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

Return flights

31 Aug - 17 Sep	SWISS
31 Aug - 16 Sep	SWISS
19 Aug - 05 Sep	Turkish Airlines
19 Aug - 04 Sep	Turkish Airlines
27 Aug - 30 Sep	Turkish Airlines
13 Aug - 05 Sep	SWISS
26 Aug - 05 Sep	SWISS
24 Aug - 05 Sep	Lufthansa
22 Aug - 05 Sep	Turkish Airlines
15 Aug - 02 Sep	Turkish Airlines
20 Aug - 27 Aug	Turkish Airlines
10 Aug - 30 Aug	Turkish Airlines
01 Aug - 30 Aug	ITA Airways
05 Aug - 12 Aug	United
09 Aug - 23 Aug	LOT
23 Aug - 30 Aug	Turkish Airlines
19 Aug - 26 Aug	United
13 Aug - 20 Aug	United
01 Aug - 17 Aug	ITA Airways
11 Aug - 18 Aug	United

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

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 Sofia in August from $492

Return flights