San Juan (SJU) to New York (JFK): On-Time Performance
Data through July 2026
The calendar drives reliability on SJU–JFK. October 2024 flights landed on schedule 90% of the time, but July 2026 dropped to 58% — a gap of 32 points. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 72%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 2.0%
- Flights/day
- 9.9
- last 12 months
- Duration
- 4h 6m
- scheduled
- Distance
- 1,598 mi
Best airline from SJU to JFK
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 88% | 11 min | 1.3% | 2,301 |
| JetBlue Airways | 76% | 21 min | 2.5% | 4,763 |
| Frontier Airlines | 74% | 18 min | 1.3% | 1,043 |
Monthly on-time trend
Best time to fly from SJU to JFK
Aim for departures around 7 a.m. (92% on-time); avoid 8 p.m. departures (53%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 22 min |
| Tuesday | 81% | 17 min |
| Wednesdaybest | 82% | 13 min |
| Thursday | 80% | 17 min |
| Friday | 81% | 17 min |
| Saturday | 78% | 18 min |
| Sunday | 77% | 20 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft42%
- Airline operations44%
- National airspace system12%
- Weather2%
Frequently asked questions
- How often are flights from SJU to JFK delayed?
- 21% of SJU–JFK flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from SJU to JFK?
- Delta Air Lines has the best on-time record on this route at 88%, based on 2,301 flights. 3 airlines flew SJU–JFK frequently enough to compare in this period.
- What is the best time of day to fly from SJU to JFK?
- Departures around 7 a.m. have the best record (92% on-time), while departures around 8 p.m. have the worst (53%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to JFK?
- The scheduled SJU–JFK flight time averages 4h 6m over 1,598 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are SJU to JFK flights cancelled?
- 2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from SJU to JFK?
- July 2026 was the roughest month in this dataset, with only 58% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 32-point gap is worth planning around.
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Based on 8,107 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.