69% of SJU → JFK flights arrived on time in June-August 2026 (919 flights). The most reliable was DL 1961, on time 88% of the time on this route. Morning flights did best (79%), evening flights worst (62%). SJU (SJU): no delay reported. New York JFK (JFK): no delay reported.
Best time of day to fly SJU → JFK
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights SJU → JFK, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| DL 1961 Delta | 5:50 PM | 1.1% | |
| B6 904 JetBlue | 7:55 AM | 4.3% | |
| DL 1854 Delta | 7:05 AM | 3.3% | |
| DL 1966 Delta | 1:10 PM | 1.1% | |
| B6 2904 JetBlue | 5:01 AM | 5.4% | |
| B6 304 JetBlue | 6:30 PM | 9.9% | |
| B6 504 JetBlue | 8:10 PM | 8.9% | |
| B6 1004 JetBlue | 3:24 PM | 22.2% | |
| B6 1604 JetBlue | 1:10 PM | 6.5% | |
| B6 1104 JetBlue | 11:50 AM | 0% | |
| B6 704 JetBlue | 10:35 PM | 8.8% |
JFK conditions · JFK → SJU · Cancellations
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From BTS on-time data, June-August 2026; flights with 20+ trips on this route. On-time rates cover each flight number's whole day, which can include other legs. Departure times are local.