Flight number record

UA 1283

United Airlines · Denver to Newark

Route: DEN → EWR
Departs: 12:40
Flights: 324
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1283, check with United Airlines.

UA 1283 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 77.3%. The late ones land close to two hours behind schedule. That rests on 324 flights, with a median arrival 6 minutes early.

The national on-time rate over the same period is 77.3%, so UA 1283 runs 7 points behind the country as a whole. Across a thousand flights that is about 68 extra late arrivals.

On time

70.5%

Arrivals under 15 minutes late, of 308 completed flights

Avg delay

121 min

Across delayed arrivals only, not all flights

Cancelled

2.78%

National rate is 1.89%

1 hour+ late

16.2%

National rate is 8.3%

These figures cover 324 flights between September 2025 and August 2026. Beyond the headline rate, 16.2% 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 1283 flies

UA 1283 flies DEN to EWR without a single fixed slot. Its most common scheduled departure was 12:40, used on 115 of 324 flights, with 12:34 (34 flights) and 12:45 (33 flights) next.

Departs 12:40115 flights35.5%
Departs 12:3434 flights10.5%
Departs 12:4533 flights10.2%

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 12:40 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1283 runs 8 points worse at 70.5%. 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 1283 next to DEN to EWR

Every carrier on DEN to EWR combined arrived on time 78.8% of the time across 3,344 flights, so UA 1283 is 8 points behind it. Across its whole network United Airlines managed 78.8%, which this flight trails by 8 points.

UA 1283 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1283thin sample	324	70.5%	121 min	2.78%	C
All United Airlines on DEN–EWR	3,344	78.8%	83 min	1.53%	B
All carriers on DEN–EWR	3,344	78.8%	83 min	1.53%	B
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 1283 quarter by quarter

UA 1283 did not run the same all year. Its best quarter was Apr–Jun 2026 at 78.7% on time and its weakest Jul–Sep 2026 at 60.8%, a swing of 18 points on roughly 81 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 202530 flights—
Oct–Dec 202591 flights68.5%
Jan–Mar 202653 flights76.5%
Apr–Jun 202691 flights78.7%
Jul–Sep 202659 flights60.8%

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

By weekday, UA 1283 did best on Monday at 80.4% on time and worst on Sunday at 59.1%. Each day rests on about 46 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 1283 runs when it is late

UA 1283 often beats the schedule: 109 of 308 completed flights, 35%, arrived 15 minutes or more early. When UA 1283 is late it tends to be very late: 50 of its 91 late arrivals were an hour or more behind, and 28 were two hours or more.

15+ min early109 flights35.4%
Within 15 min108 flights35.1%
15–29 min late21 flights6.8%
30–59 min late20 flights6.5%
1–2 hours late22 flights7.1%
2+ hours late28 flights9.1%

Scale runs 0% to 100%.

Share of 308 completed flights by arrival against schedule.

14 of 97 late departures made up the time and arrived on time, 14% of them. 8 flights left on time and still arrived late.

The worst days

Worst days for UA 1283

The latest arrival of the period was on 11 October 2025, 9 hours 16 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.

The latest arrivals of UA 1283 in the period
Date	Arrived late by	Largest filed cause
11 October 2025	9 hours 16 minutes	Late-arriving aircraft
17 February 2026	8 hours 49 minutes	Late-arriving aircraft
9 November 2025	8 hours 28 minutes	National Airspace System
19 July 2026	8 hours 6 minutes	Late-arriving aircraft
7 September 2025	7 hours 32 minutes	Late-arriving aircraft

Delay causes

Why UA 1283 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 11,000 reported delay minutes.

Late-arriving aircraft
39%
National Airspace System
39%
Carrier
22%
Extreme weather
1%

39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 11,000 reported delay minutes here, that single category outweighs weather by 39 to one. The split is drawn from 10,962 delay minutes reported on UA 1283.

Cancellations run at 2.78%, against 1.89% nationally. That is roughly 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 routes

What a delay on this flight costs

16.2% 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.

At 1,605 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 same number turns up on five other city pairs in the data, including EWR to FLL (35), PSC to DEN (24) and EWR to LAS (21), but none flew often enough under UA 1283 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to EWR only.

One caution: this is a thin sample. 324 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 1283

For a booking, the cancellation rate is the figure to plan around on UA 1283: 2.78% of its 324 scheduled flights did not operate. A late arrival costs close to two hours, 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