Boise (BOI) to Seattle (SEA)
Flight time
≈ 1h 36m
Bearing
314° NW
Boise (BOI) to Seattle (SEA) is 398 miles (641 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies BOI–SEA
Filed traffic dataIn May 2026, SkyWest Airlines operated the most departures, one of 3 carriers flying nonstop BOI–SEA; the Embraer E175 was the most common aircraft at 80% of departures; flights ran 79% full.
Departures
919
May 2026
Seats
86,335
both directions
Passengers
68,178
both directions
Load factor
79.0%
RPM ÷ ASM
Who flies BOI–SEA?
SkyWest Airlines operated the most nonstop BOI–SEA departures in May 2026 (546), one of 3 carriers on the route.
- OO
546 departures · 40,788 seats
Share of departures59.4%80.6%
Load
- QX
187 departures · 14,212 seats
Share of departures20.3%91.2%
Load
- AS
186 departures · 31,335 seats
Share of departures20.2%71.3%
Load
What plane flies BOI–SEA?
In May 2026, the Embraer E175 flew 80% of BOI–SEA departures — more than any other aircraft type.
- Embraer E175
733 departures · 83.4% load
79.8% - Boeing 737-800
82 departures · 73.8% load
8.9% - Boeing 737 MAX 9
42 departures · 62.9% load
4.6% - Boeing 737-900ER
41 departures · 69.6% load
4.5% - Boeing 737 MAX 8
21 departures · 83.6% load
2.3%
How has BOI–SEA traffic changed?
Nonstop BOI–SEA departures fell from 1,005 in June 2025 to 919 in May 2026.
Monthly nonstop BOI–SEA traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
June 2025
1,005 departures · 70,016 passengers
81.0%
Load
July 2025
1,034 departures · 70,877 passengers
79.2%
Load
August 2025
1,009 departures · 66,989 passengers
76.5%
Load
September 2025
962 departures · 63,869 passengers
76.6%
Load
October 2025
918 departures · 65,959 passengers
82.5%
Load
November 2025
808 departures · 55,489 passengers
76.8%
Load
December 2025
887 departures · 62,162 passengers
79.3%
Load
January 2026
818 departures · 55,004 passengers
71.1%
Load
February 2026
743 departures · 51,267 passengers
74.8%
Load
March 2026
904 departures · 63,029 passengers
73.8%
Load
April 2026
894 departures · 54,567 passengers
65.1%
Load
May 2026
919 departures · 68,178 passengers
79.0%
Load
By direction
Each direction is filed separately — they rarely match.
BOI → SEA
84.7% full
460 departures · 36,570 passengers
SEA → BOI
73.2% full
459 departures · 31,608 passengers
Nonstop BOI–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Boise (BOI) from Seattle (SEA)?
BOI to SEA is 398 miles (641 km / 346 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from BOI to SEA?
A nonstop covers the 398-mile great-circle distance in roughly 1h 36m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies BOI–SEA?
In May 2026, the Embraer E175 flew the largest share of departures (79.8%), followed by the Boeing 737-800 (8.9%).
What mileage do I earn flying BOI–SEA?
Distance-based programs credit off the 398-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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