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

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

69.5% of 525 official scheduled MSO-to-ORD flights arrived on time; 17.3% 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 SIGNALVariable
69.5%arrived on time
17.3%30+ min late
1.0%cancelled
525scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.7%all scheduled flights
120+ minutes late4.6%all scheduled flights
Diverted2.1%did not reach as scheduled
Average arrival+13.2 mincompleted flights

Which departure time was most reliable for MSO to ORD?

Among qualifying MSO-to-ORD departure window results, Early morning had the highest on-time rate: 85.6% of 90 flights. Afternoon was lowest at 66.2% across 435 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning9085.6%7.8%1.1%
Afternoon43566.2%19.3%0.9%

Which weekday was most reliable for MSO to ORD?

Among qualifying MSO-to-ORD weekday results, Thursday had the highest on-time rate: 78.9% of 76 flights. Friday was lowest at 61.3% across 75 flights.

DayFlightsOn time30+ minCancelled
Monday7664.5%18.4%1.3%
Tuesday7577.3%14.7%0.0%
Wednesday7270.8%20.8%0.0%
Thursday7678.9%7.9%1.3%
Friday7561.3%25.3%1.3%
Saturday7671.1%13.2%2.6%
Sunday7562.7%21.3%0.0%

Which airline was most reliable for MSO to ORD?

Among qualifying MSO-to-ORD airline results, Envoy Air had the highest on-time rate: 70.5% of 373 flights. United Airlines was lowest at 66.3% across 104 flights.

AirlineFlightsOn time30+ minCancelled
Envoy Air37370.5%17.7%0.3%
United Airlines10466.3%16.3%2.9%
SkyWest Airlines4868.8%16.7%2.1%

Which month was most reliable for MSO to ORD?

Among qualifying MSO-to-ORD month results, May 2026 had the highest on-time rate: 90.5% of 42 flights. July 2025 was lowest at 58.7% across 92 flights.

MonthFlightsOn time30+ minCancelled
July 20259258.7%25.0%1.1%
August 20258965.2%13.5%0.0%
September 20257375.3%9.6%1.4%
October 20253577.1%14.3%0.0%
January 20263167.7%32.3%0.0%
February 20262871.4%14.3%0.0%
March 20263161.3%29.0%0.0%
April 20263070.0%16.7%0.0%
May 20264290.5%2.4%2.4%
June 20266076.7%16.7%3.3%

What drove MSO to ORD delay minutes?

Late aircraft was the largest recorded MSO-to-ORD delay category, accounting for 39.5% of 10,693 BTS-attributed delay minutes during July 2025–June 2026.

Airline18.0%
Late aircraft39.5%
National airspace37.1%
Weather5.4%
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.