Best Time to Fly ORD to SUN: On-Time Stats by Hour & Airline
Chicago O'Hare International → Friedman Memorial
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 61.0% of Chicago (ORD) to Sun Valley/Hailey/Ketchum (SUN) flights arrived on time (282 scheduled flights). That is 16.7 points below the national average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (75% on time) and December the worst month (47%).
The cancellation rate was 1.8% (US average 1.8%).
ORD to SUN 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 |
|---|---|---|---|---|
| SkyWest Airlines | 61.0% | 77 min | 1.8% | 282 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to SUN
On-time arrival % by scheduled departure hour (local time), 414 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 67.7% | 0.0% | 165 |
| 9am–10am | 58.7% | 1.8% | 164 |
| 12pm–1pm | Limited data | 1 | |
| 4pm–5pm | 73.8% | 2.3% | 43 |
| 7pm–8pm | 67.5% | 2.4% | 41 |
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 SUN
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Christmas & New Year (Dec 20 - Jan 3) | 55.8% | -8.1 pts | 0.0% | 45 |
| Summer peak (Jun 15 - Aug 15) | 75.8% | +11.9 pts | 1.5% | 67 |
| All other days | 63.9% | — | 1.3% | 302 |
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).