Route · IAH → SAN · 2020–2025 BTS data
Houston to San Diego
The IAH–SAN corridor (Houston, TX → San Diego, CA) runs ahead of the national average, served by 5 carriers across roughly 1,303 miles.
Data updated 2026-06-13
- 83.5%
- On-time
- +4.5 pts
- vs US avg
- 68 min
- Delay when late
- 9,422
- Flights
Cancelled
1.8%
Best Month
Nov 2024 89%
Worst Month
Jun 2025 61%
Distance
1,303 mi
Carriers
5
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 145 | 25 | 0 | 1 | UA |
| Nov 2025 | 142 | 29 | 0 | 0 | UA |
| Oct 2025 | 147 | 22 | 0 | 1 | UA |
| Sep 2025 | 137 | 15 | 1 | 0 | UA |
| Aug 2025 | 141 | 35 | 1 | 0 | UA |
| Jul 2025 | 141 | 44 | 3 | 0 | UA |
| Jun 2025 | 141 | 55 | 1 | 0 | UA |
| May 2025 | 145 | 43 | 3 | 0 | UA |
| Apr 2025 | 141 | 24 | 0 | 0 | UA |
| Mar 2025 | 142 | 20 | 0 | 0 | UA |
| Feb 2025 | 122 | 21 | 0 | 0 | UA |
| Jan 2025 | 129 | 16 | 6 | 1 | UA |
| Dec 2024 | 148 | 32 | 2 | 3 | UA |
| Nov 2024 | 148 | 16 | 0 | 0 | UA |
| Oct 2024 | 147 | 32 | 2 | 2 | UA |
| Sep 2024 | 143 | 21 | 0 | 0 | NK,UA |
| Aug 2024 | 181 | 25 | 0 | 0 | NK,UA |
| Jul 2024 | 185 | 67 | 14 | 0 | NK,UA |
| Jun 2024 | 180 | 45 | 1 | 0 | NK,UA |
| May 2024 | 173 | 57 | 4 | 0 | NK,UA |
| Apr 2024 | 141 | 27 | 0 | 0 | UA |
| Mar 2024 | 138 | 23 | 0 | 0 | UA |
| Feb 2024 | 113 | 17 | 0 | 0 | UA |
| Jan 2024 | 131 | 17 | 24 | 1 | UA |
Cancellation Rate
1.8%
62 of 3,501 flights
Diversion Rate
0.3%
9 of 3,501 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 →SAN - San Diego
Full on-time, delay-cause, and seasonal performance for San Diego, CA.
Destination airport →Compare the two airports
See IAH and SAN 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–SAN.
Routes with a similar on-time rate
What the Data Says About IAH to SAN
Bureau of Transportation Statistics records show Houston to San Diego (IAH to SAN) running a 83.5% on-time rate over 9,422 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 68.3 minutes. The 1,303-mile corridor is served by 5 carriers, and over the last 24 months 1.8% of 3,501 flights were cancelled, 0.3% diverted.
The monthly split is wide on this route: Nov 2024 posted the strongest performance at 89% on-time, while Jun 2025 came in at just 61% - 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.