Best Time to Fly EWR to SJU: On-Time Stats by Hour & Airline
Newark Liberty International → Luis Munoz Marin International
Data through July 2026 · Last updated October 18, 2026
2,085 flights were scheduled from Newark (EWR) to San Juan (SJU) in the last 12 months, and 70.5% of those that flew arrived on time, 7.1 points below the US average of 77.6%.
Among 4 airlines, JetBlue led with 75.0% on time and Frontier Airlines was last with 56.0%.
Over 24 months, Tuesday was the most reliable day (76% on time) and July the worst month (64%).
The cancellation rate was 3.0% (US average 1.8%).
EWR to SJU on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| JetBlue | 75.0% | 76 min | 4.0% | 656 |
| United Airlines | 70.4% | 78 min | 2.2% | 1,113 |
| Spirit Airlines | 69.3% | 72 min | 4.5% | 133 |
| Frontier Airlines | 56.0% | 103 min | 3.3% | 183 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly EWR to SJU
On-time arrival % by scheduled departure hour (local time), 4,474 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 79.0% | 2.6% | 234 |
| 6am–7am | 73.8% | 1.5% | 326 |
| 7am–8am | 73.8% | 2.6% | 572 |
| 8am–9am | 78.0% | 2.1% | 431 |
| 9am–10am | 75.5% | 0.8% | 742 |
| 10am–11am | 74.8% | 0.0% | 123 |
| 11am–12pm | 60.7% | 4.7% | 340 |
| 12pm–1pm | Limited data | 1 | |
| 1pm–2pm | 58.7% | 1.5% | 201 |
| 2pm–3pm | 79.1% | 0.0% | 43 |
| 3pm–4pm | 73.0% | 2.6% | 38 |
| 4pm–5pm | 71.2% | 3.6% | 83 |
| 5pm–6pm | 42.2% | 4.3% | 47 |
| 6pm–7pm | 80.0% | 0.0% | 85 |
| 7pm–8pm | 64.6% | 1.8% | 817 |
| 8pm–9pm | 68.1% | 5.3% | 76 |
| 9pm–10pm | 73.0% | 6.5% | 108 |
| 10pm–11pm | 54.3% | 1.5% | 204 |
| 11pm–12am | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on EWR to SJU
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 63.6% | -8.1 pts | 4.9% | 81 |
| Christmas & New Year (Dec 20 - Jan 3) | 59.6% | -12.1 pts | 5.3% | 243 |
| Summer peak (Jun 15 - Aug 15) | 67.4% | -4.3 pts | 4.2% | 762 |
| All other days | 71.7% | — | 1.4% | 3,388 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).