Route · STL → IAH · 2020–2025 BTS data
St. Louis to Houston
The STL–IAH corridor (St. Louis, MO → Houston, TX) runs ahead of the national average, served by 14 carriers across roughly 667 miles.
Data updated 2026-06-13
- 82.9%
- On-time
- +3.9 pts
- vs US avg
- 87 min
- Delay when late
- 4,208
- Flights
Cancelled
1.9%
Best Month
Sep 2025 94%
Worst Month
Jul 2024 56%
Distance
667 mi
Carriers
14
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 34 | 9 | 0 | 0 | UA |
| Nov 2025 | 49 | 8 | 1 | 0 | OO,UA |
| Oct 2025 | 50 | 9 | 0 | 0 | UA |
| Sep 2025 | 51 | 3 | 0 | 0 | UA |
| Aug 2025 | 37 | 6 | 1 | 0 | OO,UA |
| Jul 2025 | 31 | 11 | 0 | 0 | OO,UA |
| Jun 2025 | 49 | 17 | 0 | 1 | OO,UA |
| May 2025 | 59 | 15 | 2 | 0 | UA |
| Apr 2025 | 90 | 15 | 0 | 1 | OO,UA |
| Mar 2025 | 34 | 10 | 0 | 0 | OO,UA |
| Feb 2025 | 39 | 13 | 0 | 0 | UA |
| Jan 2025 | 56 | 9 | 5 | 0 | UA |
| Dec 2024 | 58 | 15 | 1 | 0 | UA |
| Nov 2024 | 61 | 11 | 0 | 0 | OO,UA |
| Oct 2024 | 63 | 8 | 0 | 0 | UA |
| Sep 2024 | 60 | 9 | 1 | 0 | UA |
| Aug 2024 | 73 | 21 | 0 | 0 | OO,UA |
| Jul 2024 | 61 | 27 | 4 | 1 | OO,UA |
| Jun 2024 | 84 | 13 | 1 | 1 | OO,UA |
| May 2024 | 43 | 23 | 1 | 1 | OO,UA |
| Apr 2024 | 60 | 12 | 0 | 0 | UA |
| Mar 2024 | 54 | 12 | 0 | 0 | UA |
| Feb 2024 | 56 | 6 | 1 | 0 | UA |
| Jan 2024 | 73 | 12 | 7 | 0 | OO,UA |
Cancellation Rate
1.9%
25 of 1,325 flights
Diversion Rate
0.4%
5 of 1,325 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
Origin airport →IAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
Destination airport →Compare the two airports
See STL and IAH side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–IAH.
Routes with a similar on-time rate
What the Data Says About STL to IAH
Bureau of Transportation Statistics records show St. Louis to Houston (STL to IAH) running a 82.9% on-time rate over 4,208 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 86.7 minutes. The 667-mile corridor is served by 14 carriers, and over the last 24 months 1.9% of 1,325 flights were cancelled, 0.4% diverted.
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 94% on-time, while Jul 2024 came in at just 56% - a 38-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.