Route Reliability
Greenville → Houston
GSP–HOU · 845 miles · Greenville–Spartanburg International Airport to William P. Hobby Airport
- 82%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 1.3%
- Cancelled
- 234
- Flights in the data
Data through May 2026.
Southwest Airlines is the only airline in this data on this route, arriving on time 82% of the time across 234 flights. No comparison to make.
What the data says
The 12–3 PM departure wins.
GSP–HOU flights departing between 12–3 PM arrived on time 100% of the time, versus 71% between 6–9 PM.
Thursdays have been rough.
GSP–HOU flights arrived on time 96% of the time on Saturdays and just 74% on Thursdays. That gap is worth planning around.
Trending in the right direction.
GSP–HOU flights arrived on time 98% of the time over the last three months in the data, compared with 83% in the three months before that.
Flights on this route
The breakdown
- Mon78%(37 flights)
- Tue84%(32 flights)
- Wed77%(31 flights)
- Thu74%(35 flights)
- Fri89%(35 flights)
- Sat96%(26 flights)
- Sun77%(35 flights)
- 12–3 PM100%(27 flights)
- 3–6 PM96%(70 flights)
- 6–9 PM71%(134 flights)
Jun 67% → Feb 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 67% | 30 |
| July 2025 | 52% | 31 |
| August 2025 | 81% | 26 |
| September 2025 | 96% | 26 |
| October 2025 | 71% | 31 |
| November 2025 | 96% | 27 |
| December 2025 | 97% | 31 |
| February 2026 | 100% | 18 |
Same trip, other airports
Keep nerding
Based on 234 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.