Route · IAD → IAH · 2020–2025 BTS data
Washington to Houston
The IAD–IAH corridor (Washington, DC → Houston, TX) runs ahead of the national average, served by 3 carriers across roughly 1,190 miles.
Data updated 2026-06-13
- 82%
- On-time
- +3 pts
- vs US avg
- 70 min
- Delay when late
- 10,000
- Flights
Cancelled
0.9%
Best Month
Sep 2025 92%
Worst Month
Jul 2024 65%
Distance
1,190 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 139 | 31 | 0 | 0 | UA |
| Nov 2025 | 148 | 20 | 0 | 0 | UA |
| Oct 2025 | 180 | 32 | 0 | 0 | UA |
| Sep 2025 | 195 | 15 | 0 | 0 | UA |
| Aug 2025 | 174 | 36 | 0 | 0 | UA |
| Jul 2025 | 155 | 43 | 1 | 0 | UA |
| Jun 2025 | 176 | 54 | 3 | 0 | UA |
| May 2025 | 186 | 56 | 1 | 1 | UA |
| Apr 2025 | 180 | 33 | 0 | 1 | UA |
| Mar 2025 | 153 | 17 | 0 | 0 | UA |
| Feb 2025 | 114 | 21 | 0 | 0 | UA |
| Jan 2025 | 130 | 32 | 6 | 1 | UA |
| Dec 2024 | 138 | 35 | 1 | 0 | UA |
| Nov 2024 | 148 | 12 | 0 | 0 | UA |
| Oct 2024 | 155 | 16 | 0 | 2 | UA |
| Sep 2024 | 150 | 21 | 1 | 0 | UA |
| Aug 2024 | 155 | 27 | 3 | 0 | UA |
| Jul 2024 | 155 | 55 | 8 | 0 | UA |
| Jun 2024 | 150 | 36 | 2 | 0 | UA |
| May 2024 | 156 | 48 | 0 | 2 | UA |
| Apr 2024 | 120 | 26 | 0 | 1 | UA |
| Mar 2024 | 124 | 16 | 0 | 1 | UA |
| Feb 2024 | 117 | 12 | 1 | 0 | UA |
| Jan 2024 | 121 | 30 | 6 | 0 | UA |
Cancellation Rate
0.9%
33 of 3,619 flights
Diversion Rate
0.2%
9 of 3,619 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →IAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
Destination airport →Compare the two airports
See IAD 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 IAD–IAH.
Routes with a similar on-time rate
What the Data Says About IAD to IAH
Bureau of Transportation Statistics records show Washington to Houston (IAD to IAH) running a 82% on-time rate over 10,000 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 69.9 minutes. The 1,190-mile corridor is served by 3 carriers, and over the last 24 months 0.9% of 3,619 flights were cancelled, 0.2% diverted.
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 92% on-time, while Jul 2024 came in at just 65% - a 28-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.