Route Reliability
Ontario → San Jose
ONT–SJC · 333 miles · Ontario International Airport to San José Mineta International Airport
- 86%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 0.1%
- Cancelled
- 1,319
- Flights in the data
Data through May 2026.
Southwest Airlines is the only airline in this data on this route, arriving on time 86% of the time across 1,319 flights. No comparison to make.
What the data says
Morning flights do better here.
ONT–SJC flights departing between 3–6 AM arrived on time 100% of the time, versus 72% between 6–9 PM.
Sunday scaries are real for this one.
ONT–SJC flights arrived on time 90% of the time on Wednesdays. On Sundays: 80%.
It basically never cancels.
Out of 1,319 scheduled flights, only 0.1% were cancelled.
Slipping a little lately.
ONT–SJC flights arrived on time 87% of the time over the last three months in the data, compared with 92% in the three months before that.
Flights on this route
The breakdown
- Mon85%(207 flights)
- Tue90%(174 flights)
- Wed90%(172 flights)
- Thu87%(202 flights)
- Fri86%(202 flights)
- Sat90%(156 flights)
- Sun80%(205 flights)
- 3–6 AM100%(24 flights)
- 6–9 AM98%(309 flights)
- 9 AM–12 PM96%(232 flights)
- 12–3 PM90%(160 flights)
- 3–6 PM79%(291 flights)
- 6–9 PM72%(294 flights)
- 9 PM–12 AM—(8 flights)
Jun 84% → May 92% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 84% | 115 |
| July 2025 | 77% | 118 |
| August 2025 | 88% | 110 |
| September 2025 | 86% | 107 |
| October 2025 | 79% | 110 |
| November 2025 | 86% | 118 |
| December 2025 | 91% | 117 |
| January 2026 | 94% | 101 |
| February 2026 | 91% | 99 |
| March 2026 | 83% | 107 |
| April 2026 | 86% | 106 |
| May 2026 | 92% | 110 |
Same trip, other airports
Keep nerding
Based on 1,319 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.