Route · ONT → SJC · 2020–2025 BTS data
Ontario to San Jose
The ONT–SJC corridor (Ontario, CA → San Jose, CA) runs ahead of the national average, served by 1 carrier across roughly 333 miles.
Data updated 2026-06-13
- 86.8%
- On-time
- +7.8 pts
- vs US avg
- 57 min
- Delay when late
- 7,951
- Flights
Cancelled
0.2%
Best Month
Oct 2024 97%
Worst Month
Jul 2025 77%
Distance
333 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 118 | 11 | 1 | 0 | WN |
| Nov 2025 | 118 | 19 | 0 | 0 | WN |
| Oct 2025 | 110 | 24 | 0 | 0 | WN |
| Sep 2025 | 107 | 15 | 0 | 0 | WN |
| Aug 2025 | 110 | 13 | 0 | 0 | WN |
| Jul 2025 | 118 | 27 | 0 | 0 | WN |
| Jun 2025 | 115 | 18 | 0 | 0 | WN |
| May 2025 | 123 | 18 | 0 | 0 | WN |
| Apr 2025 | 114 | 11 | 0 | 0 | WN |
| Mar 2025 | 107 | 11 | 0 | 0 | WN |
| Feb 2025 | 99 | 6 | 0 | 0 | WN |
| Jan 2025 | 102 | 9 | 1 | 0 | WN |
| Dec 2024 | 108 | 16 | 0 | 0 | WN |
| Nov 2024 | 109 | 11 | 0 | 0 | WN |
| Oct 2024 | 123 | 4 | 0 | 0 | WN |
| Sep 2024 | 132 | 17 | 1 | 0 | WN |
| Aug 2024 | 134 | 16 | 0 | 0 | WN |
| Jul 2024 | 116 | 16 | 1 | 0 | WN |
| Jun 2024 | 115 | 14 | 0 | 0 | WN |
| May 2024 | 108 | 24 | 0 | 0 | WN |
| Apr 2024 | 104 | 15 | 0 | 0 | WN |
| Mar 2024 | 102 | 12 | 0 | 0 | WN |
| Feb 2024 | 99 | 12 | 1 | 0 | WN |
| Jan 2024 | 110 | 12 | 0 | 0 | WN |
Cancellation Rate
0.2%
5 of 2,701 flights
Diversion Rate
0.0%
0 of 2,701 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 →SJC - San Jose
Full on-time, delay-cause, and seasonal performance for San Jose, CA.
Destination airport →Compare the two airports
See ONT and SJC 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–SJC.
Routes with a similar on-time rate
What the Data Says About ONT to SJC
Ontario to San Jose (ONT to SJC) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.8% on-time rate across 7,951 flights, with delays that do happen averaging 57.4 minutes. The corridor runs roughly 333 miles and is served by 1 carrier. Over the most recent 24 months, 5 of 2,701 flights were cancelled (0.2%) and 0 diverted (0.0%).
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 97% on-time, while Jul 2025 came in at just 77% - a 20-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from ONT to SJC? ▼
What is the cancellation rate for ONT to SJC? ▼
How far is the flight from ONT to SJC? ▼
When is the best time to fly from ONT to SJC? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
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.