Air Miles Calculator

Distance between Seattle, WA (BFI) and Helena, MT (HLN)

Distance from Seattle to Helena (Boeing Field – Helena Regional Airport) is 491 miles / 790 kilometers / 427 nautical miles.

How far is Helena from Seattle?

There are several ways to calculate distances between Seattle and Helena. Here are two common methods:

Vincenty's formula (applied above)
  • 490.827 miles
  • 789.909 kilometers
  • 426.517 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
  • 489.424 miles
  • 787.651 kilometers
  • 425.298 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).

Flight duration

Estimated flight time from Boeing Field (BFI) to Helena Regional Airport (HLN) is 1 hour 25 minutes.

Time difference and current local times

The time difference between Seattle and Helena is 1 hour. Helena is 1 hour ahead of Seattle.

Time Difference

Seattle
Helena

Seattle, WA

 PDT

Helena, MT

 MDT

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 98 kg (215 pounds).

Airport information


A Boeing Field
City: Seattle, WA
Country: United States Flag of United States
IATA Code: BFI
ICAO Code: KBFI
Coordinates: 47°31′47″N, 122°18′7″W

B Helena Regional Airport
City: Helena, MT
Country: United States Flag of United States
IATA Code: HLN
ICAO Code: KHLN
Coordinates: 46°36′24″N, 111°58′58″W

Seattle to Helena flight path

Shortest flight path between Boeing Field (BFI) and Helena Regional Airport (HLN).

Frequent Flyer Miles Calculator

Seattle (BFI) → Helena (HLN).

Elite level bonus (%):
Booking class bonus (%):
Air miles:
491
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
491

Round trip?