New York (JFK) to San Juan (SJU): On-Time Performance
Data through May 2026
The calendar drives reliability on JFK–SJU. September 2024 flights landed on schedule 86% of the time, but October 2025 dropped to 63% — a gap of 24 points. Across the full period the route averages 72% on-time against a national 78%. Morning departures also hold up better than evening ones (76% vs 64%), which matters most in the rough months.
- On-time
- 72%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 1.6%
- Flights/day
- 10
- last 12 months
- Duration
- 3h 59m
- scheduled
- Distance
- 1,598 mi
Best airline from JFK to SJU
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 79% | 14 min | 1.1% | 2,208 |
| JetBlue Airways | 71% | 22 min | 1.9% | 4,533 |
| Frontier Airlines | 64% | 32 min | 1.9% | 1,090 |
Monthly on-time trend
Best time to fly from JFK to SJU
Aim for departures around 8 a.m. (84% on-time); avoid 6 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 21 min |
| Tuesdaybest | 75% | 17 min |
| Wednesday | 75% | 19 min |
| Thursday | 69% | 22 min |
| Friday | 75% | 19 min |
| Saturday | 71% | 22 min |
| Sunday | 69% | 25 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft30%
- Airline operations43%
- National airspace system25%
- Weather2%
Frequently asked questions
- How often are flights from JFK to SJU delayed?
- 28% of JFK–SJU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 21 minutes.
- Which airline is most reliable from JFK to SJU?
- Delta Air Lines has the best on-time record on this route at 79%, based on 2,208 flights. 3 airlines flew JFK–SJU frequently enough to compare in this period.
- What is the best time of day to fly from JFK to SJU?
- Departures around 8 a.m. have the best record (84% on-time), while departures around 6 p.m. have the worst (60%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from JFK to SJU?
- The scheduled JFK–SJU flight time averages 3h 59m over 1,598 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are JFK to SJU flights cancelled?
- 1.6% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from JFK to SJU?
- October 2025 was the roughest month in this dataset, with only 63% of arrivals on time. The best was September 2024 at 86%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 7,831 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.