Houston (IAH) to St Louis (STL) flights
Mesa Airlines, GoJet Airlines, SkyWest Airlines, United Airlines fly nonstop from George Bush Intercontinental Airport to St. Louis Lambert International Airport, with about 30 flights a week in July 2026. The 667-mile flight takes about 2h 3m gate to gate.
- Distance
- 667 mi · 1,073 km
- Flight time
- 2h 3m
- Airlines
- 4
- Seats filled
- 76%
Airlines flying IAH to STL
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Mesa Airlines | 17 | Embraer E175 | 47,247 | 2h 1m |
| GoJet Airlines | 7 | Bombardier CRJ550 | 1,205 | 2h 9m |
| SkyWest Airlines | 5 | Embraer E175 | 4,602 | 2h 19m |
| United Airlines | 1 | Airbus A319, Airbus A320-100/200, Boeing 737-700 / MAX 7 | 35,529 | 2h 5m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAH to STL flight schedule
9 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 8:00am and the last at 8:30pm. 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 5559United Airlines · operated by SkyWest Airlines | 8:00am | 10:10am | 14 | 86% |
| UA 6214United Airlines · operated by Mesa Airlines | 8:00am | 10:07am | 13 | 87% |
| UA 5397United Airlines · operated by SkyWest Airlines | 12:00pm | 2:16pm | 7 | 72% |
| UA 4572United Airlines · operated by GoJet Airlines | 12:04pm | 2:13pm | 6 | n/a |
| UA 6175United Airlines · operated by Mesa Airlines | 12:04pm | 2:15pm | 15 | 88% |
| UA 6160United Airlines · operated by Mesa Airlines | 3:31pm | 5:42pm | 12 | 82% |
| UA 4573United Airlines · operated by GoJet Airlines | 6:28pm | 8:40pm | 9 | 63% |
| UA 4565United Airlines · operated by GoJet Airlines | 8:15pm | 10:27pm | 21 | 81% |
| UA 6187United Airlines · operated by Mesa Airlines | 8:30pm | 10:45pm | 10 | 80% |
Is IAH to STL on time?
From September 2025 to August 2026, 83% of 1,260 flights arrived within 15 minutes of schedule and 0.9% were cancelled. Flights leaving around 1pm were the most punctual (92%), those around 6pm the least (70%). Most delay time was caused by late-arriving aircraft (51%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 1,260 | 83% | 12 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 |
|---|---|---|---|
| 7am to 8am | 194 | 86% | |
| 8am to 9am | 151 | 88% | |
| 12pm to 1pm | 104 | 82% | |
| 1pm to 2pm | 169 | 92% | |
| 2pm to 3pm | 69 | 88% | |
| 3pm to 4pm | 66 | 80% | |
| 4pm to 5pm | 58 | 79% | |
| 6pm to 7pm | 77 | 70% | |
| 7pm to 8pm | 104 | 81% | |
| 8pm to 9pm | 250 | 77% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 110 | 7,582 | |
| September 2025 | 113 | 8,241 | |
| October 2025 | 110 | 8,600 | |
| November 2025 | 111 | 7,688 | |
| December 2025 | 91 | 6,826 | |
| January 2026 | 85 | 7,175 | |
| February 2026 | 82 | 6,479 | |
| March 2026 | 94 | 7,311 | |
| April 2026 | 92 | 6,766 | |
| May 2026 | 105 | 6,940 | |
| June 2026 | 127 | 7,710 | |
| July 2026 | 132 | 7,545 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.