Flight number record
UA 1283
United Airlines · Denver to Newark
- Route
- DEN → EWR
- Departs
- 12:40
- Flights
- 278
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 77.6%. The late ones land close to two hours behind schedule. That rests on 278 flights, with a median arrival 7 minutes early.
The national on-time rate over the same period is 77.6%, so UA 1283 runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.
Key figures
On time
71.1%
Arrivals under 15 minutes late, of 270 completed flights
Avg delay
113 min
Across delayed arrivals only, not all flights
Cancelled
1.80%
National rate is 1.81%
1 hour+ late
14.4%
National rate is 8.1%
These figures cover 278 flights between July 2025 and June 2026. Beyond the headline rate, 14.4% 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 1283 flies
UA 1283 flies DEN to EWR without a single fixed slot. Its most common scheduled departure was 12:40, used on 56 of 278 flights, with 12:34 (34 flights) and 12:45 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 12:4056 flights20.1%
- Departs 12:3434 flights12.2%
- Departs 12:4533 flights11.9%
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 12:40 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1283 runs 8 points worse at 71.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1283 next to DEN to EWR
Every carrier on DEN to EWR combined arrived on time 77.5% of the time across 3,363 flights, so UA 1283 is 6 points behind it. Across its whole network United Airlines managed 79.0%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1283thin sample | 278 | 71.1% | 113 min | 1.80% | C |
| All United Airlines on DEN–EWR | 3,363 | 77.5% | 80 min | 1.58% | B |
| All carriers on DEN–EWR | 3,363 | 77.5% | 80 min | 1.58% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | 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 2025 at 53.7%, a swing of 25 points on roughly 70 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 202543 flights53.7%
- Oct–Dec 202591 flights68.5%
- Jan–Mar 202653 flights76.5%
- Apr–Jun 202691 flights78.7%
Scale runs 45% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1283 did best on Monday at 87.2% on time and worst on Saturday at 62.5%. Each day rests on about 40 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
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 8,775 reported delay minutes.
- 41%Late-arriving aircraft
- 36%National Airspace System
- 23%Carrier
- 1%Extreme weather
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 8,775 reported delay minutes here, that single category outweighs weather by 41 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 8,775 delay minutes reported on UA 1283.
Cancellations sit at 1.80% against a national 1.81%, which is ordinary. Diversions add another 1.08%.
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. 14.4% 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 1,605 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 DFW (49), EWR to FLL (35) and PSC to DEN (24), 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. 278 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, UA 1283 is a flight to put a long connection behind. 14.4% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- DEN to EWR, every carrier and departure
- EWR to DEN, the return direction
- United Airlines 1233 on the same route76.2%
- United Airlines 1715 on the same route64.8%
- United Airlines 2613 on the same route69.3%
- United Airlines 1505 on the same route70.0%
- United Airlines 2345 on the same route95.8%
- United Airlines 1745 on the same route90.2%
- Denver International (DEN) delay statistics
- Newark Liberty International (EWR) 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.