Air Miles Calculator

Distance between St Louis, MO (STL) and Ontario, CA (ONT)

Flight distance from St Louis to Ontario (St. Louis Lambert International Airport – Ontario International Airport) is 1546 miles / 2488 kilometers / 1343 nautical miles. Estimated flight time is 3 hours 25 minutes.

Driving distance from St Louis (STL) to Ontario (ONT) is 1789 miles / 2879 kilometers and travel time by car is about 29 hours 24 minutes.

Map of flight path and driving directions from St Louis to Ontario.

Shortest flight path between St. Louis Lambert International Airport (STL) and Ontario International Airport (ONT).

How far is Ontario from St Louis?

There are several ways to calculate distances between St Louis and Ontario. Here are two common methods:

Vincenty's formula (applied above)
  • 1545.851 miles
  • 2487.806 kilometers
  • 1343.308 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
  • 1542.599 miles
  • 2482.572 kilometers
  • 1340.482 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 St. Louis Lambert International Airport
City: St Louis, MO
Country: United States Flag of United States
IATA Code: STL
ICAO Code: KSTL
Coordinates: 38°44′55″N, 90°22′12″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

The time difference between St Louis and Ontario is 2 hours. Ontario is 2 hours behind St Louis.

Time Difference

St Louis, MO

 CST

Ontario, CA

 PST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 182 kg (402 pounds).

Frequent Flyer Miles Calculator

St Louis (STL) → Ontario (ONT).

Distance:
1546
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1546

Round trip?