Missoula (MSO) to Chicago (ORD): On-Time Performance
Data through July 2026
Missoula (MSO) to Chicago (ORD) effectively runs on two schedules. In May 2026, 93% of arrivals were on time; in July 2025 that fell to 59% — a 33-point seasonal swing. Across the full period the route averages 73% on-time against a national 78%.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 1.4
- last 12 months
- Duration
- 3h 28m
- scheduled
- Distance
- 1,332 mi
Best airline from MSO to ORD
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 80% | 14 min | 1.1% | 91 |
| United Airlines | 76% | 21 min | 1.3% | 224 |
| Envoy Air | 71% | 22 min | 0.2% | 553 |
Monthly on-time trend
Best time to fly from MSO to ORD
Aim for departures around 5 a.m. (90% on-time); avoid 12 p.m. departures (70%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 69% | 17 min |
| Tuesday | 75% | 24 min |
| Wednesday | 75% | 21 min |
| Thursdaybest | 83% | 9 min |
| Friday | 67% | 29 min |
| Saturday | 75% | 23 min |
| Sunday | 68% | 22 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft38%
- Airline operations21%
- National airspace system36%
- Weather4%
Frequently asked questions
- How often are flights from MSO to ORD delayed?
- 27% of MSO–ORD flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 21 minutes.
- Which airline is most reliable from MSO to ORD?
- SkyWest Airlines has the best on-time record on this route at 80%, based on 91 flights. 3 airlines flew MSO–ORD frequently enough to compare in this period.
- What is the best time of day to fly from MSO to ORD?
- Departures around 5 a.m. have the best record (90% on-time), while departures around 12 p.m. have the worst (70%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MSO to ORD?
- The scheduled MSO–ORD flight time averages 3h 28m over 1,332 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are MSO to ORD flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from MSO to ORD?
- July 2025 was the roughest month in this dataset, with only 59% of arrivals on time. The best was May 2026 at 93%. If your dates are flexible, that 33-point gap is worth planning around.
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Based on 868 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.