Cheapest return flights from Chicago to Sofia in December from 541€

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

Return flights

29 Dec - 12 Jan Austrian Airlines
08 Dec - 08 Jan Lufthansa
10 Dec - 08 Jan LOT
07 Dec - 21 Dec Lufthansa
12 Dec - 10 Jan Frontier Airlines
14 Dec - 11 Jan Spirit Airlines
27 Dec - 13 Jan Air Serbia
14 Dec - 10 Jan TAP
26 Dec - 09 Jan Spirit Airlines
14 Dec - 09 Jan Spirit Airlines
12 Dec - 08 Jan Frontier Airlines
07 Dec - 27 Dec Turkish Airlines
21 Dec - 28 Dec Frontier Airlines

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

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