Best Time to Fly GSP to ORD: On-Time Stats by Hour & Airline
Greenville-Spartanburg International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
1,813 flights were scheduled from Greer (GSP) to Chicago (ORD) in the last 12 months, and 76.5% of those that flew arrived on time, 1.1 points below the US average of 77.6%.
Among 5 airlines, PSA Airlines led with 87.0% on time and SkyWest Airlines was last with 72.6%.
Over 24 months, Wednesday was the most reliable day (81% on time) and December the worst month (68%).
The cancellation rate was 4.0% (US average 1.8%).
GSP 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 |
|---|---|---|---|---|
| PSA Airlines | 87.0% | 51 min | 3.1% | 96 |
| Republic Airways | 85.8% | 64 min | 3.5% | 256 |
| American Airlines | 77.5% | 56 min | 9.3% | 54 |
| Envoy Air | 75.1% | 62 min | 3.7% | 813 |
| SkyWest Airlines | 72.6% | 79 min | 4.2% | 593 |
| United Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GSP to ORD
On-time arrival % by scheduled departure hour (local time), 3,227 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 88.4% | 1.4% | 498 |
| 7am–8am | 83.0% | 3.2% | 464 |
| 8am–9am | 83.5% | 3.0% | 200 |
| 9am–10am | 89.6% | 1.6% | 186 |
| 10am–11am | 85.8% | 0.4% | 235 |
| 11am–12pm | 81.9% | 0.7% | 432 |
| 12pm–1pm | 78.8% | 6.5% | 107 |
| 1pm–2pm | 89.2% | 0.0% | 37 |
| 2pm–3pm | Limited data | 3 | |
| 3pm–4pm | 78.0% | 2.4% | 42 |
| 4pm–5pm | 83.0% | 2.1% | 48 |
| 5pm–6pm | 58.9% | 3.4% | 625 |
| 6pm–7pm | 48.8% | 3.7% | 135 |
| 7pm–8pm | 63.9% | 2.7% | 37 |
| 8pm–9pm | 66.7% | 7.6% | 171 |
| 9pm–10pm | Limited data | 4 | |
| 10pm–11pm | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on GSP to ORD
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) | 65.5% | -14.1 pts | 17.9% | 67 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.1% | -13.5 pts | 0.8% | 118 |
| Summer peak (Jun 15 - Aug 15) | 71.3% | -8.3 pts | 1.5% | 663 |
| All other days | 79.6% | — | 2.6% | 2,379 |
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).