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

Return flights

31 Dec - 24 Jan	Turkish Airlines
11 Dec - 18 Dec	Icelandair
03 Dec - 24 Jan	Frontier Airlines
05 Dec - 09 Dec	TAP
13 Dec - 30 Jan	Frontier Airlines
12 Dec - 11 Jan	Frontier Airlines
24 Dec - 17 Jan	TAP
29 Dec - 12 Jan	Austrian Airlines
10 Dec - 09 Jan	Icelandair
29 Dec - 24 Jan	LOT
13 Dec - 11 Jan	Spirit Airlines
07 Dec - 21 Dec	Lufthansa
15 Dec - 30 Jan	Spirit Airlines
10 Dec - 14 Dec	SWISS
03 Dec - 27 Dec	Frontier Airlines
06 Dec - 27 Dec	Spirit Airlines
06 Dec - 20 Dec	LOT
15 Dec - 25 Dec	Spirit Airlines
13 Dec - 20 Dec	Frontier Airlines
13 Dec - 17 Dec	Spirit 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 531€

Return flights