Flight number record

UA 1511

United Airlines · Newark to Miami

Route: EWR → MIA
Departs: 13:00
Flights: 307
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 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, 8 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 307 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.3%, so UA 1511 runs 8 points behind the country as a whole. Across a thousand flights that is about 80 extra late arrivals.

On time

69.3%

Arrivals under 15 minutes late, of 296 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

2.93%

National rate is 1.89%

1 hour+ late

10.8%

National rate is 8.3%

These figures cover 307 flights between September 2025 and August 2026. Beyond the headline rate, 10.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When UA 1511 flies

UA 1511 flies EWR to MIA without a single fixed slot. Its most common scheduled departure was 13:00, used on 74 of 307 flights, with 14:00 (67 flights) and 13:10 (37 flights) next.

Departs 13:0074 flights24.1%
Departs 14:0067 flights21.8%
Departs 13:1037 flights12.1%

Scale runs 0% to 100%.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 13:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1511 runs 9 points worse at 69.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

UA 1511 next to EWR to MIA

Every carrier on EWR to MIA combined arrived on time 77.5% of the time across 3,914 flights, so UA 1511 is 8 points behind it. United flew 2,238 flights on the same city pair under all its flight numbers, including this one, and those ran 77.1% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 10 points.

UA 1511 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1511thin sample	307	69.3%	71 min	2.93%	C
All United Airlines on EWR–MIA	2,238	77.1%	72 min	2.50%	B
All carriers on EWR–MIA	3,914	77.5%	82 min	2.96%	B
United Airlines, whole network	830,825	78.8%	73 min	1.02%	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 77 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 202524 flights—
Oct–Dec 202553 flights70.2%
Jan–Mar 202685 flights59.0%
Apr–Jun 202689 flights79.5%
Jul–Sep 202656 flights64.8%

Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1511 did best on Tuesday at 83.7% on time and worst on Thursday at 59.1%. Each day rests on about 44 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 1511 runs when it is late

UA 1511 often beats the schedule: 85 of 296 completed flights, 29%, arrived 15 minutes or more early. The 91 late arrivals split 31 under half an hour, 28 between 30 and 60 minutes, and 32 an hour or more.

15+ min early85 flights28.7%
Within 15 min120 flights40.5%
15–29 min late31 flights10.5%
30–59 min late28 flights9.5%
1–2 hours late17 flights5.7%
2+ hours late15 flights5.1%

Scale runs 0% to 100%.

Share of 296 completed flights by arrival against schedule.

13 of 64 late departures made up the time and arrived on time, 20% of them. In the other direction, 40 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MIA.

The worst days

Worst days for UA 1511

The latest arrival of the period was on 30 October 2025, 6 hours 29 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.

The latest arrivals of UA 1511 in the period
Date	Arrived late by	Largest filed cause
30 October 2025	6 hours 29 minutes	Late-arriving aircraft
27 August 2026	6 hours 7 minutes	Extreme weather
16 March 2026	5 hours 48 minutes	Extreme weather
20 February 2026	4 hours 28 minutes	Late-arriving aircraft
6 July 2026	4 hours 8 minutes	Late-arriving aircraft

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 6,448 reported delay minutes.

National Airspace System
37%
Late-arriving aircraft
31%
Carrier
19%
Extreme weather
11%
Security
1%

Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 6,448 delay minutes reported on UA 1511.

Cancellations run at 2.93%, against 1.89% nationally. That is roughly 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

10.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.

The same number turns up on eight other city pairs in the data, including MIA to SFO (46), TPA to EWR (32) and DEN to HDN (31), 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. 307 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: 2.93% of its 307 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.

Where to go next

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures