Distance from Spearfish, SD to Casper, WY is 220Miles or 354 Km. You can get this distance about 3 hours 18 mins. If you want to planning travel with plane for 167 Miles or 269 Km, You can get this distance about 51 mins .
A car with an average MPG will needs 10.19 gallons of gas to get the route between these points.
The estimated cost of gas to get between Spearfish, SD and Casper, WY is $23.13.
During the route, an average car will release 199.64 pounds of CO2 to the atmosphere. Your carbon footprint is 0.91 pounds of CO2 per mile.
* Average US MPG used for calculations is 21.6 MPG.
* Average US gas price used for calculation is 2.27 per gallon.