Miles between Longmont, CO and Seatac, WA

There are
1,286 mi
from Longmont, CO to Seatac, WA

That's the driving distance. It would take 22 hours 20 mins to go from Longmont, Colorado to Seatac, Washington.

The flight distance (direct flight from Longmont, CO to Seatac, WA) is 992.08 mi.

1,286 mi = 1.61 kms