Boulder to Casper: Road Trip Guide & Distance

How far is Boulder from Casper?

The distance from Boulder to Casper is 204.3 miles (328.8 km) as the crow flies. Casper is located NNW of Boulder. By car, the driving distance is approximately 255.4 miles, taking about 5h 8min. A direct flight would take roughly 55min. Both are located in United States — Boulder in Colorado and Casper in Wyoming.

For a drive of this length, it's recommended to plan at least one quick rest stop to stretch your legs and grab a coffee. Since you'll be heading mostly West, pack a good pair of sunglasses if you plan to drive during the late afternoon to avoid the harsh sun glare.

Coordinates come from public place data for Boulder and Casper. The driving distance is estimated from straight-line distance with a road-factor model, so confirm the route in your navigation app. Fuel, flight, bus, and train values are planning estimates and can change by date, provider, road closures, and border rules.