Carrier route record
B6EWR→SJU
JetBlue Airways · Newark to San Juan
- Flights
- 628
- Period
- July 2025 to June 2026
- Share of route
- 30%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on EWR to SJU lands a B−, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 628 flights, with a median arrival 8 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate JetBlue on EWR to SJU from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.4%
Arrivals under 15 minutes late, of 607 completed flights
Avg delay
87 min
Across delayed arrivals only, not all flights
Cancelled
3.34%
National rate is 1.81%
Whole route
70.7%
Every carrier on EWR to SJU, 2,101 flights
These figures cover 628 flights between July 2025 and June 2026. Beyond the headline rate, 12.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
JetBlue against every carrier on EWR to SJU
JetBlue flew 628 of the 2,101 flights on EWR to SJU, about 30% of it. Its 76.4% on time is 6 points better than the route as a whole, which runs 70.7%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from JetBlue at 76.4% to Frontier at 54.4%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways (this page) | 628 | 76.4% | 87 min | 3.34% | B− |
| United Airlines | 1,113 | 71.0% | 75 min | 2.34% | C |
| Spirit Airlinesthin sample | 146 | 67.9% | 72 min | 6.16% | C− |
| Frontier Airlinesthin sample | 214 | 54.4% | 102 min | 2.80% | F |
Departure window
When JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am194 flights80.7%
- 8am–11am152 flights79.6%
- 11am–2pm24 flights—
- 2pm–5pm80 flights72.7%
- 5pm–8pm87 flights63.5%
- 8pm–5am91 flights73.6%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 63.5% on time, against 80.7% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 194 flights scheduled in it.
Across the year
JetBlue on EWR to SJU through the year
January is the weak month at 53.8% on time, against 90.5% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. June was the busiest month here, with 71 flights.
Across the week, Wednesday is the strongest day at 83.5% on time and Monday the weakest at 67.7%. 16 points is a smaller lever than departure hour, but it is free.
Delay causes
Why JetBlue runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 12,000 reported delay minutes.
- 41%Late-arriving aircraft
- 29%Carrier
- 19%National Airspace System
- 10%Extreme weather
- 1%Security
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 12,000 reported delay minutes here, that single category outweighs weather by 4 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 12,385 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 80.7% on time here.
Cancellations run at 3.34%, against 1.81% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
At 1,608 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg runs 75.4% on time across 626 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 628 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking JetBlue on EWR to SJU
Put together: the delay figures matter less here than the 3.34% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 607 completed flights over 12 months sit behind that.
Related
Where to go next
- EWR to SJU, every carrier
- JetBlue on SJU to EWR, the return leg
- United Airlines on EWR to SJU71.0%
- Spirit Airlines on EWR to SJU67.9%
- Frontier Airlines on EWR to SJU54.4%
- JetBlue Airways network-wide record
- Newark Liberty International (EWR) delay statistics
- Luis Munoz Marin International (SJU) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.