How far is Ontario, CA, from Helena, MT?
The distance between Helena (Helena Regional Airport) and Ontario (Ontario International Airport) is 915 miles / 1472 kilometers / 795 nautical miles.
The driving distance from Helena (HLN) to Ontario (ONT) is 1133 miles / 1824 kilometers, and travel time by car is about 18 hours 58 minutes.
Helena Regional Airport – Ontario International Airport
Search flights
Distance from Helena to Ontario
There are several ways to calculate the distance from Helena to Ontario. Here are two standard methods:
Vincenty's formula (applied above)- 914.757 miles
- 1472.158 kilometers
- 794.902 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- 915.651 miles
- 1473.597 kilometers
- 795.679 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 Helena to Ontario?
The estimated flight time from Helena Regional Airport to Ontario International Airport is 2 hours and 13 minutes.
What is the time difference between Helena and Ontario?
The time difference between Helena and Ontario is 1 hour. Ontario is 1 hour behind Helena.
Flight carbon footprint between Helena Regional Airport (HLN) and Ontario International Airport (ONT)
On average, flying from Helena to Ontario generates about 145 kg of CO2 per passenger, and 145 kilograms equals 319 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from Helena to Ontario
See the map of the shortest flight path between Helena Regional Airport (HLN) and Ontario International Airport (ONT).
Airport information
| Origin | Helena Regional Airport |
|---|---|
| City: | Helena, MT |
| Country: | United States  |
| IATA Code: | HLN |
| ICAO Code: | KHLN |
| Coordinates: | 46°36′24″N, 111°58′58″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 |