About 565 miles.
The driving distance from Missoula, Montana to Casper, Wyoming is 619 miles via I-90 E per MapQuest. The driving time per MapQuest is 8 hours and 15 minutes.
The driving distance from Rock Springs, Wyoming to Dallas, Texas is 1,220 miles.
The driving distance from Albuquerque New Mexico to Rock Springs Wyoming is 799 miles via I-25 North per MapQuest. The driving time per MapQuest is 11 hours and 8 minutes.
About 170 miles.
The driving distance from Buffalo, Wyoming to Cody, Wyoming is about 185 miles. According to Google Maps, the driving distance from Buffalo, Wyoming to Cody, Wyoming is 183 miles traveling on I-90W and US-14W.
178.6 miles
The driving distance is about 765 miles to the WY state line.
Distance: 165.63 miles - Time: 3:40 h
It is 244.87 miles according to MapQuest.
About 1,050km
The driving distance between Casper, WY and Rock Springs, WY is 225 miles. The driving time would be approximately 8 hours if you were to drive non-stop in good conditions. (The driving time does not take into consideration conditions such as weather, road work and rush hour traffic in urban areas.)
The driving distance is about 795 miles.