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Route Reliability

Seattle → Missoula

SEA–MSO · 389 miles · Seattle–Tacoma International Airport to Missoula Montana Airport

86
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
1 min
Average arrival delay
1.3%
Cancelled
1,200
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 85% of the time across 1,200 flights. No comparison to make.

What the data says

Morning-you made the right choice.

SEA–MSO flights departing between 9 AM–12 PM arrived on time 87% of the time, versus 79% between 3–6 PM.

Sunday scaries are real for this one.

SEA–MSO flights arrived on time 88% of the time on Tuesdays. On Sundays: 80%.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon87%(174 flights)
  • Tue88%(170 flights)
  • Wed87%(163 flights)
  • Thu83%(170 flights)
  • Fri84%(170 flights)
  • Sat85%(158 flights)
  • Sun80%(176 flights)
On-time by departure window
  • 9 AM–12 PM87%(365 flights)
  • 12–3 PM83%(316 flights)
  • 3–6 PM79%(158 flights)
  • 9 PM–12 AM86%(342 flights)
On-time trend by month
86%
May

Jun 75% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%119
July 202577%121
August 202578%122
September 202595%98
October 202590%105
November 202583%87
December 202582%92
January 202692%89
February 202692%77
March 202683%82
April 202691%87
May 202686%102

Keep nerding

Based on 1,200 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.