Best Time to Fly ORD to BIL: On-Time Stats by Hour & Airline
Chicago O'Hare International → Billings Logan International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 88.5% of Chicago (ORD) to Billings (BIL) flights arrived on time (316 scheduled flights). That is 10.9 points above the national average of 77.6%.
Among 2 airlines, Envoy Air led with 89.5% on time and SkyWest Airlines was last with 85.9%.
Over 24 months, Tuesday was the most reliable day (91% on time) and July the worst month (73%).
The cancellation rate was 0.3% (US average 1.8%).
ORD to BIL 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 |
|---|---|---|---|---|
| Envoy Air | 89.5% | 64 min | 0.4% | 230 |
| SkyWest Airlines | 85.9% | 41 min | 0.0% | 86 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to BIL
On-time arrival % by scheduled departure hour (local time), 568 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 89.5% | 0.0% | 68 |
| 9am–10am | 84.0% | 0.0% | 257 |
| 10am–11am | 85.8% | 0.0% | 120 |
| 4pm–5pm | Limited data | 4 | |
| 6pm–7pm | Limited data | 4 | |
| 8pm–9pm | 76.2% | 1.8% | 111 |
| 9pm–10pm | Limited data | 4 | |
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 BIL
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Summer peak (Jun 15 - Aug 15) | 77.7% | -9.6 pts | 0.4% | 248 |
| All other days | 87.4% | — | 0.3% | 320 |
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).