It is 1,257 miles according to Google Maps.
South Dakota
The air distance from Mount Rushmore, South Dakota, to Seattle, Washington, is 946 miles. That equals 1,522 kilometers or 822 nautical miles.
If you're driving, the halfway point is on I-90 in South Dakota, just east of the Missouri River. The nearest town is Kimball, SD.
The halfway driving distance point from Seattle, Washington, to Jacksonville, Florida, is Montrose, South Dakota. The total driving distance from Seattle to Jacksonville is 2,993 miles, which equals 4,817 kilometers.
Sioux Falls, South Dakota
According to Google Maps; the distance between Seattle, Wash and Sioux Falls, SD is 1,490 miles. The hallway city, (using the suggested Google Map route), is Greycliff, Montana at 747 miles or 11 hours 38 minutes driving time.
About 1,467 miles.
Google Maps estimates the driving time as 18 hours, 57 minutes and gives the distance as 1,233 miles.
It is 1,149.62 miles according to MapQuest.
Montana and Idaho are located between Bismarck, North Dakota and Olympia, Washington.
It is 1,233 miles according to Google Maps