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

Chicago, IL (ORD) to Missoula, MT (MSO) flight delay odds

76.7% of 524 official scheduled ORD-to-MSO flights arrived on time; 14.3% arrived at least 30 minutes late and 0.6% 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 SIGNALGenerally reliable
76.7%arrived on time
14.3%30+ min late
0.6%cancelled
524scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.5%all scheduled flights
120+ minutes late1.1%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+4.2 mincompleted flights

Which departure time was most reliable for ORD to MSO?

Among qualifying ORD-to-MSO departure window results, Early morning had the highest on-time rate: 86.2% of 152 flights. Evening was lowest at 67.5% across 83 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning15286.2%8.6%1.3%
Late morning28374.2%14.1%0.0%
Evening8367.5%25.3%1.2%

Which weekday was most reliable for ORD to MSO?

Among qualifying ORD-to-MSO weekday results, Tuesday had the highest on-time rate: 88.9% of 72 flights. Friday was lowest at 65.3% across 75 flights.

DayFlightsOn time30+ minCancelled
Monday7673.7%13.2%0.0%
Tuesday7288.9%8.3%0.0%
Wednesday7478.4%13.5%0.0%
Thursday7678.9%14.5%0.0%
Friday7565.3%21.3%2.7%
Saturday7680.3%10.5%1.3%
Sunday7572.0%18.7%0.0%

Which airline was most reliable for ORD to MSO?

Among qualifying ORD-to-MSO airline results, United Airlines had the highest on-time rate: 86.5% of 104 flights. Envoy Air was lowest at 72.8% across 372 flights.

AirlineFlightsOn time30+ minCancelled
Envoy Air37272.8%16.7%0.3%
United Airlines10486.5%7.7%1.0%
SkyWest Airlines4885.4%10.4%2.1%

Which month was most reliable for ORD to MSO?

Among qualifying ORD-to-MSO month results, May 2026 had the highest on-time rate: 97.6% of 42 flights. February 2026 was lowest at 50.0% across 28 flights.

MonthFlightsOn time30+ minCancelled
July 20259273.9%18.5%1.1%
August 20258974.2%15.7%0.0%
September 20257386.3%8.2%1.4%
October 20253485.3%11.8%0.0%
January 20263171.0%25.8%0.0%
February 20262850.0%28.6%0.0%
March 20263158.1%22.6%0.0%
April 20263080.0%10.0%0.0%
May 20264297.6%0.0%0.0%
June 20266088.3%5.0%1.7%

What drove ORD to MSO delay minutes?

National airspace was the largest recorded ORD-to-MSO delay category, accounting for 29.6% of 6,306 BTS-attributed delay minutes during July 2025–June 2026.

Airline23.6%
Late aircraft26.8%
National airspace29.6%
Weather20.1%
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.