Greer (GSP) to Denver (DEN): On-Time Performance
Data through July 2026
The calendar drives reliability on GSP–DEN. November 2025 flights landed on schedule 100% of the time, but July 2025 dropped to 49% — a gap of 51 points. Across the full period the route averages 78% on-time against a national 78%.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 1.0
- last 12 months
- Duration
- 3h 42m
- scheduled
- Distance
- 1,278 mi
Best airline from GSP to DEN
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 84% | 11 min | 1.5% | 467 |
| United Airlines | 73% | 21 min | 0.0% | 293 |
Monthly on-time trend
Best time to fly from GSP to DEN
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 14 min |
| Tuesday | 82% | 15 min |
| Wednesday | 77% | 14 min |
| Thursday | 75% | 18 min |
| Friday | 79% | 15 min |
| Saturdaybest | 83% | 11 min |
| Sunday | 72% | 21 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft18%
- Airline operations22%
- National airspace system55%
- Weather5%
Frequently asked questions
- How often are flights from GSP to DEN delayed?
- 22% of GSP–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from GSP to DEN?
- SkyWest Airlines has the best on-time record on this route at 84%, based on 467 flights. 2 airlines flew GSP–DEN frequently enough to compare in this period.
- How long is the flight from GSP to DEN?
- The scheduled GSP–DEN flight time averages 3h 42m over 1,278 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are GSP to DEN flights cancelled?
- 0.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from GSP to DEN?
- July 2025 was the roughest month in this dataset, with only 49% of arrivals on time. The best was November 2025 at 100%. If your dates are flexible, that 51-point gap is worth planning around.
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Based on 788 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.