Best Time to Fly ORD to BOI: On-Time Stats by Hour & Airline
Chicago O'Hare International → Boise Air Terminal
Data through July 2026 · Last updated October 18, 2026
1,108 flights were scheduled from Chicago (ORD) to Boise (BOI) in the last 12 months, and 70.0% of those that flew arrived on time, 7.6 points below the US average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 78.6%, while Envoy Air trailed at 63.5%.
September has been the best month (83% on time) and Friday the weakest day of the week (68%).
1.5% of flights were cancelled, versus 1.8% nationally.
ORD to BOI 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 | 78.6% | 58 min | 0.4% | 245 |
| American Airlines | 78.3% | 63 min | 0.0% | 203 |
| SkyWest Airlines | 64.4% | 84 min | 3.2% | 503 |
| Envoy Air | 63.5% | 51 min | 0.0% | 157 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to BOI
On-time arrival % by scheduled departure hour (local time), 1,883 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 2 | |
| 8am–9am | 82.5% | 0.2% | 500 |
| 9am–10am | 77.2% | 0.0% | 514 |
| 10am–11am | 52.7% | 0.0% | 56 |
| 11am–12pm | 77.9% | 0.0% | 77 |
| 12pm–1pm | Limited data | 6 | |
| 1pm–2pm | Limited data | 4 | |
| 3pm–4pm | Limited data | 11 | |
| 4pm–5pm | 77.1% | 0.0% | 35 |
| 5pm–6pm | Limited data | 2 | |
| 7pm–8pm | 64.1% | 2.1% | 664 |
| 8pm–9pm | Limited data | 11 | |
| 9pm–10pm | Limited data | 1 | |
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 BOI
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) | 54.8% | -19.5 pts | 6.1% | 33 |
| Christmas & New Year (Dec 20 - Jan 3) | 51.2% | -23.2 pts | 0.0% | 88 |
| Summer peak (Jun 15 - Aug 15) | 74.0% | -0.3 pts | 0.8% | 357 |
| All other days | 74.3% | — | 0.8% | 1,405 |
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).