Flight number record
UA 1579
United Airlines · Denver to New York
- Route
- DEN → LGA
- Departs
- 14:10
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1579, check with United Airlines.
UA 1579 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 361 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so UA 1579 runs 9 points behind the country as a whole. Across a thousand flights that is about 90 extra late arrivals.
Key figures
On time
68.3%
Arrivals under 15 minutes late, of 347 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
1.94%
National rate is 1.89%
1 hour+ late
17.0%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. Beyond the headline rate, 17.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1579 flies
UA 1579 flies DEN to LGA without a single fixed slot. Its most common scheduled departure was 14:10, used on 132 of 361 flights, with 14:00 (128 flights) and 13:59 (82 flights) next.
- Departs 14:10132 flights36.6%
- Departs 14:00128 flights35.5%
- Departs 13:5982 flights22.7%
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 14:10 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 1579 runs 4 points worse at 68.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1579 next to DEN to LGA
Every carrier on DEN to LGA combined arrived on time 71.3% of the time across 4,664 flights, so UA 1579 is 3 points behind it. United flew 2,021 flights on the same city pair under all its flight numbers, including this one, and those ran 73.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1579thin sample | 361 | 68.3% | 88 min | 1.94% | C |
| All United Airlines on DEN–LGA | 2,021 | 73.5% | 74 min | 1.78% | C |
| All carriers on DEN–LGA | 4,664 | 71.3% | 70 min | 2.92% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1579 quarter by quarter
UA 1579 did not run the same all year. Its best quarter was Apr–Jun 2026 at 73.6% on time and its weakest Jul–Sep 2026 at 50.0%, a swing of 24 points on roughly 90 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 flights71.6%
- Jan–Mar 202690 flights67.8%
- Apr–Jun 202688 flights73.6%
- Jul–Sep 202662 flights50.0%
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1579 did best on Saturday at 80.4% on time and worst on Monday at 53.8%. Each day rests on about 52 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1579 runs when it is late
UA 1579 often beats the schedule: 87 of 347 completed flights, 25%, arrived 15 minutes or more early. When UA 1579 is late it tends to be very late: 59 of its 110 late arrivals were an hour or more behind, and 32 were two hours or more.
- 15+ min early87 flights25.1%
- Within 15 min150 flights43.2%
- 15–29 min late17 flights4.9%
- 30–59 min late34 flights9.8%
- 1–2 hours late27 flights7.8%
- 2+ hours late32 flights9.2%
Scale runs 0% to 100%.
Share of 347 completed flights by arrival against schedule.
16 of 104 late departures made up the time and arrived on time, 15% of them. In the other direction, 22 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 LGA.
The worst days
Worst days for UA 1579
The latest arrival of the period was on 29 March 2026, 5 hours 26 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 March 2026 | 5 hours 26 minutes | Carrier |
| 9 November 2025 | 4 hours 25 minutes | National Airspace System |
| 7 June 2026 | 4 hours 3 minutes | National Airspace System |
| 6 July 2026 | 4 hours | National Airspace System |
| 7 September 2025 | 3 hours 57 minutes | Late-arriving aircraft |
Delay causes
Why UA 1579 runs late
National Airspace System accounts for 59% of the 9,692 delay minutes carriers reported here, and the remaining four split what is left.
- 59%National Airspace System
- 27%Late-arriving aircraft
- 12%Carrier
- 2%Extreme weather
59% 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 5,702 minutes out of 9,692, against a national NAS share of 21%. The split is drawn from 9,692 delay minutes reported on UA 1579.
Cancellations sit at 1.94% against a national 1.89%, which is ordinary. Diversions add another 1.94%.
Connections and routes
What a delay on this flight costs
17.0% 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 1,620 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 four other city pairs in the data, including LGA to ORD (31), SFO to DEN (30) and MCI to DEN (18), but none flew often enough under UA 1579 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to LGA only.
One caution: this is a thin sample. 361 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 1579
For a booking, UA 1579 is a flight to put a long connection behind. 17.0% 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 LGA, every carrier and departure
- LGA to DEN, the return direction
- Delta Air Lines 751 on the same route81.0%
- United Airlines 2446 on the same route83.4%
- United Airlines 1442 on the same route88.8%
- Delta Air Lines 716 on the same route68.7%
- United Airlines 2168 on the same route66.1%
- United Airlines 598 on the same route68.1%
- Denver International (DEN) delay statistics
- LaGuardia (LGA) 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
- How often a connection fails at the major US hubs
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 ; recomputed monthly. How this data is collected.