Best Time to Fly SUN to ORD: On-Time Stats by Hour & Airline
Friedman Memorial → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 60.1% of Sun Valley/Hailey/Ketchum (SUN) to Chicago (ORD) flights arrived on time (281 scheduled flights). That is 17.5 points below the national average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (78% on time) and March the worst month (54%).
The cancellation rate was 4.6% (US average 1.8%).
SUN 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 |
|---|---|---|---|---|
| SkyWest Airlines | 60.1% | 93 min | 4.6% | 281 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SUN to ORD
On-time arrival % by scheduled departure hour (local time), 413 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 83.2% | 2.1% | 93 |
| 12pm–1pm | 64.6% | 0.5% | 211 |
| 1pm–2pm | 49.5% | 10.2% | 108 |
| 4pm–5pm | 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 SUN to ORD
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) | 58.5% | -3.7 pts | 6.7% | 45 |
| Summer peak (Jun 15 - Aug 15) | 82.5% | +20.3 pts | 1.5% | 66 |
| All other days | 62.3% | — | 3.3% | 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).