Route · ONT → SJC · 2020–2025 BTS data
Ontario to San Jose
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ONT to SJC (Ontario to San Jose) ranks #1549 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 86.8%
- On-time
- +7.8 pts
- vs US avg
- 57 min
- Delay when late
- 7,951
- Flights
- #1549 of 4927
- Corpus placement
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 |
ONT–SJC seasonal on-time pattern
Best: February (91.8%) · weakest: May (83.1%)
Strongest calendar month
February
91.8% on-time · ~101 flights/mo
Busiest calendar month
August
~119 flights/mo avg
Weakest calendar month
May
83.1% on-time · ~103 flights/mo
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.
ONT on-time profileSJC - San Jose
Full on-time, delay-cause, and seasonal performance for San Jose, CA.
SJC on-time profileCompare the two airports
See ONT and SJC side by side on delays, cancellations, and reliability.
Compare ONT vs SJCOrigin-hub reliability standing
Among ONT's stronger departures
ONT → SJC posts a 86.8% on-time rate, landing in the ≥85% band with 10 of 21 BTS-tracked routes leaving Ontario. The same hub also shows 9 mid-band and 2 challenged departures · fleet-wide on-time rank #682 of 4927 (highest on-time = #1).
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.
On the multi-year calendar, ONT–SJC peaks in February at 91.8% on-time while August carries the heaviest traffic (~119 flights per month) ; the softest month is May at 83.1%, a 8.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does ONT to SJC rank among US routes by traffic? ▼
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? ▼
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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 ONT–SJC data
ONT–SJC runs 7.8 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare ONT and SJC airport profiles: delay causes and top routes differ even on the same corridor. ONT airport
- If your dates flex, February (91.8% on-time) beats May (83.1%) on this corridor. Seasonal chart
- 4 other routes post a similar 86.8% 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.