Map of flight path and driving directions from Seattle to Ontario.
Shortest flight path between Seattle–Tacoma International Airport (SEA) and Ontario International Airport (ONT).
How far is Ontario from Seattle?
There are several ways to calculate distances between Seattle and Ontario. Here are two common methods:Vincenty's formula (applied above)
- 956.132 miles
- 1538.746 kilometers
- 830.856 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
- 957.141 miles
- 1540.370 kilometers
- 831.733 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
There is no time difference between Seattle and Ontario.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 148 kg (326 pounds).
Frequent Flyer Miles Calculator
Seattle (SEA) → Ontario (ONT).