Air Miles Calculator

Distance between Great Falls, MT (GTF) and Ontario, CA (ONT)

Flight distance from Great Falls to Ontario (Great Falls International Airport – Ontario International Airport) is 982 miles / 1580 kilometers / 853 nautical miles. Estimated flight time is 2 hours 21 minutes.

Driving distance from Great Falls (GTF) to Ontario (ONT) is 1220 miles / 1964 kilometers and travel time by car is about 20 hours 14 minutes.

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).

Airport information


A Great Falls International Airport
City: Great Falls, MT
Country: United States Flag of United States
IATA Code: GTF
ICAO Code: KGTF
Coordinates: 47°28′55″N, 111°22′15″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 Great Falls and Ontario is 1 hour. Ontario is 1 hour behind Great Falls.

Time Difference

Great Falls, MT

 MST

Ontario, CA

 PST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 150 kg (330 pounds).

Frequent Flyer Miles Calculator

Great Falls (GTF) → Ontario (ONT).

Distance:
982
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
982

Round trip?