The trip from Cascade Locks to Seattle is a 300-kilometer drive. You will primarily use I-84 West to Portland and then connect to I-5 North to reach Seattle. The drive typically takes about 3.5 to 4 hours depending on traffic. This route is a popular journey for those traveling between the Columbia River Gorge and the Puget Sound area. You will pass through the scenic landscape of the Gorge and the urban centers of Portland and Olympia before arriving in Seattle.
Total Distance: 300 km driving, 250 km air distance.
Watch for heavy traffic on I-5 near Portland and Seattle during rush hour.
Anytime, but summer offers the best visibility for the gorge scenery.