Carrier route record
UASJU→EWR
United Airlines · San Juan to Newark
- Flights
- 1,113
- Period
- July 2025 to June 2026
- Share of route
- 53%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on SJU to EWR 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 1,113 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 United on SJU to EWR from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.5%
Arrivals under 15 minutes late, of 1,081 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
2.70%
National rate is 1.81%
Whole route
74.6%
Every carrier on SJU to EWR, 2,100 flights
These figures cover 1,113 flights between July 2025 and June 2026. Beyond the headline rate, 9.2% 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
United against every carrier on SJU to EWR
United flew 1,113 of the 2,100 flights on SJU to EWR, most of the route. Its 76.5% on time is 2 points better than the route as a whole, which runs 74.6%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from United at 76.5% to Spirit at 63.6%. 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 |
|---|---|---|---|---|---|
| United Airlines (this page) | 1,113 | 76.5% | 90 min | 2.70% | B |
| JetBlue Airways | 626 | 75.4% | 80 min | 2.88% | B |
| Frontier Airlinesthin sample | 215 | 69.9% | 67 min | 2.33% | C |
| Spirit Airlinesthin sample | 146 | 63.6% | 79 min | 8.90% | D− |
Flight by flight
United flight numbers on SJU to EWR
Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 22 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–8am19 flights—
- 8am–11am—
- 11am–2pm240 flights62.9%
- 2pm–5pm140 flights64.9%
- 5pm–8pm349 flights80.6%
- 8pm–5am365 flights85.0%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 62.9% on time against 85.0% for 8pm–5am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 365 flights scheduled in it.
Across the year
United on SJU to EWR through the year
July is the worst month at 54.4% on time, 33 points below May, the best at 87.0%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. December was the busiest month here, with 106 flights.
Across the week, Tuesday is the strongest day at 80.5% on time and Monday the weakest at 71.2%. 9 points is a smaller lever than departure hour, but it is free.
Delay causes
Why United runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 73% of the 23,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 73%Late-arriving aircraft
- 14%Carrier
- 13%National Airspace System
73% 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 23,000 reported delay minutes here, that single category outweighs weather by 73 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 22,726 reported delay minutes.
Cancellations run at 2.70%, against 1.81% nationally. That is about one flight in 40 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. 9.2% 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 is a different operation and performs like one: it runs 71.0% on time across 1,113 flights, 6 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
The sample behind these figures is 1,113 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking United on SJU to EWR
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 87.0% on time and July 54.4%, a swing of 33 points. If the dates move at all, move them out of July before you think about anything else. 1,081 completed flights over 12 months sit behind that.
Related
Where to go next
- SJU to EWR, every carrier
- United on EWR to SJU, the return leg
- JetBlue Airways on SJU to EWR75.4%
- Frontier Airlines on SJU to EWR69.9%
- Spirit Airlines on SJU to EWR63.6%
- United Airlines network-wide record
- Luis Munoz Marin International (SJU) delay statistics
- Newark Liberty International (EWR) 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.