The cheapest flight to Sofia Airport you can get by boooking 10 days before departure.
The most popular airlines on the route Chicago O'Hare - Sofia Airport: Turkish Airlines (TK), LOT (LO), Lufthansa (LH).
There is no direct flight on the route from Chicago O'Hare to Sofia Airport
Il volo con scalo più breve dura 11h 40min.
Chicago (IL) Sofia