Air Miles Calculator

Distance between Seattle, WA (SEA) and Ontario, CA (ONT)

Flight distance from Seattle to Ontario (Seattle–Tacoma International Airport – Ontario International Airport) is 956 miles / 1539 kilometers / 831 nautical miles. Estimated flight time is 2 hours 18 minutes.

Driving distance from Seattle (SEA) to Ontario (ONT) is 1162 miles / 1870 kilometers and travel time by car is about 20 hours 42 minutes.

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).

Airport information


A Seattle–Tacoma International Airport
City: Seattle, WA
Country: United States Flag of United States
IATA Code: SEA
ICAO Code: KSEA
Coordinates: 47°26′56″N, 122°18′32″W

B Ontario International Airport
City: Ontario, CA
Country: United States Flag of United States
IATA Code: ONT
ICAO Code: KONT
Coordinates: 34°3′21″N, 117°36′3″W

Time difference and current local times

There is no time difference between Seattle and Ontario.

Time Difference

Seattle, WA

 PST

Ontario, CA

 PST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 148 kg (326 pounds).

Frequent Flyer Miles Calculator

Seattle (SEA) → Ontario (ONT).

Distance:
956
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
956

Round trip?