Best Time to Fly GSP to DEN: On-Time Stats by Hour & Airline
Greenville-Spartanburg International → Denver International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 81.2% of Greer (GSP) to Denver (DEN) flights arrived on time (366 scheduled flights). That is 3.6 points above the national average of 77.6%.
Among 2 airlines, SkyWest Airlines led with 84.6% on time and United Airlines was last with 79.5%.
Over 24 months, Saturday was the most reliable day (84% on time) and July the worst month (60%).
The cancellation rate was 1.1% (US average 1.8%).
GSP to DEN 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 | 84.6% | 48 min | 2.8% | 142 |
| United Airlines | 79.5% | 77 min | 0.0% | 222 |
| Southwest Airlines | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly GSP to DEN
On-time arrival % by scheduled departure hour (local time), 749 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | Limited data | 2 | |
| 2pm–3pm | Limited data | 9 | |
| 3pm–4pm | Limited data | 1 | |
| 4pm–5pm | 81.0% | 1.0% | 728 |
| 5pm–6pm | Limited data | 9 | |
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 DEN
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) | Limited data | 14 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 30 | ||
| Summer peak (Jun 15 - Aug 15) | 63.1% | -20.3 pts | 0.0% | 140 |
| All other days | 83.4% | — | 1.2% | 565 |
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).