Casper to Idaho Falls: Road Trip Guide & Distance

How far is Casper from Idaho Falls?

The distance from Casper to Idaho Falls is 291.2 miles (468.7 km) as the crow flies. Idaho Falls is located W of Casper. By car, the driving distance is approximately 364.1 miles, taking about 7h 19min. A direct flight would take roughly 1h 5min. Both are located in United States — Casper in Wyoming and Idaho Falls 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 Idaho Falls. 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.