GSP to HOU flight delays & on-time performance
Nonstop flights from Greenville-Spartanburg International Airport to William P. Hobby Airport · 845 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at GSP or HOU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Greer (GSP) to Houston (HOU) arrived on time 89% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.7% were cancelled, and 4% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 12pm did best (100% on time); around 8pm did worst (70%).
- Saturday was the most reliable day to fly (100% on time) and Wednesday the least (82%).
- The largest source of delay minutes was late-arriving aircraft (85%).
Which airline is most on time from GSP to HOU?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 89% | 1.7% | 6 min | 3.5% | 173 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 12pm100%20 flights
- 3pm100%29 flights
- 4pm89%39 flights
- 6pm88%42 flights
- 7pm81%16 flights
- 8pm70%20 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday86%0.0% cancelled
- Tuesday96%0.0% cancelled
- Wednesday82%0.0% cancelled
- Thursday85%0.0% cancelled
- Friday93%3.6% cancelled
- Saturday100%0.0% cancelled
- Sunday88%7.1% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft85%
- Air traffic control & airport congestion8%
- Airline (crew, maintenance, cleaning, fueling)7%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion67%
- Extreme weather33%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
GSP to HOU: common questions
- How often are GSP to HOU flights on time?
- 89% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Greer to Houston cancelled?
- 1.7% of scheduled flights were cancelled (3 of 173).
- How long are typical delays?
- Across all flights the average arrival delay was 6 min (early arrivals count as zero). Flights that were late arrived 51 min behind schedule on average, and 3.5% of flights were an hour or more late.
- How long is taxi time at GSP?
- Flights on this route spent 9 min taxiing from the gate to takeoff on average.
Related routes
Return trip: HOU to GSP — 89% on time
More flights from Greer
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: GSP → HOU, nonstop flights by US airlines that report to the DOT. How we calculate this.