Route
STL → IAH
St. Louis Lambert International Airport George Bush Intercontinental Airport
667 miles
Return route IAH → STL →
How punctual is this route?
- On-time arrivals
- 80.1%
- Less than 15 minutes late
- Cancelled
- 1.0%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 411
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 48%
- Late-arriving aircraft 31%
- Air traffic control & airport 15%
- Extreme weather 6%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 94.1% | 51 |
| October 2025 | 82.0% | 50 |
| November 2025 | 83.3% | 49 |
| December 2025 | 73.5% | 34 |
| January 2026 | 72.7% | 35 |
| February 2026 | 86.2% | 29 |
| March 2026 | 83.3% | 31 |
| April 2026 | 90.0% | 30 |
| May 2026 | 67.7% | 31 |
| June 2026 | 75.0% | 20 |
| July 2026 | 61.5% | 26 |
| August 2026 | 76.0% | 25 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 334 | 83.9% | 1.2% | 60 min |
| SkyWest Airlines | 77 | 63.6% | 0.0% | 70 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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