Idaho Falls (IDA) to Seattle (SEA)
Flight time
≈ 1h 56m
Bearing
302° NW
Idaho Falls (IDA) to Seattle (SEA) is 565 miles (909 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IDA–SEA
US DOT T-100 · filed dataIn April 2026, SkyWest Airlines operated the most departures, one of 2 carriers flying nonstop IDA–SEA; the Embraer E175 was the most common aircraft at 100% of departures; flights ran 81% full.
Departures
120
April 2026
Seats
9,120
both directions
Passengers
7,367
both directions
Load factor
80.8%
passengers ÷ seats
Who flies IDA–SEA?
SkyWest Airlines operated the most nonstop IDA–SEA departures in April 2026 (83), one of 2 carriers on the route.
- OO
SkyWest Airlines
83 departures · 6,308 seats
Share of departures69.2%78.9%
Load
- QX
Horizon Air
37 departures · 2,812 seats
Share of departures30.8%85.1%
Load
What plane flies IDA–SEA?
In April 2026, the Embraer E175 flew 100% of IDA–SEA departures.
- Embraer E175
120 departures · 80.8% load
100.0%
How has IDA–SEA traffic changed?
Nonstop IDA–SEA departures fell from 124 in May 2025 to 120 in April 2026.
Monthly nonstop IDA–SEA traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
124 departures · 8,102 passengers
86.0%
Load
June 2025
120 departures · 8,064 passengers
88.4%
Load
July 2025
122 departures · 8,260 passengers
89.1%
Load
August 2025
124 departures · 8,424 passengers
89.4%
Load
September 2025
120 departures · 8,087 passengers
88.7%
Load
October 2025
124 departures · 7,985 passengers
84.7%
Load
November 2025
116 departures · 6,823 passengers
77.4%
Load
December 2025
109 departures · 6,772 passengers
81.8%
Load
January 2026
124 departures · 7,055 passengers
74.9%
Load
February 2026
110 departures · 6,520 passengers
78.0%
Load
March 2026
119 departures · 7,129 passengers
78.8%
Load
April 2026
120 departures · 7,367 passengers
80.8%
Load
By direction
The DOT files each direction separately — they rarely match.
IDA → SEA
81.6% full
60 departures · 3,720 passengers
SEA → IDA
80.0% full
60 departures · 3,647 passengers
Nonstop IDA–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 Idaho Falls (IDA) from Seattle (SEA)?
IDA to SEA is 565 miles (909 km / 491 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IDA to SEA?
A nonstop covers the 565-mile great-circle distance in roughly 1h 56m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IDA–SEA?
In April 2026, the Embraer E175 flew the largest share of departures (100.0%).
What mileage do I earn flying IDA–SEA?
Distance-based programs credit off the 565-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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