Hi all, I am needing to know how long a small private plane, on average, would take to fly from Missoula, MT (MSO) to Centennial airport (APA) on the south side of Denver? Google maps shows it is 900 miles driving distance if that helps at all, and judging by what I estimated as a straight line is right around 700 miles. The disparity comes immediately from having to drive all the way to Billings to get to the interstate.

Thank you in advance for any help here.
Chuck