Missoula (MSO) to Seattle (SEA)
Flight time
≈ 1h 35m
Bearing
278° W
Missoula (MSO) to Seattle (SEA) is 388 miles (624 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies MSO–SEA
US DOT T-100 · filed dataIn April 2026, Alaska Airlines operated the most departures, one of 3 carriers flying nonstop MSO–SEA; the Embraer E175 was the most common aircraft at 46% of departures; flights ran 70% full.
Departures
173
April 2026
Seats
20,406
both directions
Passengers
14,330
both directions
Load factor
70.2%
passengers ÷ seats
Who flies MSO–SEA?
Alaska Airlines operated the most nonstop MSO–SEA departures in April 2026 (94), one of 3 carriers on the route.
- AS
Alaska Airlines
94 departures · 14,402 seats
Share of departures54.3%64.3%
Load
- OO
SkyWest Airlines
51 departures · 3,876 seats
Share of departures29.5%85.2%
Load
- QX
Horizon Air
28 departures · 2,128 seats
Share of departures16.2%83.2%
Load
What plane flies MSO–SEA?
In April 2026, the Embraer E175 flew 46% of MSO–SEA departures — more than any other aircraft type.
- Embraer E175
79 departures · 84.5% load
45.7% - Boeing 737-700
36 departures · 78.6% load
20.8% - Boeing 737-900ER
24 departures · 56.4% load
13.9% - Boeing 737-800
16 departures · 59.9% load
9.3% - Boeing 737 MAX 9
12 departures · 58.0% load
6.9% - Boeing 737 MAX 8
6 departures · 58.3% load
3.5%
How has MSO–SEA traffic changed?
Nonstop MSO–SEA departures fell from 214 in May 2025 to 173 in April 2026.
Monthly nonstop MSO–SEA traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
214 departures · 17,014 passengers
78.9%
Load
June 2025
239 departures · 18,041 passengers
76.5%
Load
July 2025
245 departures · 19,971 passengers
81.3%
Load
August 2025
246 departures · 19,173 passengers
77.0%
Load
September 2025
196 departures · 15,185 passengers
76.9%
Load
October 2025
209 departures · 16,003 passengers
77.1%
Load
November 2025
175 departures · 14,838 passengers
65.9%
Load
December 2025
185 departures · 16,666 passengers
68.6%
Load
January 2026
180 departures · 14,928 passengers
63.7%
Load
February 2026
154 departures · 13,326 passengers
72.0%
Load
March 2026
164 departures · 15,121 passengers
77.6%
Load
April 2026
173 departures · 14,330 passengers
70.2%
Load
By direction
The DOT files each direction separately — they rarely match.
SEA → MSO
72.7% full
87 departures · 7,442 passengers
MSO → SEA
67.8% full
86 departures · 6,888 passengers
Nonstop MSO–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 Missoula (MSO) from Seattle (SEA)?
MSO to SEA is 388 miles (624 km / 337 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from MSO to SEA?
A nonstop covers the 388-mile great-circle distance in roughly 1h 35m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies MSO–SEA?
In April 2026, the Embraer E175 flew the largest share of departures (45.7%), followed by the Boeing 737-700 (20.8%).
What mileage do I earn flying MSO–SEA?
Distance-based programs credit off the 388-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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