Houston (IAH) to Greenville/Greer/Spartanburg (GSP) flights
Mesa Airlines flies nonstop from George Bush Intercontinental Airport to Greenville-Spartanburg International Airport, with about 14 flights a week in July 2026. The 837-mile flight takes about 2h 16m gate to gate.
- Distance
- 837 mi · 1,347 km
- Flight time
- 2h 16m
- Airlines
- 1
- Seats filled
- 84%
Airlines flying IAH to GSP
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Mesa Airlines | 14 | Embraer E175 | 39,803 | 2h 16m |
| SkyWest AirlinesSeasonal or ended | n/a | Embraer E175 | 1,316 | 2h 20m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAH to GSP flight schedule
5 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 12:30pm and the last at 7:50pm. 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 6139United Airlines · operated by Mesa Airlines | 12:30pm | 3:59pm | 10 | 73% |
| UA 6126United Airlines · operated by Mesa Airlines | 1:30pm | 4:50pm | 21 | 95% |
| UA 5340United Airlines · operated by SkyWest Airlines | 6:35pm | 9:58pm | 11 | 80% |
| UA 6206United Airlines · operated by Mesa Airlines | 6:35pm | 9:58pm | 4 | n/a |
| UA 4033United Airlines · operated by Mesa Airlines | 7:50pm | 11:19pm | 10 | 83% |
Is IAH to GSP on time?
From September 2025 to August 2026, 84% of 673 flights arrived within 15 minutes of schedule and 0.9% were cancelled. Flights leaving around 1pm were the most punctual (94%), those around 12pm the least (82%). Most delay time was caused by late-arriving aircraft (43%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 673 | 84% | 14 min | 0.9% |
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 |
|---|---|---|---|
| 12pm to 1pm | 317 | 82% | |
| 1pm to 2pm | 35 | 94% | |
| 6pm to 7pm | 247 | 85% | |
| 7pm to 8pm | 72 | 88% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 54 | 3,349 | |
| September 2025 | 52 | 3,127 | |
| October 2025 | 59 | 3,859 | |
| November 2025 | 56 | 3,344 | |
| December 2025 | 55 | 3,355 | |
| January 2026 | 48 | 2,951 | |
| February 2026 | 45 | 2,839 | |
| March 2026 | 55 | 3,209 | |
| April 2026 | 60 | 3,518 | |
| May 2026 | 61 | 3,677 | |
| June 2026 | 60 | 3,949 | |
| July 2026 | 61 | 3,942 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.