Best Time to Fly JFK to ONT: On-Time Stats by Hour & Airline
John F. Kennedy International → Ontario International
Data through July 2026 · Last updated October 18, 2026
165 flights were scheduled from New York (JFK) to Ontario (ONT) in the last 12 months, and 60.5% of those that flew arrived on time, 17.1 points below the US average of 77.6%.
JetBlue was the only reporting airline with regular flights on this route.
September has been the best month (78% on time) and Saturday the weakest day of the week (56%).
1.8% of flights were cancelled, versus 1.8% nationally.
JFK to ONT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue | 60.5% | 75 min | 1.8% | 165 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly JFK to ONT
On-time arrival % by scheduled departure hour (local time), 345 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5pm–6pm | Limited data | 21 | |
| 6pm–7pm | 58.7% | 2.1% | 188 |
| 7pm–8pm | 69.9% | 2.2% | 136 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on JFK to ONT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Summer peak (Jun 15 - Aug 15) | 50.0% | -22.7 pts | 4.8% | 124 |
| All other days | 72.7% | — | 0.5% | 221 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).