Answer
What is the distance between Seattle. Washington and Boise Idaho:
There are 403.88 miles from Seattle to Boise in southeast direction and 499 miles (803.06 kilometers) by car, following the I-84 route.
Seattle and Boise are 8 hours 4 mins far apart, if you drive non-stop.
This is the fastest route from Seattle, WA to Boise, ID. The halfway point is Umatilla, OR.
Please note the time difference between Seattle, WA and Boise, ID is 1 hour. The current time in Seattle is 12:01 pm and the current time in Boise is 1:01 pm.