San Juan (SJU) to Newark (EWR): On-Time Performance
Data through July 2026
The calendar drives reliability on SJU–EWR. May 2026 flights landed on schedule 86% of the time, but August 2024 dropped to 60% — a gap of 26 points. Across the full period the route averages 73% on-time against a national 78%. Morning departures also hold up better than evening ones (79% vs 70%), which matters most in the rough months.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 24 min
- completed flights
- Cancelled
- 2.4%
- Flights/day
- 5.7
- last 12 months
- Duration
- 4h 13m
- scheduled
- Distance
- 1,608 mi
Best airline from SJU to EWR
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 76% | 25 min | 2.3% | 2,300 |
| JetBlue Airways | 72% | 24 min | 2.2% | 1,382 |
| Frontier Airlines | 66% | 22 min | 1.7% | 848 |
| Spirit Airlines | 65% | 29 min | 8.4% | 155 |
Monthly on-time trend
Best time to fly from SJU to EWR
Aim for departures around 5 a.m. (86% on-time); avoid 5 p.m. departures (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 71% | 28 min |
| Tuesday | 76% | 24 min |
| Wednesdaybest | 78% | 21 min |
| Thursday | 73% | 23 min |
| Friday | 72% | 23 min |
| Saturday | 71% | 25 min |
| Sunday | 69% | 27 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft55%
- Airline operations30%
- National airspace system14%
- Weather1%
Frequently asked questions
- How often are flights from SJU to EWR delayed?
- 27% of SJU–EWR 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 24 minutes.
- Which airline is most reliable from SJU to EWR?
- United Airlines has the best on-time record on this route at 76%, based on 2,300 flights. 4 airlines flew SJU–EWR frequently enough to compare in this period.
- What is the best time of day to fly from SJU to EWR?
- Departures around 5 a.m. have the best record (86% on-time), while departures around 5 p.m. have the worst (62%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to EWR?
- The scheduled SJU–EWR flight time averages 4h 13m over 1,608 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are SJU to EWR flights cancelled?
- 2.4% 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 EWR?
- August 2024 was the roughest month in this dataset, with only 60% of arrivals on time. The best was May 2026 at 86%. If your dates are flexible, that 26-point gap is worth planning around.
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Based on 4,685 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.