Flight number record
UA 1511
United Airlines · Newark to Miami
- Route
- EWR → MIA
- Departs
- 14:00
- Flights
- 313
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1511, check with United Airlines.
UA 1511 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 313 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.6%, so UA 1511 runs 7 points behind the country as a whole. Across a thousand flights that is about 74 extra late arrivals.
Key figures
On time
70.2%
Arrivals under 15 minutes late, of 302 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
3.19%
National rate is 1.81%
1 hour+ late
9.6%
National rate is 8.1%
These figures cover 313 flights between July 2025 and June 2026. Beyond the headline rate, 9.6% 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.
Schedule
When UA 1511 flies
UA 1511 flies EWR to MIA without a single fixed slot. Its most common scheduled departure was 14:00, used on 68 of 313 flights, with 13:00 (39 flights) and 13:10 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 14:0068 flights21.7%
- Departs 13:0039 flights12.5%
- Departs 13:1037 flights11.8%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 14:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 1511 runs 2 points worse at 70.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1511 next to EWR to MIA
Every carrier on EWR to MIA combined arrived on time 77.4% of the time across 3,985 flights, so UA 1511 is 7 points behind it. United flew 2,251 flights on the same city pair under all its flight numbers, including this one, and those ran 77.6% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1511thin sample | 313 | 70.2% | 64 min | 3.19% | C− |
| All United Airlines on EWR–MIA | 2,251 | 77.6% | 72 min | 2.18% | B |
| All carriers on EWR–MIA | 3,985 | 77.4% | 76 min | 2.63% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1511 quarter by quarter
UA 1511 did not run the same all year. Its best quarter was Apr–Jun 2026 at 79.5% on time and its weakest Jan–Mar 2026 at 59.0%, a swing of 21 points on roughly 78 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202586 flights71.4%
- Oct–Dec 202553 flights70.2%
- Jan–Mar 202685 flights59.0%
- Apr–Jun 202689 flights79.5%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1511 did best on Tuesday at 84.4% on time and worst on Sunday at 59.5%. Each day rests on about 45 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1511 runs late
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 5,781 reported delay minutes.
- 37%National Airspace System
- 33%Late-arriving aircraft
- 22%Carrier
- 8%Extreme weather
- 1%Security
37% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,114 minutes out of 5,781, against a national NAS share of 21%. The split is drawn from 5,781 delay minutes reported on UA 1511.
Cancellations run at 3.19%, 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 routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.6% 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.
The 1,085 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on nine other city pairs in the data, including MIA to DEN (51), MIA to SFO (46) and TPA to EWR (32), but none flew often enough under UA 1511 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to MIA only.
One caution: this is a thin sample. 313 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 UA 1511
For a booking, the cancellation rate is the figure to plan around on UA 1511: 3.19% of its 313 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- EWR to MIA, every carrier and departure
- MIA to EWR, the return direction
- American Airlines 1196 on the same route94.5%
- United Airlines 2295 on the same route80.2%
- Newark Liberty International (EWR) delay statistics
- Miami International (MIA) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.