BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
SEA→MSO

Seattle, WA (SEA) to Missoula, MT (MSO) flight delay odds

81.7% of 591 official scheduled SEA-to-MSO flights arrived on time; 9.5% arrived at least 30 minutes late and 0.8% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
81.7%arrived on time
9.5%30+ min late
0.8%cancelled
591scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.9%all scheduled flights
120+ minutes late1.2%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival-0.6 mincompleted flights

Which departure time was most reliable for SEA to MSO?

Among qualifying SEA-to-MSO departure window results, Afternoon had the highest on-time rate: 82.5% of 309 flights. Night was lowest at 81.4% across 226 flights.

Departure windowFlightsOn time30+ minCancelled
Afternoon30982.5%10.4%1.0%
Night22681.4%8.8%0.9%

Which weekday was most reliable for SEA to MSO?

Among qualifying SEA-to-MSO weekday results, Wednesday had the highest on-time rate: 88.0% of 83 flights. Thursday was lowest at 77.6% across 85 flights.

DayFlightsOn time30+ minCancelled
Monday8878.4%8.0%1.1%
Tuesday8486.9%9.5%0.0%
Wednesday8388.0%7.2%1.2%
Thursday8577.6%10.6%2.4%
Friday8578.8%11.8%1.2%
Saturday7883.3%7.7%0.0%
Sunday8879.5%11.4%0.0%

Which airline was most reliable for SEA to MSO?

Among qualifying SEA-to-MSO airline results, Alaska Airlines had the highest on-time rate: 82.1% of 535 flights. SkyWest Airlines was lowest at 78.6% across 56 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines53582.1%9.7%0.9%
SkyWest Airlines5678.6%7.1%0.0%

Which month was most reliable for SEA to MSO?

Among qualifying SEA-to-MSO month results, September 2025 had the highest on-time rate: 100.0% of 25 flights. August 2025 was lowest at 54.8% across 31 flights.

MonthFlightsOn time30+ minCancelled
July 20253161.3%29.0%0.0%
August 20253154.8%25.8%0.0%
September 202525100.0%0.0%0.0%
October 20253786.5%8.1%0.0%
November 20255979.7%6.8%3.4%
December 20256280.6%16.1%0.0%
January 20266285.5%6.5%3.2%
February 20263994.9%2.6%0.0%
March 20265773.7%8.8%1.8%
April 20266888.2%5.9%0.0%
May 20264393.0%0.0%0.0%
June 20267779.2%10.4%0.0%

What drove SEA to MSO delay minutes?

Late aircraft was the largest recorded SEA-to-MSO delay category, accounting for 41.0% of 4,818 BTS-attributed delay minutes during July 2025–June 2026.

Airline36.6%
Late aircraft41.0%
National airspace12.8%
Weather9.6%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.