Cheapest return flights from Chicago to Sofia in September from 470€

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

Return flights

03 Sep - 11 Sep Turkish Airlines
08 Sep - 26 Sep Turkish Airlines
06 Sep - 24 Sep Turkish Airlines
29 Sep - 14 Oct Turkish Airlines
06 Sep - 23 Sep Turkish Airlines
24 Sep - 13 Oct Turkish Airlines
29 Sep - 06 Oct Turkish Airlines
01 Sep - 18 Sep Turkish Airlines
06 Sep - 14 Sep Turkish Airlines
28 Sep - 05 Oct Turkish Airlines
20 Sep - 05 Oct Turkish Airlines
23 Sep - 18 Oct Spirit Airlines
08 Sep - 15 Sep United
10 Sep - 17 Sep United
14 Sep - 21 Sep United
05 Sep - 14 Sep Lufthansa
17 Sep - 08 Oct Spirit Airlines
16 Sep - 01 Oct Spirit Airlines
06 Sep - 11 Oct Lufthansa
03 Sep - 02 Oct United

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

Skyscanner

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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