Cheapest return flights from Chicago to Sofia in December from $576

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

Return flights

31 Dec - 13 Jan Lufthansa
28 Dec - 15 Jan Lufthansa
30 Dec - 11 Jan Austrian Airlines
28 Dec - 11 Jan Austrian Airlines
29 Dec - 11 Jan Austrian Airlines
24 Dec - 11 Jan Lufthansa
27 Dec - 11 Jan SWISS
24 Dec - 09 Jan Lufthansa
24 Dec - 15 Jan SWISS
27 Dec - 13 Jan SWISS

Also check the deals for one-way flights from Chicago to Sofia in December.

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