Route · SEA → IAH · 2020–2025 BTS data
Seattle to Houston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to IAH (Seattle to Houston) ranks #1076 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 82%
- On-time
- +3 pts
- vs US avg
- 62 min
- Delay when late
- 10,723
- Flights
- #1076 of 4927
- Corpus placement
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 |
SEA–IAH seasonal on-time pattern
Best: February (89.9%) · weakest: June (71.6%)
Strongest calendar month
February
89.9% on-time · ~114 flights/mo
Busiest calendar month
July
~185 flights/mo avg
Weakest calendar month
June
71.6% on-time · ~159 flights/mo
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.
SEA on-time profileIAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
IAH on-time profileCompare the two airports
See SEA and IAH side by side on delays, cancellations, and reliability.
Compare SEA vs IAHOrigin-hub reliability standing
Mid-pack among SEA departures
From SEA, this corridor sits with 63 other 75–85% on-time routes out of 89 tracked departures, not the hub's reliability leaders (25 at ≥85%) and not the softest ( 1 below 75%). Destination: Houston · fleet on-time rank #2373 of 4927.
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.
On the multi-year calendar, SEA–IAH peaks in February at 89.9% on-time while July carries the heaviest traffic (~185 flights per month) ; the softest month is June at 71.6%, a 18.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SEA to IAH rank among US routes by traffic? ▼
How often are flights delayed from SEA to IAH? ▼
What is the cancellation rate for SEA to IAH? ▼
How far is the flight from SEA to IAH? ▼
When is the best time to fly from SEA to IAH? ▼
Airports on this route
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.
Using SEA–IAH data
SEA–IAH runs 3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare SEA and IAH airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
- If your dates flex, February (89.9% on-time) beats June (71.6%) on this corridor. Seasonal chart
- 4 other routes post a similar 82% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.