Route
GSP → DEN
Greenville-Spartanburg International Airport Denver International Airport
1,278 miles
Return route DEN → GSP →
How punctual is this route?
- On-time arrivals
- 82.2%
- Less than 15 minutes late
- Cancelled
- 1.4%
- Of scheduled flights
- Average delay when late
- 73 min
- Flights arriving 15+ minutes late
- Flights tracked
- 364
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 50%
- Airline (crew, maintenance, cleaning) 28%
- Late-arriving aircraft 17%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 80.0% | 30 |
| October 2025 | 90.3% | 31 |
| November 2025 | 100.0% | 30 |
| December 2025 | 83.3% | 31 |
| January 2026 | 82.1% | 31 |
| February 2026 | 85.7% | 28 |
| March 2026 | 86.2% | 31 |
| April 2026 | 90.0% | 30 |
| May 2026 | 80.6% | 31 |
| June 2026 | 63.3% | 30 |
| July 2026 | 67.9% | 30 |
| August 2026 | 75.9% | 31 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 222 | 80.7% | 0.5% | 83 min |
| SkyWest Airlines | 142 | 84.6% | 2.8% | 54 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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