IAH to GSP flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Greenville-Spartanburg International Airport · 837 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or GSP right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to Greer (GSP) arrived on time 65% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0% were cancelled, and 25% arrived an hour or more late.
- SkyWest Airlines is the only airline reporting nonstop flights on this route.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (62%).
Which airline is most on time from IAH to GSP?
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 |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 65% | 0.0% | 34 min | 25.0% | 20 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
Not enough departures across different hours to compare.
Best day of the week
On-time arrival rate by day of departure.
- Monday67%0.0% cancelled
- Tuesday50%0.0% cancelled
- Wednesday100%0.0% cancelled
- Thursday67%0.0% cancelled
- Friday75%0.0% cancelled
- Saturday67%0.0% cancelled
- Sunday33%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)62%
- Late-arriving aircraft20%
- Air traffic control & airport congestion18%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
No cancellation causes recorded in this period.
IAH to GSP: common questions
- How often are IAH to GSP flights on time?
- 65% 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 Houston to Greer cancelled?
- 0.0% of scheduled flights were cancelled (0 of 20).
- How long are typical delays?
- Across all flights the average arrival delay was 34 min (early arrivals count as zero). Flights that were late arrived 93 min behind schedule on average, and 25.0% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 21 min taxiing from the gate to takeoff on average.
Related routes
Return trip: GSP to IAH — 100% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → GSP, nonstop flights by US airlines that report to the DOT. How we calculate this.