Best Time to Fly ORD to TYS: On-Time Stats by Hour & Airline
Chicago O'Hare International → McGhee Tyson
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 67.3% of Chicago (ORD) to Knoxville (TYS) flights arrived on time (2,188 scheduled flights). That is 10.3 points below the national average of 77.6%.
Republic Airways was the most punctual of the 5 airlines on the route at 80.8%, while PSA Airlines trailed at 60.5%.
September has been the best month (82% on time) and Thursday the weakest day of the week (68%).
3.8% of flights were cancelled, versus 1.8% nationally.
ORD to TYS 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 |
|---|---|---|---|---|
| Republic Airways | 80.8% | 66 min | 0.0% | 47 |
| Envoy Air | 74.9% | 47 min | 2.4% | 208 |
| SkyWest Airlines | 71.2% | 72 min | 2.4% | 878 |
| United Airlines | 64.7% | 87 min | 1.9% | 312 |
| PSA Airlines | 60.5% | 140 min | 6.7% | 743 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to TYS
On-time arrival % by scheduled departure hour (local time), 4,086 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 1 | |
| 6am–7am | Limited data | 1 | |
| 7am–8am | 81.4% | 0.6% | 505 |
| 8am–9am | 76.2% | 1.9% | 309 |
| 9am–10am | 77.0% | 1.8% | 283 |
| 10am–11am | 79.1% | 1.8% | 400 |
| 11am–12pm | 75.4% | 1.7% | 178 |
| 12pm–1pm | Limited data | 6 | |
| 1pm–2pm | 71.8% | 1.5% | 410 |
| 2pm–3pm | 71.7% | 1.5% | 549 |
| 3pm–4pm | 65.8% | 3.6% | 167 |
| 5pm–6pm | 62.4% | 4.2% | 165 |
| 6pm–7pm | 55.1% | 6.8% | 438 |
| 7pm–8pm | 62.9% | 3.3% | 483 |
| 8pm–9pm | 65.6% | 0.7% | 155 |
| 9pm–10pm | 60.6% | 5.7% | 35 |
| 11pm–12am | 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 TYS
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) | 62.3% | -10.3 pts | 15.9% | 63 |
| Christmas & New Year (Dec 20 - Jan 3) | 63.7% | -8.8 pts | 0.8% | 125 |
| Summer peak (Jun 15 - Aug 15) | 66.9% | -5.7 pts | 2.2% | 902 |
| All other days | 72.5% | — | 2.3% | 2,996 |
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).