Route · IAH → SFO · 2020–2025 BTS data
Houston to San Francisco
The IAH–SFO corridor (Houston, TX → San Francisco, CA) runs ahead of the national average, served by 2 carriers across roughly 1,635 miles.
Data updated 2026-06-13
- 80.9%
- On-time
- +1.9 pts
- vs US avg
- 70 min
- Delay when late
- 17,301
- Flights
Cancelled
1.2%
Best Month
Sep 2025 89%
Worst Month
May 2024 57%
Distance
1,635 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 311 | 63 | 1 | 0 | UA |
| Nov 2025 | 299 | 55 | 0 | 0 | UA |
| Oct 2025 | 306 | 54 | 2 | 0 | UA |
| Sep 2025 | 289 | 31 | 0 | 0 | UA |
| Aug 2025 | 299 | 58 | 2 | 0 | UA |
| Jul 2025 | 299 | 78 | 0 | 0 | UA |
| Jun 2025 | 295 | 106 | 3 | 0 | UA |
| May 2025 | 303 | 66 | 4 | 0 | UA |
| Apr 2025 | 292 | 39 | 1 | 0 | UA |
| Mar 2025 | 284 | 58 | 0 | 0 | UA |
| Feb 2025 | 229 | 41 | 0 | 1 | UA |
| Jan 2025 | 238 | 42 | 11 | 1 | UA |
| Dec 2024 | 280 | 79 | 4 | 0 | UA |
| Nov 2024 | 268 | 82 | 0 | 0 | UA |
| Oct 2024 | 279 | 45 | 0 | 0 | UA |
| Sep 2024 | 270 | 35 | 0 | 0 | UA |
| Aug 2024 | 280 | 34 | 0 | 0 | UA |
| Jul 2024 | 279 | 91 | 16 | 0 | UA |
| Jun 2024 | 270 | 73 | 2 | 0 | UA |
| May 2024 | 258 | 111 | 2 | 0 | UA |
| Apr 2024 | 240 | 97 | 0 | 1 | UA |
| Mar 2024 | 248 | 87 | 0 | 0 | UA |
| Feb 2024 | 230 | 70 | 1 | 0 | UA |
| Jan 2024 | 251 | 65 | 30 | 0 | UA |
Cancellation Rate
1.2%
79 of 6,597 flights
Diversion Rate
0.0%
3 of 6,597 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 →SFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
Destination airport →Compare the two airports
See IAH and SFO 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–SFO.
Routes with a similar on-time rate
What the Data Says About IAH to SFO
17,301 tracked flights put the IAH to SFO pairing (Houston to San Francisco) at a 80.9% on-time rate, squarely in line with the wider network. Delays that do occur run 69.8 minutes on average. Across the 1,635-mile route and its 2 carriers, the trailing 24 months show 1.2% cancelled and 0.0% diverted (6,597 flights sampled).
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 89% on-time, while May 2024 came in at just 57% - a 32-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from IAH to SFO? ▼
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Flight Guides
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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.