Best Time to Fly ORD to BZN: On-Time Stats by Hour & Airline
Chicago O'Hare International → Bozeman Yellowstone International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 69.1% of Chicago (ORD) to Bozeman (BZN) flights arrived on time (1,268 scheduled flights). That is 8.6 points below the national average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 72.2%, while Envoy Air trailed at 55.0%.
November has been the best month (89% on time) and Friday the weakest day of the week (62%).
0.8% of flights were cancelled, versus 1.8% nationally.
ORD to BZN on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 72.2% | 69 min | 1.0% | 689 |
| SkyWest Airlines | 72.1% | 64 min | 0.0% | 69 |
| American Airlines | 65.2% | 64 min | 0.6% | 469 |
| Envoy Air | 55.0% | 31 min | 0.0% | 41 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to BZN
On-time arrival % by scheduled departure hour (local time), 2,264 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 83.2% | 0.0% | 90 |
| 8am–9am | 63.8% | 0.0% | 48 |
| 9am–10am | 82.6% | 0.5% | 835 |
| 10am–11am | 66.8% | 0.2% | 403 |
| 11am–12pm | 75.0% | 0.0% | 60 |
| 12pm–1pm | 73.6% | 0.0% | 110 |
| 1pm–2pm | 61.7% | 0.7% | 151 |
| 3pm–4pm | 78.0% | 0.0% | 51 |
| 4pm–5pm | 70.3% | 0.0% | 91 |
| 5pm–6pm | Limited data | 1 | |
| 6pm–7pm | Limited data | 1 | |
| 7pm–8pm | 49.7% | 3.1% | 193 |
| 8pm–9pm | 55.4% | 1.4% | 208 |
| 9pm–10pm | Limited data | 22 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD to BZN
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 58.2% | -16.0 pts | 0.0% | 142 |
| Summer peak (Jun 15 - Aug 15) | 67.6% | -6.6 pts | 1.2% | 564 |
| All other days | 74.2% | — | 0.5% | 1,544 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).