The drive from Lee's Summit to Seattle, Washington, is approximately 2,900 kilometers and takes about 28 hours via I-29 N and I-90 W. This route takes you through Iowa, South Dakota, Montana, Idaho, and Washington. It is a long but straightforward highway drive. Be prepared for changing weather conditions, especially in the mountains.
Total Distance: 2,900 km driving, 2,600 km straight-line.
I-90 can be very busy near Seattle; plan your arrival accordingly.
Summer for outdoor sightseeing.