Best Time to Fly HOU to GSP: On-Time Stats by Hour & Airline
William P Hobby → Greenville-Spartanburg International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 88.9% of Houston (HOU) to Greer (GSP) flights arrived on time (173 scheduled flights). That is 11.3 points above the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (92% on time) and July the worst month (61%).
The cancellation rate was 1.2% (US average 1.8%).
HOU to GSP 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 |
|---|---|---|---|---|
| Southwest Airlines | 88.9% | 33 min | 1.2% | 173 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly HOU to GSP
On-time arrival % by scheduled departure hour (local time), 329 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 10am–11am | 91.8% | 0.0% | 97 |
| 11am–12pm | 90.0% | 0.0% | 100 |
| 12pm–1pm | 82.0% | 2.5% | 40 |
| 1pm–2pm | 60.8% | 0.0% | 51 |
| 2pm–3pm | Limited data | 5 | |
| 3pm–4pm | 67.7% | 2.9% | 35 |
| 4pm–5pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on HOU to GSP
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 | 8 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 17 | ||
| Summer peak (Jun 15 - Aug 15) | 67.7% | -19.7 pts | 0.0% | 65 |
| All other days | 87.3% | — | 0.8% | 239 |
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).