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About five hours, not including any waiting time at the border.
The approximate driving time and mileage information - Between: Kalispell, MT and: Great Falls, MT Driving miles: 225 Driving time: 4 hrs - is based on traveling non-stop in good driving conditions. Driving time does not take into consideration conditions which may extend travel time such as weather, road work, border crossings, and rush hour traffic in urban areas. Mileage denotes actual road miles covered as opposed to Point A to Point B linear distances on a map.
The driving distance from Great Falls, Montana to Helena, Montana is 90 miles via I-15 S per MapQuest. The driving time per MapQuest is 1 hour and 28 minutes.
The driving distance from Great Falls, Montana to Power, Montana is 25 miles via I-15 N per MapQuest. The driving time per MapQuest is 28 minutes.
The driving distance between Kalispell, MT and Great Falls, MT is approximately 230 miles. The driving time would be approximately 4 hours 15 minutes if you were to travel non-stop in good driving conditions. (The driving time does not take into consideration conditions which may extend trip time such as weather, road work and rush hour traffic in urban areas.)
The driving distance from Kalispell, Montana to Great Falls, Montana is 226 miles via I-15 S per MapQuest. The driving time per MapQuest is 3 hours and 40 minutes.
The driving distance from Great Falls, Montana to Cedar City, Utah is 820 miles via I-15 S per MapQuest. The driving time per MapQuest is 11 hours and 6 minutes.
The driving distance between Las Vegas, NV and Niagara Falls, NY is approximately 2295 miles. The driving time would be approximately 36 hours if you were to travel non-stop in good driving conditions. (The driving time does not take into consideration conditions which may extend trip time such as weather, road work, border crossings and rush hour traffic in urban areas.)
The driving distance between Vancouver, BC, Canada and Great Falls, MT is 1306 km. The driving time would be approximately 13 hours 15 minutes if driving 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.)
Google Maps estimates the driving time as 16.5 hours.
The driving distance between Las Vegas, NV and Idaho Falls, ID is approximately 635 miles. The driving time would be approximately 10 hours if you were to travel non-stop in good driving conditions. (The driving time does not take into consideration conditions which may extend trip time such as weather, road work, border crossings and rush hour traffic in urban areas.)
It is 1,222.79 miles according to MapQuest and requires about 19 hours of driving time.