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Distance from Bull Run to Thornhill
Route Information
The driving distance from Bull Run, Maryland to Thornhill, Virginia is 86.7 mi (139.5 km)
The straight-line (air) distance is 65.2 mi (105.0 km)
The estimated flight time is 0 hr 8 min
The estimated travel time by road is 1 hour 48 minutes
Traveling mixed highways and local roads, substantial in a west direction. Average speeds around 44 mph.
Location Details
Origin:
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Destination:
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Journey Summary
Traveling from Bull Run, Maryland to Thornhill, Virginia covers 86.7 mi (139.5 km) in a west direction. This mixed highways and local roads, substantial route typically takes 1 hour 48 minutes under normal conditions.
Drivers have 3 route options between these locations (84.0-88.6 miles / 135-143 km). The primary route shown here saves 12 seconds compared to alternatives.
The route features scenic views, toll sections. with average speeds around 44 mph (71 km/h).
Available Routes
How is the distance calculated?
Driving distances are based on actual road data. We use advanced routing algorithms that consider traffic, tolls, highways, and local streets. For air distances (as the crow flies), we use the Vincenty formula. It's a precise method that accounts for the Earth's shape and provides accuracy up to 0.5 mm.
When multiple route options exist, we display both the shortest and fastest paths. Travel times are estimated based on typical speeds for each road type, though actual times may vary with traffic and weather conditions. All distances are shown in both miles and kilometers for convenience.