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

Return flights

07 Dec - 14 Dec	Turkish Airlines
03 Dec - 07 Dec	Air Canada
27 Dec - 31 Jan	Air Canada
12 Dec - 11 Jan	Spirit Airlines
13 Dec - 11 Jan	Spirit Airlines
14 Dec - 11 Jan	Spirit Airlines
11 Dec - 10 Jan	Spirit Airlines
25 Dec - 25 Jan	SWISS
24 Dec - 24 Jan	LOT
24 Dec - 31 Jan	Austrian Airlines
24 Dec - 17 Jan	Austrian Airlines
06 Dec - 27 Dec	Austrian Airlines
06 Dec - 20 Dec	Air Canada
27 Dec - 09 Jan	LOT
13 Dec - 20 Dec	LOT
13 Dec - 27 Dec	Spirit Airlines
15 Dec - 29 Dec	Spirit Airlines
20 Dec - 27 Dec	jetBlue	direct
23 Dec - 31 Dec	Air Canada
06 Dec - 27 Dec	Air Serbia	direct

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 $504

Return flights