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Distance from Duncan to Spokane Valley
Route Information
The driving distance from Duncan, Washington to Spokane Valley, Washington is 21 mi (33.8 km)
The straight-line (air) distance is 12.7 mi (20.4 km)
The estimated flight time is 0 hr 2 min
The estimated travel time by road is 28 minutes
Traveling secondary roads, moderate in a northeast direction. Average speeds around 39 mph.
Location Details
Origin:
No image available
Destination:
Journey Summary
Traveling from Duncan, Washington to Spokane Valley, Washington covers 21 mi (33.8 km) in a northeast direction. This secondary roads, moderate route typically takes 28 minutes under normal conditions.
Drivers have 3 route options between these locations (17.6-21.0 miles / 28-34 km). The primary route shown here saves 5 minutes compared to alternatives.
The route features scenic views along the way. with average speeds around 39 mph (63 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.