Helena (HLN) to Seattle (SEA)
Flight time
≈ 1h 47m
Bearing
281° W
Helena (HLN) to Seattle (SEA) is 489 miles (788 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies HLN–SEA
US DOT T-100 · filed dataIn April 2026, Horizon Air was the only carrier flying nonstop HLN–SEA; the Embraer E175 was the most common aircraft at 100% of departures; flights ran 69% full.
Departures
60
April 2026
Seats
4,560
both directions
Passengers
3,127
both directions
Load factor
68.6%
passengers ÷ seats
Who flies HLN–SEA?
Horizon Air was the only carrier to fly nonstop HLN–SEA in April 2026 (60 departures).
- QX
Horizon Air
60 departures · 4,560 seats
Share of departures100.0%68.6%
Load
What plane flies HLN–SEA?
In April 2026, the Embraer E175 flew 100% of HLN–SEA departures.
- Embraer E175
60 departures · 68.6% load
100.0%
How has HLN–SEA traffic changed?
Nonstop HLN–SEA departures fell from 62 in May 2025 to 60 in April 2026.
Monthly nonstop HLN–SEA traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
62 departures · 3,887 passengers
82.5%
Load
June 2025
60 departures · 4,058 passengers
89.0%
Load
July 2025
62 departures · 4,079 passengers
86.6%
Load
August 2025
62 departures · 4,053 passengers
86.0%
Load
September 2025
60 departures · 3,805 passengers
83.4%
Load
October 2025
62 departures · 3,311 passengers
70.3%
Load
November 2025
58 departures · 2,750 passengers
62.4%
Load
December 2025
61 departures · 3,350 passengers
72.3%
Load
January 2026
62 departures · 2,836 passengers
60.2%
Load
February 2026
56 departures · 2,897 passengers
68.1%
Load
March 2026
58 departures · 3,102 passengers
70.4%
Load
April 2026
60 departures · 3,127 passengers
68.6%
Load
By direction
The DOT files each direction separately — they rarely match.
HLN → SEA
65.4% full
30 departures · 1,492 passengers
SEA → HLN
71.7% full
30 departures · 1,635 passengers
Nonstop HLN–SEA traffic has been filed with the US DOT since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through April 2026; filings from 2025. Public domain (US Government work). The DOT publishes roughly three months in arrears.
The airports
Frequently asked
How far is Helena (HLN) from Seattle (SEA)?
HLN to SEA is 489 miles (788 km / 425 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from HLN to SEA?
A nonstop covers the 489-mile great-circle distance in roughly 1h 47m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies HLN–SEA?
In April 2026, the Embraer E175 flew the largest share of departures (100.0%).
What mileage do I earn flying HLN–SEA?
Distance-based programs credit off the 489-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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