Chicago (ORD) to Boise (BOI): On-Time Performance
Data through July 2026
When you fly ORD to BOI matters as much as anything else about the booking: the route swung from 86% on-time in October 2024 to just 40% in December 2025. Across the full period the route averages 73% on-time against a national 78%. Morning departures also hold up better than evening ones (78% vs 62%), which matters most in the rough months.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 3.0
- last 12 months
- Duration
- 4h 4m
- scheduled
- Distance
- 1,437 mi
Best airline from ORD to BOI
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 81% | 12 min | 0.3% | 364 |
| American Airlines | 78% | 15 min | 0.0% | 203 |
| SkyWest Airlines | 69% | 24 min | 1.5% | 1,164 |
| Envoy Air | 69% | 16 min | 0.0% | 214 |
Monthly on-time trend
Best time to fly from ORD to BOI
Aim for departures around 8 a.m. (83% on-time); avoid 10 a.m. departures (52%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 71% | 21 min |
| Tuesday | 74% | 22 min |
| Wednesday | 73% | 19 min |
| Thursday | 75% | 14 min |
| Friday | 68% | 24 min |
| Saturdaybest | 77% | 14 min |
| Sunday | 70% | 27 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft33%
- Airline operations38%
- National airspace system23%
- Weather5%
Frequently asked questions
- How often are flights from ORD to BOI delayed?
- 28% of ORD–BOI flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 20 minutes.
- Which airline is most reliable from ORD to BOI?
- United Airlines has the best on-time record on this route at 81%, based on 364 flights. 4 airlines flew ORD–BOI frequently enough to compare in this period.
- What is the best time of day to fly from ORD to BOI?
- Departures around 8 a.m. have the best record (83% on-time), while departures around 10 a.m. have the worst (52%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to BOI?
- The scheduled ORD–BOI flight time averages 4h 4m over 1,437 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are ORD to BOI flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ORD to BOI?
- December 2025 was the roughest month in this dataset, with only 40% of arrivals on time. The best was October 2024 at 86%. If your dates are flexible, that 46-point gap is worth planning around.
Explore related pages
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Related guides
Based on 1,945 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.