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SPF to SOF: distance & flight time
Spearfish-South Dakota (Black Hills Airport-Clyde Ice Field) → Sofia (Sofia Airport)
5,590 mi
8,996 km · 4,857 nm
11h 26m
estimated nonstop flight time
+9h
time difference · heading northeast
See live SPF→SOF fares Phone-only fares on this route — call free
Flight time details
5,590 miles nonstop takes roughly 11h 26m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 9-hour time gain when reading arrival times on your ticket.
The two airports
- SPF — Black Hills Airport-Clyde Ice Field · Spearfish-South Dakota, 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 SPF
- RCA · Ellsworth Air Force Base41 mi away
- RAP · Rapid City Regional Airport47 mi away
- GCC · Gillette Campbell County Airport87 mi away
- CDR · Chadron Municipal Airport119 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 SPF from SOF?
The flight distance from Spearfish-South Dakota (SPF) to Sofia (SOF) is 5,590 miles (8,996 km, 4,857 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SPF to SOF?
A nonstop flight takes about 11h 26m 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 SPF to SOF?
Nonstop service on SPF–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 11h 26m nonstop estimate.
What is the time difference between Spearfish-South Dakota and Sofia?
Sofia is 9 hours ahead of Spearfish-South Dakota.
What is the cheapest way to fly from SPF to SOF?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SPF–SOF that never appear on search engines, with no booking fees.
Why are some SPF to SOF fares phone-only?
Consolidator contracts let us sell certain SPF–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.