Route Reliability
Houston → Greenville
IAH–GSP · 837 miles · George Bush Intercontinental Airport to Greenville–Spartanburg International Airport
- 81%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.4%
- Cancelled
- 666
- Flights in the data
Data through May 2026.
United Airlines is the only airline in this data on this route, arriving on time 81% of the time across 666 flights. No comparison to make.
What the data says
Departure time hasn't mattered much.
On-time rates stay between 81% and 82% across the day.
Saturdays have been rough.
IAH–GSP flights arrived on time 88% of the time on Thursdays and just 72% on Saturdays. That gap is worth planning around.
Ticking up lately.
IAH–GSP flights arrived on time 88% of the time over the last three months in the data, compared with 84% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon84%(104 flights)
- Tue81%(85 flights)
- Wed85%(100 flights)
- Thu88%(102 flights)
- Fri81%(101 flights)
- Sat72%(64 flights)
- Sun75%(101 flights)
- 12–3 PM81%(344 flights)
- 6–9 PM82%(313 flights)
Jun 60% → May 87% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 57 |
| July 2025 | 66% | 56 |
| August 2025 | 70% | 54 |
| September 2025 | 92% | 52 |
| October 2025 | 93% | 58 |
| November 2025 | 80% | 56 |
| December 2025 | 78% | 55 |
| January 2026 | 83% | 48 |
| February 2026 | 91% | 45 |
| March 2026 | 89% | 55 |
| April 2026 | 88% | 60 |
| May 2026 | 87% | 61 |
Same trip, other airports
Keep nerding
Based on 666 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.