How far is Ontario, CA, from Great Falls, MT?
The distance between Great Falls (Great Falls International Airport) and Ontario (Ontario International Airport) is 982 miles / 1580 kilometers / 853 nautical miles.
The driving distance from Great Falls (GTF) to Ontario (ONT) is 1220 miles / 1963 kilometers, and travel time by car is about 20 hours 42 minutes.
Great Falls International Airport – Ontario International Airport
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Distance from Great Falls to Ontario
There are several ways to calculate the distance from Great Falls to Ontario. Here are two standard 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 planet.
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).
How long does it take to fly from Great Falls to Ontario?
The estimated flight time from Great Falls International Airport to Ontario International Airport is 2 hours and 21 minutes.
What is the time difference between Great Falls and Ontario?
The time difference between Great Falls and Ontario is 1 hour. Ontario is 1 hour behind Great Falls.
Flight carbon footprint between Great Falls International Airport (GTF) and Ontario International Airport (ONT)
On average, flying from Great Falls to Ontario generates about 150 kg of CO2 per passenger, and 150 kilograms equals 330 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from Great Falls to Ontario
See the map of the shortest flight path between Great Falls International Airport (GTF) and Ontario International Airport (ONT).
Airport information
| Origin | Great Falls International Airport |
|---|---|
| City: | Great Falls, MT |
| Country: | United States  |
| IATA Code: | GTF |
| ICAO Code: | KGTF |
| Coordinates: | 47°28′55″N, 111°22′15″W |
| Destination | Ontario International Airport |
|---|---|
| City: | Ontario, CA |
| Country: | United States |
| IATA Code: | ONT |
| ICAO Code: | KONT |
| Coordinates: | 34°3′21″N, 117°36′3″W |