There are
1,644 mi
from Bellingham, WA to Watertown, SD
That's the driving distance. It would take 1 day 3 hours to go from Bellingham, Washington to Watertown, South Dakota.
The flight distance (direct flight from Bellingham, WA to Watertown, SD) is 1,222.61 mi.
1,644 mi = 1.61 kms