Route · ONT → SFO · 2020–2025 BTS data
Ontario to San Francisco
The ONT–SFO corridor (Ontario, CA → San Francisco, CA) runs ahead of the national average, served by 12 carriers across roughly 363 miles.
Data updated 2026-06-13
- 81.5%
- On-time
- +2.5 pts
- vs US avg
- 75 min
- Delay when late
- 8,435
- Flights
Cancelled
1.2%
Best Month
Jan 2025 91%
Worst Month
May 2024 48%
Distance
363 mi
Carriers
12
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 104 | 25 | 2 | 0 | F9,UA,OO |
| Nov 2025 | 105 | 25 | 2 | 0 | UA,F9 |
| Oct 2025 | 114 | 48 | 0 | 0 | OO,UA,F9 |
| Sep 2025 | 108 | 38 | 0 | 0 | UA,OO,F9 |
| Aug 2025 | 109 | 31 | 1 | 0 | OO,F9,UA |
| Jul 2025 | 104 | 26 | 0 | 0 | OO,UA,F9 |
| Jun 2025 | 104 | 17 | 1 | 0 | OO,UA,F9 |
| May 2025 | 131 | 22 | 0 | 0 | OO,UA,F9 |
| Apr 2025 | 154 | 20 | 1 | 0 | F9,OO,UA |
| Mar 2025 | 117 | 34 | 3 | 1 | OO,UA,F9 |
| Feb 2025 | 105 | 16 | 4 | 0 | OO,UA,F9 |
| Jan 2025 | 101 | 9 | 1 | 0 | OO,UA,F9 |
| Dec 2024 | 140 | 37 | 2 | 0 | F9,OO,UA |
| Nov 2024 | 180 | 47 | 5 | 1 | OO,UA,F9 |
| Oct 2024 | 165 | 32 | 1 | 0 | UA,OO,F9 |
| Sep 2024 | 149 | 29 | 0 | 0 | OO,UA,F9 |
| Aug 2024 | 140 | 32 | 2 | 0 | F9,OO,UA |
| Jul 2024 | 127 | 23 | 3 | 0 | F9,OO,UA |
| Jun 2024 | 86 | 31 | 2 | 0 | F9,OO,UA |
| May 2024 | 92 | 48 | 0 | 0 | F9,OO,UA |
| Apr 2024 | 90 | 40 | 0 | 0 | F9,OO,UA |
| Mar 2024 | 120 | 54 | 0 | 0 | F9,OO,UA |
| Feb 2024 | 98 | 37 | 5 | 0 | F9,OO |
| Jan 2024 | 98 | 26 | 0 | 0 | F9,OO |
Cancellation Rate
1.2%
35 of 2,841 flights
Diversion Rate
0.1%
2 of 2,841 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
Origin airport →SFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
Destination airport →Compare the two airports
See ONT 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 ONT–SFO.
Routes with a similar on-time rate
What the Data Says About ONT to SFO
8,435 tracked flights put the ONT to SFO pairing (Ontario to San Francisco) at a 81.5% on-time rate, squarely in line with the wider network. Delays that do occur run 75.4 minutes on average. Across the 363-mile route and its 12 carriers, the trailing 24 months show 1.2% cancelled and 0.1% diverted (2,841 flights sampled).
The monthly split is wide on this route: Jan 2025 posted the strongest performance at 91% on-time, while May 2024 came in at just 48% - a 43-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.