Newark (EWR) to San Juan (SJU): On-Time Performance
Data through May 2026
The calendar drives reliability on EWR–SJU. September 2024 flights landed on schedule 88% of the time, but November 2025 dropped to 59% — a gap of 28 points. Across the full period the route averages 69% on-time against a national 78%. Morning departures also hold up better than evening ones (73% vs 62%), which matters most in the rough months.
- On-time
- 69%
- arrived <15 min late
- Avg delay
- 26 min
- completed flights
- Cancelled
- 2.1%
- Flights/day
- 5.8
- last 12 months
- Duration
- 3h 58m
- scheduled
- Distance
- 1,608 mi
Best airline from EWR to SJU
4 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 74% | 21 min | 1.9% | 1,284 |
| United Airlines | 70% | 23 min | 1.7% | 2,207 |
| Spirit Airlines | 65% | 26 min | 7.6% | 185 |
| Frontier Airlines | 59% | 42 min | 2.1% | 851 |
Monthly on-time trend
Best time to fly from EWR to SJU
Aim for departures around 2 p.m. (79% on-time); avoid 5 p.m. departures (44%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 70% | 25 min |
| Tuesdaybest | 75% | 21 min |
| Wednesday | 73% | 21 min |
| Thursday | 64% | 28 min |
| Friday | 67% | 30 min |
| Saturday | 67% | 28 min |
| Sunday | 68% | 30 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft31%
- Airline operations42%
- National airspace system24%
- Weather3%
Frequently asked questions
- How often are flights from EWR to SJU delayed?
- 31% of EWR–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 26 minutes.
- Which airline is most reliable from EWR to SJU?
- JetBlue Airways has the best on-time record on this route at 74%, based on 1,284 flights. 4 airlines flew EWR–SJU frequently enough to compare in this period.
- What is the best time of day to fly from EWR to SJU?
- Departures around 2 p.m. have the best record (79% on-time), while departures around 5 p.m. have the worst (44%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from EWR to SJU?
- The scheduled EWR–SJU flight time averages 3h 58m over 1,608 miles. Actual arrival times vary — flights on this route land 15+ minutes late 31% of the time.
- How often are EWR to SJU flights cancelled?
- 2.1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from EWR to SJU?
- November 2025 was the roughest month in this dataset, with only 59% of arrivals on time. The best was September 2024 at 88%. If your dates are flexible, that 28-point gap is worth planning around.
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Based on 4,527 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.