Route on-time record
MSO to ORD: most on-time flights and the best time to fly
Missoula (Missoula Montana Airport) to Chicago (Chicago O'Hare International Airport). 546 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 0.5% were cancelled. The most reliable flight number was Envoy 3718 at 1:19 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
MSO → ORD
Missoula to Chicago: 546 nonstop flights a year
On time (12 months)
72%
Cancelled
0.5%
avg delay 20 min
Best time to leave
Before 9 AM
86% on time vs 69% noon to 3 PM
Most reliable airline
United
73% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Envoy 3718 · sold as American Eagle
1:19 PM → 6:03 PM3h 44m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 86%).
- Lands inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 11 flights
Find 1:19 PM flight fares Opens this date on Aviasales#2 · United 636
12:34 PM → 5:05 PM3h 31m nonstop
Local times, typical schedule. Last flown 2026-05-31.
74%
chance on time
- On time (history)
- 100%
- Cancelled
- 9.1%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (9 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 86%).
- Lands inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 9 flights
Find United 636 fares Opens this date on Aviasales#3 · Envoy 4199 · sold as American Eagle
1:08 PM → 5:51 PM3h 43m nonstop
Local times, typical schedule. Last flown 2026-05-20.
70%
chance on time
- On time (history)
- 69%
- Cancelled
- 0.0%
- Avg arrival delay
- 25 min
- Arrived on time 69% of the time (152 flights, Jun 2025 to May 2026).
- Never cancelled in 154 scheduled flights.
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 86%).
- Lands inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 152 flights
Find 1:08 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines73%
104 flights · 74% on time as flown · 0.7% cancel
- Envoy Air (sold as American Eagle)72%
394 flights · 72% on time as flown · 0.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM86%
115 flights · avg delay 15 min
- Noon to 3 PM69%
431 flights · avg delay 22 min
Best day: Thursday (82%). Worst: Sunday (67%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft37%
- Air traffic control and airport volume30%
- Airline (crew, maintenance, boarding)27%
- Severe weather6%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
MSO to ORD questions
- What time of day is best to fly MSO to ORD?
- Before 9 AM: 86% of flights arrived on time, against 69% for departures noon to 3 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from MSO to ORD?
- United, with a season-adjusted 73% chance of operating and arriving on time over 104 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on MSO to ORD?
- March (61% on time); the best was May (92%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from MSO
- ORD to MSO (return)
- MSO to DEN 80%
- MSO to SLC 90%
- MSO to SEA 80%
- MSO to MSP 91%
- MSO to DFW 82%
Live status: FAA delays and ground stops