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
Filed traffic dataIn June 2026, Alaska Airlines operated the most departures, one of 3 carriers flying nonstop MSO–SEA; the Embraer E175 was the most common aircraft at 49% of departures; flights ran 75% full.
Departures
220
June 2026
Seats
25,811
both directions
Passengers
19,445
both directions
Load factor
75.3%
RPM ÷ ASM
Who flies MSO–SEA?
Alaska Airlines operated the most nonstop MSO–SEA departures in June 2026 (112), one of 3 carriers on the route.
- AS
112 departures · 17,603 seats
Share of departures50.9%71.4%
Load
- QX
66 departures · 5,016 seats
Share of departures30.0%80.8%
Load
- OO
42 departures · 3,192 seats
Share of departures19.1%88.3%
Load
What plane flies MSO–SEA?
In June 2026, the Embraer E175 flew 49% of MSO–SEA departures — more than any other aircraft type.
- Embraer E175
108 departures · 83.7% load
49.1% - Boeing 737-800
53 departures · 72.2% load
24.1% - Boeing 737-700
24 departures · 87.9% load
10.9% - Boeing 737-900ER
16 departures · 58.5% load
7.3% - Boeing 737 MAX 9
11 departures · 65.7% load
5.0% - Boeing 737 MAX 8
8 departures · 65.6% load
3.6%
How has MSO–SEA traffic changed?
Nonstop MSO–SEA departures fell from 245 in July 2025 to 220 in June 2026.
Monthly nonstop MSO–SEA traffic, trailing 12 months through June 2026. Bars scale to the busiest month; months with no filed service show as zero.
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
May 2026
205 departures · 17,005 passengers
71.8%
Load
June 2026
220 departures · 19,445 passengers
75.3%
Load
By direction
Each direction is filed separately — they rarely match.
MSO → SEA
74.1% full
110 departures · 9,567 passengers
SEA → MSO
76.6% full
110 departures · 9,878 passengers
Nonstop MSO–SEA traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through June 2026; filings from 2025. Public domain (US Government work).
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 June 2026, the Embraer E175 flew the largest share of departures (49.1%), followed by the Boeing 737-800 (24.1%).
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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