Route · IAH → SEA · 2020–2025 BTS data
Houston to Seattle
The IAH–SEA corridor (Houston, TX → Seattle, WA) runs ahead of the national average, served by 4 carriers across roughly 1,874 miles.
Data updated 2026-06-13
- 79.8%
- On-time
- +0.8 pts
- vs US avg
- 65 min
- Delay when late
- 10,724
- Flights
Cancelled
1.6%
Best Month
Feb 2024 91%
Worst Month
May 2024 61%
Distance
1,874 mi
Carriers
4
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 169 | 49 | 0 | 2 | AS,UA |
| Nov 2025 | 148 | 33 | 0 | 0 | UA,AS |
| Oct 2025 | 175 | 34 | 1 | 0 | AS,UA |
| Sep 2025 | 199 | 28 | 0 | 0 | UA,AS |
| Aug 2025 | 228 | 70 | 3 | 0 | UA,AS |
| Jul 2025 | 236 | 76 | 4 | 1 | AS,UA |
| Jun 2025 | 229 | 82 | 8 | 1 | AS,UA |
| May 2025 | 187 | 51 | 2 | 0 | AS,UA |
| Apr 2025 | 150 | 32 | 2 | 0 | UA,AS |
| Mar 2025 | 150 | 32 | 1 | 0 | AS,UA |
| Feb 2025 | 112 | 32 | 0 | 0 | AS,UA |
| Jan 2025 | 130 | 27 | 5 | 2 | AS,UA |
| Dec 2024 | 155 | 26 | 1 | 1 | AS,UA |
| Nov 2024 | 142 | 19 | 0 | 0 | UA,AS |
| Oct 2024 | 168 | 20 | 0 | 0 | UA,AS |
| Sep 2024 | 204 | 26 | 0 | 2 | UA,AS |
| Aug 2024 | 233 | 54 | 1 | 2 | AS,UA |
| Jul 2024 | 248 | 88 | 12 | 1 | AS,UA |
| Jun 2024 | 214 | 71 | 2 | 0 | AS,UA |
| May 2024 | 214 | 83 | 6 | 0 | AS,UA |
| Apr 2024 | 162 | 41 | 0 | 1 | AS,UA |
| Mar 2024 | 149 | 27 | 1 | 0 | AS,UA |
| Feb 2024 | 116 | 10 | 1 | 1 | AS,UA |
| Jan 2024 | 140 | 35 | 20 | 0 | AS,DL,UA |
Cancellation Rate
1.6%
70 of 4,258 flights
Diversion Rate
0.3%
14 of 4,258 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See IAH and SEA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAH–SEA.
Routes with a similar on-time rate
What the Data Says About IAH to SEA
10,724 tracked flights put the IAH to SEA pairing (Houston to Seattle) at a 79.8% on-time rate, squarely in line with the wider network. Delays that do occur run 64.6 minutes on average. Across the 1,874-mile route and its 4 carriers, the trailing 24 months show 1.6% cancelled and 0.3% diverted (4,258 flights sampled).
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 91% on-time, while May 2024 came in at just 61% - a 30-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.