Route · SEA → IAH · 2020–2025 BTS data
Seattle to Houston
The SEA–IAH corridor (Seattle, WA → Houston, TX) runs ahead of the national average, served by 4 carriers across roughly 1,874 miles.
Data updated 2026-06-13
- 82%
- On-time
- +3 pts
- vs US avg
- 62 min
- Delay when late
- 10,723
- Flights
Cancelled
1.7%
Best Month
Feb 2024 92%
Worst Month
Jul 2025 65%
Distance
1,874 mi
Carriers
4
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 168 | 42 | 0 | 0 | AS,UA |
| Nov 2025 | 148 | 27 | 0 | 0 | UA,AS |
| Oct 2025 | 176 | 31 | 1 | 0 | AS,UA |
| Sep 2025 | 198 | 21 | 0 | 0 | UA,AS |
| Aug 2025 | 228 | 70 | 3 | 1 | UA,AS |
| Jul 2025 | 236 | 83 | 5 | 3 | AS,UA |
| Jun 2025 | 228 | 79 | 5 | 4 | AS,UA |
| May 2025 | 187 | 47 | 1 | 1 | AS,UA |
| Apr 2025 | 150 | 31 | 0 | 3 | UA,AS |
| Mar 2025 | 150 | 28 | 1 | 0 | AS,UA |
| Feb 2025 | 112 | 17 | 0 | 0 | AS,UA |
| Jan 2025 | 130 | 20 | 5 | 1 | AS,UA |
| Dec 2024 | 155 | 31 | 1 | 1 | AS,UA |
| Nov 2024 | 142 | 26 | 1 | 0 | UA,AS |
| Oct 2024 | 168 | 15 | 0 | 0 | UA,AS |
| Sep 2024 | 204 | 28 | 0 | 0 | UA,AS |
| Aug 2024 | 233 | 57 | 4 | 1 | AS,UA |
| Jul 2024 | 248 | 71 | 15 | 0 | AS,UA |
| Jun 2024 | 213 | 55 | 1 | 0 | AS,UA |
| May 2024 | 214 | 55 | 6 | 1 | AS,UA |
| Apr 2024 | 163 | 34 | 0 | 0 | AS,UA |
| Mar 2024 | 150 | 31 | 1 | 0 | AS,UA |
| Feb 2024 | 116 | 9 | 1 | 0 | AS,UA |
| Jan 2024 | 141 | 28 | 20 | 0 | AS,DL,UA |
Cancellation Rate
1.7%
71 of 4,258 flights
Diversion Rate
0.4%
16 of 4,258 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Origin airport →IAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
Destination airport →Compare the two airports
See SEA 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 SEA–IAH.
Routes with a similar on-time rate
What the Data Says About SEA to IAH
Bureau of Transportation Statistics records show Seattle to Houston (SEA to IAH) running a 82% on-time rate over 10,723 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 62.0 minutes. The 1,874-mile corridor is served by 4 carriers, and over the last 24 months 1.7% of 4,258 flights were cancelled, 0.4% diverted.
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 92% on-time, while Jul 2025 came in at just 65% - a 27-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.