Distance From Ontario International Airport to Lambert-St. Louis International Airport (ONT - STL Distance)
The flight distance from Ontario International Airport (ONT) to Lambert-St. Louis International Airport (STL) is 1543 miles. This is equivalent to 2483 kilometers or 1340 nautical miles. The distance shown below is the straight line distance (may be called as flying or air distance) or direct flight distance between airports.
2483 kilometers is the distance from Ontario International Airport, United States to Lambert-St. Louis International Airport, United States.
Flight Duration between Ontario, United States and Saint Louis, United States
Estimated flight time from Ontario International Airport, Ontario, United States to Lambert-St. Louis International Airport, Saint Louis, United States is 3 hours 5 minutes under avarage conditions. The flight time calculator assumes an average flight speed for a commercial airliner of 500 mph, which is equivalent to 805 km/hr or 434 knots. Your actual flying time may vary depending on wind speeds or weather conditions.
Time Difference Between the Airports • ONT - STL
Time difference between Ontario (United States) and Saint Louis (United States) is 3 Hours.
Current local time in Ontario is 2025-07-26, 18:34:34 PDT and time in Saint Louis is 2025-07-26, 21:34:34 EDT.
Saint Louis time is 3 Hours ahead of Ontario.
Ontario International Airport to Lambert-St. Louis International Airport Flight Route Map - ONT to STL Flight Path
Location of Ontario International Airport & Lambert-St. Louis International Airport is given below.Click the map to view Ontario to Saint Louis nonstop flight path and travel direction.














Nonstop flight route between Ontario, United States and Saint Louis, United States.
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City: | Ontario |
Country: | United States ![]() |
IATA Code: | ONT |
ICAO Code: | KONT |
GPS Coordinates: | Latitude: N 34° 3' 21.6'' Longitude: W 117° 36' 4.3'' |
Current time: | 2025-07-26, 18:34:34 PDT |
Current weather: |
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City: | Saint Louis |
Country: | United States ![]() |
IATA Code: | STL |
ICAO Code: | KSTL |
GPS Coordinates: | Latitude: N 38° 44' 55.3'' Longitude: W 90° 22' 12.1'' |
Current time: | 2025-07-26, 21:34:34 EDT |
Current weather: |
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Flights: |
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