Best Time to Fly ONT to JFK: On-Time Stats by Hour & Airline
Ontario International → John F. Kennedy International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 70.4% of Ontario (ONT) to New York (JFK) flights arrived on time (165 scheduled flights). That is 7.3 points below the national average of 77.6%.
JetBlue was the only reporting airline with regular flights on this route.
Over 24 months, Wednesday was the most reliable day (81% on time) and July the worst month (53%).
The cancellation rate was 1.8% (US average 1.8%).
ONT to JFK 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 | 70.4% | 197 min | 1.8% | 165 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ONT to JFK
On-time arrival % by scheduled departure hour (local time), 345 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 10pm–11pm | 82.9% | 0.0% | 117 |
| 11pm–12am | 71.2% | 3.5% | 228 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ONT to JFK
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) | 60.7% | -22.4 pts | 4.8% | 124 |
| All other days | 83.1% | — | 0.9% | 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).