Casper to Sun Valley: Road Trip Guide & Distance

How far is Casper from Sun Valley?

The distance from Casper to Sun Valley is 408.2 miles (656.9 km) as the crow flies. Sun Valley is located W of Casper. By car, the driving distance is approximately 489.8 miles, taking about 9h 51min. A direct flight would take roughly 1h 19min. Both are located in United States — Casper in Wyoming and Sun Valley in Idaho.

This is a solid day of driving. Be sure to take breaks every 2-3 hours to avoid driver fatigue, and plan your meals ahead of time. 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 Casper and Sun Valley. 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.