From Spokane, WA: East on Interstate 90 towards Idaho. From the Idaho/Washington border, it is 73 miles to Lookout Pass. Lookout is located on I-90 at mile marker 0 (zero). There are signs starting twelve miles before you get to Lookout giving mileage. Follow the signs right into the parking lot. The parking lot is 200 yards from the I-90 off ramp. It will normally take approximately 90 minutes to get to Lookout Pass from downtown Spokane.
From Missoula, MT: West on Interstate 90 towards Idaho. Lookout is located on the Idaho/Montana border at Exit 0 (zero). There is a sign showing the off ramp for Lookout Pass shortly before you get to the Idaho border. The parking lot is 200 yards from the I-90 off ramp. It is 100 miles to Lookout from Downtown Missoula.