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

Return flights

10 Dec - 15 Dec	KLM
30 Dec - 15 Jan	Delta
07 Dec - 15 Dec	Frontier Airlines
11 Dec - 21 Jan	Frontier Airlines
30 Dec - 09 Jan	Delta
31 Dec - 07 Jan	Delta
04 Dec - 07 Dec	Frontier Airlines
25 Dec - 11 Jan	Frontier Airlines
10 Dec - 16 Dec	KLM
13 Dec - 08 Jan	Frontier Airlines
18 Dec - 11 Jan	Frontier Airlines
30 Dec - 11 Jan	Delta
30 Dec - 10 Jan	Delta
29 Dec - 09 Jan	Delta
07 Dec - 18 Dec	Frontier Airlines
04 Dec - 11 Dec	Frontier Airlines
13 Dec - 28 Dec	Frontier Airlines
24 Dec - 27 Dec	Frontier Airlines
20 Dec - 26 Dec	Frontier Airlines
13 Dec - 21 Dec	Virgin Atlantic

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 409€

Return flights