Need help booking?
Unpublished phone-only deals available
SDF to SOF: distance & flight time
Louisville (Louisville International Standiford Field) → Sofia (Sofia Airport)
5,301 mi
8,532 km · 4,607 nm
10h 52m
estimated nonstop flight time
+7h
time difference · heading northeast
See live SDF→SOF fares Phone-only fares on this route — call free
Flight time details
5,301 miles nonstop takes roughly 10h 52m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 7-hour time gain when reading arrival times on your ticket.
The two airports
- SDF — Louisville International Standiford Field · Louisville, United States
- SOF — Sofia Airport · Sofia, Bulgaria
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near SDF
- LOU · Bowman Field5 mi away
- FTK · Godman Army Air Field22 mi away
- FFT · Capital City Airport45 mi away
- LEX · Blue Grass Airport62 mi away
Near SOF
- PDV · Plovdiv International Airport85 mi away
- INI · Nis Airport90 mi away
- SKP · Skopje Alexander the Great Airport105 mi away
- CRA · Craiova Airport115 mi away
Frequently asked questions
How far is SDF from SOF?
The flight distance from Louisville (SDF) to Sofia (SOF) is 5,301 miles (8,532 km, 4,607 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SDF to SOF?
A nonstop flight takes about 10h 52m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from SDF to SOF?
Nonstop service on SDF–SOF depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 10h 52m nonstop estimate.
What is the time difference between Louisville and Sofia?
Sofia is 7 hours ahead of Louisville.
What is the cheapest way to fly from SDF to SOF?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SDF–SOF that never appear on search engines, with no booking fees.
Why are some SDF to SOF fares phone-only?
Consolidator contracts let us sell certain SDF–SOF tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.