How far is Helena, MT, from Porto?
The distance between Porto (Porto Airport) and Helena (Helena Regional Airport) is 4772 miles / 7680 kilometers / 4147 nautical miles.
Porto Airport – Helena Regional Airport
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Distance from Porto to Helena
There are several ways to calculate the distance from Porto to Helena. Here are two standard methods:
Vincenty's formula (applied above)- 4772.153 miles
- 7680.035 kilometers
- 4146.887 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- 4759.429 miles
- 7659.558 kilometers
- 4135.830 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 Porto to Helena?
The estimated flight time from Porto Airport to Helena Regional Airport is 9 hours and 32 minutes.
What is the time difference between Porto and Helena?
The time difference between Porto and Helena is 6 hours. Helena is 6 hours behind Porto.
Flight carbon footprint between Porto Airport (OPO) and Helena Regional Airport (HLN)
On average, flying from Porto to Helena generates about 554 kg of CO2 per passenger, and 554 kilograms equals 1 222 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path from Porto to Helena
See the map of the shortest flight path between Porto Airport (OPO) and Helena Regional Airport (HLN).
Airport information
| Origin | Porto Airport |
|---|---|
| City: | Porto |
| Country: | Portugal  |
| IATA Code: | OPO |
| ICAO Code: | LPPR |
| Coordinates: | 41°14′53″N, 8°40′53″W |
| Destination | Helena Regional Airport |
|---|---|
| City: | Helena, MT |
| Country: | United States  |
| IATA Code: | HLN |
| ICAO Code: | KHLN |
| Coordinates: | 46°36′24″N, 111°58′58″W |