# 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
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
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.

PDT

PDT

## 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?