Distance from Ajax, South Dakota to Barnum, Wyoming
The driving distance from Ajax, South Dakota to Barnum, Wyoming is 289 mi (465.1 km)
The straight-line (air) distance is approximately 115.9 mi (186.6 km)
Estimated travel time by road is 4 hours 18 minutes
We found 3 routes between Ajax and Barnum.
Available Routes
Route Directions
Get on I-90 W in Rapid City from SD-79 N and Cambell St
Follow I-90 W and I-25 S/US-87 S to WY-191 N in Johnson County. Take exit 254 from I-25 S/US-87 S
Follow WY-190 W to Barnum Rd
Route Directions
Follow SD-79 S to US-18 W/US-385 N in Northeast Fall River
Follow US-18 W and I-25 N to WY-191 N in Johnson County. Take exit 254 from I-25 N
Follow WY-190 W to Barnum Rd
Route Directions
Take US-16 W, WY-450 W, WY-387 W and WY-192 W to WY-190 W in Johnson County
Follow WY-190 W to Barnum Rd
Journey Details
Traveling from Ajax, South Dakota to Barnum, Wyoming covers 230.7 miles (371 km) in a west direction. This mixed highways and local roads, long-distance route typically takes 4 hours 9 minutes under normal conditions.
Drivers have 3 route options between these locations (231-323 miles / 371-520 km). The primary route shown here saves 48 minutes compared to alternatives.
The route features scenic views. During midday weekday travel, expect lighter midday traffic with average speeds around 55 mph (89 km/h) .
Journey Waypoints
Ajax
Starting Point
Barnum
Destination