barcelona in October from 393€

Return flights