How far is Seattle, WA, from Helena, MT?
The distance between Helena (Helena Regional Airport) and Seattle (Seattle–Tacoma International Airport) is 491 miles / 790 kilometers / 427 nautical miles.
The driving distance from Helena (HLN) to Seattle (SEA) is 597 miles / 960 kilometers, and travel time by car is about 10 hours 49 minutes.
Helena Regional Airport – Seattle–Tacoma International Airport
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Distance from Helena to Seattle
There are several ways to calculate the distance from Helena to Seattle. 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 Helena to Seattle?
The estimated flight time from Helena Regional Airport to Seattle–Tacoma International Airport is 1 hour and 25 minutes.
What is the time difference between Helena and Seattle?
The time difference between Helena and Seattle is 1 hour. Seattle is 1 hour behind Helena.
Flight carbon footprint between Helena Regional Airport (HLN) and Seattle–Tacoma International Airport (SEA)
On average, flying from Helena to Seattle 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 Helena to Seattle
See the map of the shortest flight path between Helena Regional Airport (HLN) and Seattle–Tacoma International Airport (SEA).
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 | 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 |
Airlines flying from Helena (HLN) to Seattle (SEA)
| Alaska Airlines |