How far is Helena, MT, from Seattle, WA?
The distance between Seattle (Seattle–Tacoma International Airport) and Helena (Helena Regional Airport) is 491 miles / 790 kilometers / 427 nautical miles.
The driving distance from Seattle (SEA) to Helena (HLN) is 597 miles / 960 kilometers, and travel time by car is about 10 hours 47 minutes.
Seattle–Tacoma International Airport – Helena Regional Airport
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Distance from Seattle to Helena
There are several ways to calculate the distance from Seattle to Helena. Here are two standard methods:
Vincenty's formula (applied above)- 490.829 miles
- 789.913 kilometers
- 426.519 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- 489.423 miles
- 787.649 kilometers
- 425.297 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 Seattle to Helena?
The estimated flight time from Seattle–Tacoma International Airport to Helena Regional Airport is 1 hour and 25 minutes.
What is the time difference between Seattle and Helena?
The time difference between Seattle and Helena is 1 hour. Helena is 1 hour ahead of Seattle.
Flight carbon footprint between Seattle–Tacoma International Airport (SEA) and Helena Regional Airport (HLN)
On average, flying from Seattle to Helena generates about 97 kg of CO2 per passenger, and 97 kilograms equals 214 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from Seattle to Helena
See the map of the shortest flight path between Seattle–Tacoma International Airport (SEA) and Helena Regional Airport (HLN).
Airport information
| Origin | Seattle–Tacoma International Airport |
|---|---|
| City: | Seattle, WA |
| Country: | United States  |
| IATA Code: | SEA |
| ICAO Code: | KSEA |
| Coordinates: | 47°26′56″N, 122°18′32″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 |