AirHint found the following cheapest return flights from Chicago (ORD) to Belgrade (BEG) in December 2025 (see full year).

Return flights

31 Dec - 13 Jan	Icelandair
31 Dec - 14 Jan	Icelandair
31 Dec - 21 Jan	Turkish Airlines
30 Dec - 20 Jan	Icelandair
30 Dec - 13 Jan	Lufthansa
30 Dec - 14 Jan	Icelandair
29 Dec - 26 Jan	Lufthansa
29 Dec - 14 Jan	Lufthansa
29 Dec - 13 Jan	Lufthansa
30 Dec - 10 Jan	Icelandair
17 Dec - 24 Dec	Lufthansa
17 Dec - 22 Dec	Lufthansa
17 Dec - 30 Dec	Lufthansa
17 Dec - 27 Dec	Aer Lingus
18 Dec - 30 Dec	LOT
20 Dec - 27 Dec	Arajet
21 Dec - 28 Dec	Spirit Airlines
22 Dec - 30 Dec	LOT
19 Dec - 21 Dec	Frontier Airlines

Also check the deals for one-way flights from Chicago to Belgrade 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 Belgrade in December from $590

Return flights