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

Return flights

10 Dec - 17 Dec	Delta
07 Dec - 14 Dec	Frontier Airlines
29 Dec - 12 Jan	Frontier Airlines
13 Dec - 08 Jan	Frontier Airlines
31 Dec - 07 Jan	Frontier Airlines
10 Dec - 18 Dec	Delta
22 Dec - 10 Jan	Frontier Airlines
22 Dec - 11 Jan	Frontier Airlines
15 Dec - 10 Jan	Delta
24 Dec - 27 Dec	Frontier Airlines
17 Dec - 06 Jan	Frontier Airlines
21 Dec - 11 Jan	Frontier Airlines
30 Dec - 06 Jan	Delta
21 Dec - 10 Jan	Frontier Airlines
16 Dec - 26 Dec	KLM
17 Dec - 28 Dec	KLM
20 Dec - 23 Dec	Porter Airlines (Canada) Ltd
23 Dec - 26 Dec	Delta
20 Dec - 26 Dec	Frontier Airlines
21 Dec - 27 Dec	Delta

Also check the deals for one-way flights from Chicago to Barcelona in December.

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 December from $622

Return flights