Route Reliability
Chicago → Missoula
ORD–MSO · 1,332 miles · Chicago O'Hare International Airport to Missoula Montana Airport
- 78%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 0.4%
- Cancelled
- 546
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines88%152 flights
- 2.American Airlines74%394 flights
What the data says
Morning-you made the right choice.
ORD–MSO flights departing between 6–9 AM arrived on time 87% of the time, versus 66% between 6–9 PM.
Sunday scaries are real for this one.
ORD–MSO flights arrived on time 89% of the time on Tuesdays and just 71% on Sundays. That gap is worth planning around.
United Airlines runs this route best.
United Airlines arrived on time 88% of the time on this route; American Airlines managed 74%.
Trending in the right direction.
ORD–MSO flights arrived on time 81% of the time over the last three months in the data, compared with 52% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon73%(79 flights)
- Tue89%(72 flights)
- Wed78%(76 flights)
- Thu79%(80 flights)
- Fri72%(76 flights)
- Sat84%(79 flights)
- Sun71%(80 flights)
- 6–9 AM87%(126 flights)
- 9 AM–12 PM78%(302 flights)
- 3–6 PM—(7 flights)
- 6–9 PM66%(107 flights)
Jun 85% → May 98% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 85% | 82 |
| July 2025 | 75% | 91 |
| August 2025 | 74% | 89 |
| September 2025 | 88% | 72 |
| October 2025 | 85% | 34 |
| December 2025 | 31% | 13 |
| January 2026 | 71% | 31 |
| February 2026 | 54% | 28 |
| March 2026 | 67% | 30 |
| April 2026 | 80% | 30 |
| May 2026 | 98% | 42 |
Keep nerding
Based on 546 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.