Best Time to Fly BZN to ORD: On-Time Stats by Hour & Airline
Bozeman Yellowstone International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
1,267 flights were scheduled from Bozeman (BZN) to Chicago (ORD) in the last 12 months, and 73.5% of those that flew arrived on time, 4.1 points below the US average of 77.6%.
Among 4 airlines, United Airlines led with 78.8% on time and American Airlines was last with 65.9%.
Over 24 months, Tuesday was the most reliable day (81% on time) and July the worst month (66%).
The cancellation rate was 1.1% (US average 1.8%).
BZN to ORD 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 | 78.8% | 87 min | 1.4% | 689 |
| Envoy Air | 75.6% | 70 min | 0.0% | 41 |
| SkyWest Airlines | 71.0% | 55 min | 0.0% | 69 |
| American Airlines | 65.9% | 98 min | 0.8% | 468 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BZN to ORD
On-time arrival % by scheduled departure hour (local time), 2,263 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 92.1% | 1.7% | 296 |
| 8am–9am | 86.5% | 1.5% | 265 |
| 9am–10am | Limited data | 8 | |
| 10am–11am | 77.5% | 0.0% | 89 |
| 11am–12pm | 64.9% | 0.0% | 37 |
| 12pm–1pm | 78.5% | 0.6% | 845 |
| 1pm–2pm | 58.7% | 0.6% | 364 |
| 2pm–3pm | 59.4% | 0.0% | 69 |
| 3pm–4pm | 80.0% | 0.0% | 30 |
| 4pm–5pm | 66.3% | 0.5% | 200 |
| 5pm–6pm | 62.7% | 1.7% | 60 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BZN to ORD
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) | 71.1% | -8.0 pts | 0.0% | 142 |
| Summer peak (Jun 15 - Aug 15) | 68.4% | -10.8 pts | 1.4% | 564 |
| All other days | 79.1% | — | 0.7% | 1,543 |
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).