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

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

80.3% of 610 official scheduled MSO-to-SEA flights arrived on time; 8.7% arrived at least 30 minutes late and 1.0% 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
80.3%arrived on time
8.7%30+ min late
1.0%cancelled
610scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.1%all scheduled flights
120+ minutes late1.8%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+2.9 mincompleted flights

Which departure time was most reliable for MSO to SEA?

Among qualifying MSO-to-SEA departure window results, Early morning had the highest on-time rate: 87.6% of 226 flights. Afternoon was lowest at 76.1% across 335 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning22687.6%6.2%0.9%
Afternoon33576.1%10.1%1.2%

Which weekday was most reliable for MSO to SEA?

Among qualifying MSO-to-SEA weekday results, Wednesday had the highest on-time rate: 87.2% of 86 flights. Friday was lowest at 72.7% across 88 flights.

DayFlightsOn time30+ minCancelled
Monday9181.3%4.4%1.1%
Tuesday8779.3%4.6%0.0%
Wednesday8687.2%8.1%0.0%
Thursday8883.0%9.1%1.1%
Friday8872.7%15.9%3.4%
Saturday8083.8%5.0%1.2%
Sunday9075.6%13.3%0.0%

Which airline was most reliable for MSO to SEA?

Among qualifying MSO-to-SEA airline results, SkyWest Airlines had the highest on-time rate: 87.0% of 77 flights. Alaska Airlines was lowest at 79.4% across 533 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines53379.4%9.2%1.1%
SkyWest Airlines7787.0%5.2%0.0%

Which month was most reliable for MSO to SEA?

Among qualifying MSO-to-SEA month results, May 2026 had the highest on-time rate: 90.7% of 54 flights. August 2025 was lowest at 51.6% across 31 flights.

MonthFlightsOn time30+ minCancelled
July 20253154.8%22.6%0.0%
August 20253151.6%32.3%0.0%
September 20252572.0%4.0%0.0%
October 20253688.9%0.0%0.0%
November 20255978.0%6.8%3.4%
December 20256173.8%6.6%0.0%
January 20266283.9%4.8%3.2%
February 20263989.7%2.6%0.0%
March 20265778.9%14.0%1.8%
April 20267889.7%6.4%1.3%
May 20265490.7%3.7%0.0%
June 20267784.4%10.4%0.0%

What drove MSO to SEA delay minutes?

Late aircraft was the largest recorded MSO-to-SEA delay category, accounting for 47.2% of 6,120 BTS-attributed delay minutes during July 2025–June 2026.

Airline25.3%
Late aircraft47.2%
National airspace21.6%
Weather5.8%
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.