Map of flight path and driving directions from Washington D.C. to Ontario.
Shortest flight path between Ronald Reagan Washington National Airport (DCA) and Ontario International Airport (ONT).
How far is Ontario from Washington D.C.?
There are several ways to calculate distances between Washington D.C. and Ontario. Here are two common methods:Vincenty's formula (applied above)
- 2264.800 miles
- 3644.843 kilometers
- 1968.058 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
- 2259.809 miles
- 3636.810 kilometers
- 1963.720 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
The time difference between Washington D.C. and Ontario is 3 hours. Ontario is 3 hours behind Washington D.C..
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 248 kg (546 pounds).
Frequent Flyer Miles Calculator
Washington D.C. (DCA) → Ontario (ONT).