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

Return flights

15 Oct - 22 Oct	Delta
27 Oct - 11 Nov	Delta
29 Oct - 05 Nov	Virgin Atlantic
28 Oct - 05 Nov	Delta
22 Oct - 04 Nov	Delta
28 Oct - 04 Nov	Delta
27 Oct - 17 Nov	Delta
01 Oct - 23 Oct	Delta
28 Oct - 08 Nov	Delta
27 Oct - 03 Nov	Delta
30 Oct - 06 Nov	Delta
16 Oct - 23 Oct	Virgin Atlantic
02 Oct - 05 Oct	Frontier Airlines
03 Oct - 06 Oct	Frontier Airlines
09 Oct - 19 Oct	Frontier Airlines
17 Oct - 20 Oct	Porter Airlines (Canada) Ltd
07 Oct - 12 Oct	Virgin Atlantic
12 Oct - 22 Oct	Porter Airlines (Canada) Ltd
11 Oct - 16 Oct	Porter Airlines (Canada) Ltd
25 Oct - 01 Nov	Delta

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 $438

Return flights