Map of flight path and driving directions from Great Falls to Ontario.
Shortest flight path between Great Falls International Airport (GTF) and Ontario International Airport (ONT).
How far is Ontario from Great Falls?
There are several ways to calculate distances between Great Falls and Ontario. Here are two common methods:Vincenty's formula (applied above)
- 981.570 miles
- 1579.683 kilometers
- 852.961 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
- 982.439 miles
- 1581.083 kilometers
- 853.717 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 Great Falls and Ontario is 1 hour. Ontario is 1 hour behind Great Falls.
Great Falls, MT
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 150 kg (330 pounds).
Frequent Flyer Miles Calculator
Great Falls (GTF) → Ontario (ONT).