Greenville/Greer/Spartanburg (GSP) to Houston (IAH) flights
Mesa Airlines flies nonstop from Greenville-Spartanburg International Airport to George Bush Intercontinental Airport, with about 14 flights a week in July 2026. The 837-mile flight takes about 2h 35m gate to gate.
- Distance
- 837 mi · 1,347 km
- Flight time
- 2h 35m
- Airlines
- 1
- Seats filled
- 86%
Airlines flying GSP to IAH
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Mesa Airlines | 14 | Embraer E175 | 40,658 | 2h 35m |
| SkyWest AirlinesSeasonal or ended | n/a | Embraer E175 | 1,326 | 2h 36m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
GSP to IAH flight schedule
5 flight numbers flew this route in August 2026. The first usually leaves at 7:00am and the last at 5:31pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 4049United Airlines · operated by Mesa Airlines | 7:00am | 8:33am | 10 | 88% |
| UA 5325United Airlines · operated by SkyWest Airlines | 7:00am | 8:44am | 10 | 100% |
| UA 6174United Airlines · operated by Mesa Airlines | 7:00am | 8:44am | 11 | 100% |
| UA 4038United Airlines · operated by Mesa Airlines | 5:10pm | 6:45pm | 10 | 79% |
| UA 4059United Airlines · operated by Mesa Airlines | 5:31pm | 7:10pm | 15 | 93% |
Is GSP to IAH on time?
From September 2025 to August 2026, 88% of 673 flights arrived within 15 minutes of schedule and 1.2% were cancelled. Flights leaving around 7am were the most punctual (91%), those around 5pm the least (85%). Most delay time was caused by air traffic control and airport congestion (42%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 673 | 88% | 12 min | 1.2% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 6am to 7am | 153 | 91% | |
| 7am to 8am | 211 | 91% | |
| 4pm to 5pm | 139 | 85% | |
| 5pm to 6pm | 170 | 85% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 54 | 3,369 | |
| September 2025 | 52 | 3,419 | |
| October 2025 | 58 | 3,949 | |
| November 2025 | 56 | 3,386 | |
| December 2025 | 56 | 3,697 | |
| January 2026 | 48 | 2,902 | |
| February 2026 | 44 | 2,705 | |
| March 2026 | 56 | 3,291 | |
| April 2026 | 60 | 3,582 | |
| May 2026 | 60 | 3,822 | |
| June 2026 | 60 | 3,988 | |
| July 2026 | 61 | 4,055 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.