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

Return flights

05 Dec - 16 Dec	TAP
31 Dec - 30 Jan	Lufthansa
05 Dec - 15 Dec	Lufthansa
29 Dec - 12 Jan	Lufthansa
05 Dec - 17 Dec	Delta
06 Dec - 17 Dec	Delta
10 Dec - 14 Dec	Delta
05 Dec - 18 Dec	Lufthansa
11 Dec - 16 Dec	Aer Lingus
12 Dec - 11 Jan	Frontier Airlines
27 Dec - 30 Jan	LOT
14 Dec - 11 Jan	Spirit Airlines
24 Dec - 23 Jan	Frontier Airlines
08 Dec - 21 Dec	KLM
09 Dec - 21 Dec	KLM
31 Dec - 09 Jan	Lufthansa
27 Dec - 23 Jan	LOT
26 Dec - 22 Jan	Lufthansa
25 Dec - 20 Jan	Lufthansa
02 Dec - 06 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 463€

Return flights