The flight distance from Chicago/Rockford International Airport (RFD) in Chicago/Rockford, United States to Sofia Airport (SOF) in Sofia, Bulgaria is 8,417 kilometers (5,230 miles / 4,545 nautical miles). The estimated flight time for this route is approximately 11h, flying northeast at a heading of 44°.

This is a long-haul route typically operated by wide-body aircraft such as the Boeing 777 or Airbus A350. Full meal service, in-flight entertainment, and comfort amenities are standard.

This is an international route connecting United States with Bulgaria. It is an intercontinental flight between North America and Europe. Travelers should check visa requirements, customs regulations, and any travel advisories before booking.

Time zone information: When it's 17:30 in Chicago/Rockford, it's 01:30 in Sofia. With a 8-hour time difference, travelers should plan for significant jet lag. It typically takes one day per hour of time difference to fully adjust.

The return flight from Sofia (SOF) to Chicago/Rockford (RFD) follows a heading of 315° (northwest). Actual flight times may vary depending on wind conditions, air traffic, and the specific aircraft used.

For more information about these airports, visit the Chicago/Rockford International Airport (RFD) and Sofia Airport (SOF) detail pages, or use our flight duration calculator to compare other routes.