72% of flights from San Juan to Newark arrived on time over the past 12 months. That is worse than the typical U.S. route. The 1 a.m. departures ran on time 82% of the time; the 5 p.m. ones 61%. Most reliable airline: United Airlines (75%). 13% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SJU → EWR: when a flight was late, it was under 45 minutes late 51% of the time. About 1 in 11 flights landed an hour or more late, and 1 in 39 three hours or more; 3.3% were cancelled outright.
- On time or early72%
- 15–30 min late8.5%
- 30–60 min late6.4%
- 1–2 hours late4.7%
- 2–3 hours late2.2%
- 3+ hours late2.6%
- Diverted0.7%
- Cancelled3.3%
Share of all 2,077 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| United Airlines | 1,113 | 75% | 2.8% | −8 min | 9.2% | +104 min | United Airlines |
| JetBlue | 685 | 68% | 3.1% | −1 min | 9.9% | +73 min | JetBlue |
| Frontier Airlines | 153 | 75% | 3.3% | −3 min | 3.9% | +66 min | Frontier Airlines |
| Spirit Airlines | 126 | 57% | 8.7% | +6 min | 16.7% | +80 min | Spirit Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SJU). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | United Airlines | JetBlue |
|---|---|---|
| 1 a.m. | 82% | — |
| 2 a.m. | 82% | — |
| 6 a.m. | — | 79% |
| 1 p.m. | 62% | — |
| 2 p.m. | 63% | — |
| 4 p.m. | — | 68% |
| 6 p.m. | 83% | — |
| 7 p.m. | 78% | — |
Last flight of the day
On SJU → EWR, each airline's last flight of the day was cancelled 2.0% of the time, against 3.4% for its earlier flights, so here the last flight is actually the safer one. It arrived 3+ hours late 1.8% of the time (earlier flights: 3.3%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| JetBlue | 7:45 p.m. | 2.2% | 3.1% | 4.0% | first flight 6:00 a.m. |
| United Airlines | 6:45 p.m. | 1.9% | 1.1% | 3.2% | first flight 1:00 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
By month
Each calendar month pooled over 2023–2026. Best: November (80%). Worst: July (60%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 318 | 65% | 4.7% |
| Tuesday | 286 | 74% | 2.5% |
| Wednesday | 293 | 77% | 1.0% |
| Thursday | 284 | 75% | 1.1% |
| Friday | 307 | 72% | 3.6% |
| Saturday | 301 | 72% | 4.7% |
| Sunday | 288 | 66% | 5.2% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 31 · airline 22 · air traffic/airport 15
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| UA 2219 | 1:00 a.m. | 365 | 82% | 1.4% | −17 min | United Airlines |
| UA 1173 | 1:25 p.m. | 365 | 61% | 4.9% | +2 min | United Airlines |
| UA 2036 | 6:45 p.m. | 364 | 81% | 1.9% | −9 min | United Airlines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Jan 3, 2026 | 8 | 0% | 7 |
| Feb 23, 2026 | 7 | 0% | 7 |
| Jan 26, 2026 | 6 | 0% | 3 |
| Jul 28, 2026 | 6 | 0% | 1 |
| Jan 25, 2026 | 6 | 0% | 6 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of San Juan or Newark. None has been clearly more reliable than SJU → EWR.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| SJU → EWR (this route) | 2,077 | 72% | 3.3% |
| SJU → JFK San Juan to New York JFK | 3,560 | 75% | 3.9% |
Questions
How often are flights from SJU to EWR on time?
72% of 2,077 scheduled flights from San Juan, PR to Newark, NJ arrived within 15 minutes of schedule between September 2025 and August 2026. 3.3% were cancelled.
What is the best time of day to fly SJU to EWR?
Flights scheduled to leave at 1 a.m. were the most reliable (82% on time). The 5 p.m. departures were the least (61%).
Which airline is most on time from SJU to EWR?
United Airlines: 75% of its 1,113 flights on the route arrived on time. JetBlue: 68%. Frontier Airlines: 75%. Spirit Airlines: 57%.
What month has the most delays from SJU to EWR?
July (60% on time). The best month is November (80%), over 2023–2026.
Is the last flight of the day from SJU to EWR more likely to be cancelled?
No, the opposite. Each airline's last SJU–EWR flight of the day was cancelled 2.0% of the time over the past year, against 3.4% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- EWR → SJU (return)
- San Juan (SJU) delays by hour
- Flights into Newark (EWR)
- United Airlines on-time record
- JetBlue on-time record
- Frontier Airlines on-time record
- Spirit Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.