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Route Reliability

Missoula → Seattle

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

86
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
3 min
Average arrival delay
1.2%
Cancelled
1,198
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 83% of the time across 1,198 flights. No comparison to make.

What the data says

Morning-you made the right choice.

MSO–SEA flights departing between 6–9 AM arrived on time 92% of the time, versus 71% between 6–9 PM.

Friday is doing you no favors.

MSO–SEA flights arrived on time 89% of the time on Wednesdays and just 73% on Fridays. That gap is worth planning around.

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%(176 flights)
  • Tue84%(170 flights)
  • Wed89%(165 flights)
  • Thu86%(172 flights)
  • Fri73%(168 flights)
  • Sat82%(157 flights)
  • Sun82%(175 flights)
On-time by departure window
  • 6–9 AM92%(354 flights)
  • 12–3 PM86%(357 flights)
  • 3–6 PM75%(325 flights)
  • 6–9 PM71%(147 flights)
On-time trend by month
79%
May

Jun 76% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%120
July 202581%123
August 202576%123
September 202589%98
October 202584%104
November 202583%87
December 202577%92
January 202691%90
February 202691%77
March 202683%81
April 202693%86
May 202679%102

Keep nerding

Based on 1,198 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.