Map of flight path and driving directions from Chicago to Seattle.
Shortest flight path between Chicago O'Hare International Airport (ORD) and Seattle–Tacoma International Airport (SEA).
How far is Seattle from Chicago?
There are several ways to calculate distances between Chicago and Seattle. Here are two common methods:Vincenty's formula (applied above)
- 1720.561 miles
- 2768.975 kilometers
- 1495.127 nautical miles
Vincenty's formula calculates the distance between latitude/longitude points on the earth’s surface, using an ellipsoidal model of the earth.Haversine formula
- 1716.075 miles
- 2761.755 kilometers
- 1491.229 nautical miles
The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance – the shortest distance between two points).
Time difference and current local times
The time difference between Chicago and Seattle is 2 hours. Seattle is 2 hours behind Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 194 kg (428 pounds).
Frequent Flyer Miles Calculator
Chicago (ORD) → Seattle (SEA).