Newark (EWR) to San Juan (SJU): On-Time Performance
Data through July 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 70% on-time against a national 78%. Morning departures also hold up better than evening ones (73% vs 63%), which matters most in the rough months.
- On-time
- 70%
- arrived <15 min late
- Avg delay
- 26 min
- completed flights
- Cancelled
- 2.1%
- Flights/day
- 5.7
- last 12 months
- Duration
- 3h 59m
- scheduled
- Distance
- 1,608 mi
Best airline from EWR to SJU
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue Airwaysmost reliable | 74% | 21 min | 2.5% | 1,385 |
| United Airlines | 71% | 23 min | 1.6% | 2,300 |
| Spirit Airlines | 66% | 24 min | 5.8% | 155 |
| Frontier Airlines | 60% | 41 min | 2.1% | 847 |
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 (45%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 70% | 25 min |
| Tuesdaybest | 76% | 21 min |
| Wednesday | 73% | 22 min |
| Thursday | 65% | 27 min |
| Friday | 69% | 29 min |
| Saturday | 66% | 28 min |
| Sunday | 68% | 29 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?
- 30% of EWR–SJU 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 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 1,385 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 (45%). 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 59m over 1,608 miles. Actual arrival times vary — flights on this route land 15+ minutes late 30% of the time.
- How often are EWR to SJU flights cancelled?
- 2.1% 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 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 4,687 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.