Flight number record
UA 578
United Airlines · Denver to Dallas-Fort Worth
- Route
- DEN → DFW
- Departs
- 13:45
- Flights
- 291
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 578, check with United Airlines.
UA 578 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 291 flights, with a median arrival 3 minutes early.
Key figures
On time
75.4%
Arrivals under 15 minutes late, of 285 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.03%
National rate is 1.89%
1 hour+ late
8.4%
National rate is 8.3%
These figures cover 291 flights between September 2025 and August 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 578 flies
UA 578 flies DEN to DFW without a single fixed slot. Its most common scheduled departure was 13:45, used on 152 of 291 flights, with 13:55 (56 flights) and 13:47 (37 flights) next.
- Departs 13:45152 flights52.2%
- Departs 13:5556 flights19.2%
- Departs 13:4737 flights12.7%
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 13:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 578 runs 3 points worse at 75.4%. 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 578 next to DEN to DFW
Every carrier on DEN to DFW combined arrived on time 75.8% of the time across 6,063 flights, so UA 578 is about level with it. United flew 1,878 flights on the same city pair under all its flight numbers, including this one, and those ran 77.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 578thin sample | 291 | 75.4% | 69 min | 1.03% | B |
| All United Airlines on DEN–DFW | 1,878 | 77.5% | 68 min | 0.59% | B+ |
| All carriers on DEN–DFW | 6,063 | 75.8% | 83 min | 1.80% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 578 quarter by quarter
UA 578 did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.1% on time and its weakest Jul–Sep 2026 at 62.9%, a swing of 21 points on roughly 73 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.
- Oct–Dec 202551 flights84.0%
- Jan–Mar 202690 flights84.1%
- Apr–Jun 202688 flights70.6%
- Jul–Sep 202662 flights62.9%
Scale runs 55% to 90%.
By weekday, UA 578 ranged from 72.5% on Tuesday to 80.5% on Monday. With about 42 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 578 runs when it is late
The 70 late arrivals split 22 under half an hour, 24 between 30 and 60 minutes, and 24 an hour or more.
- 15+ min early47 flights16.5%
- Within 15 min168 flights58.9%
- 15–29 min late22 flights7.7%
- 30–59 min late24 flights8.4%
- 1–2 hours late12 flights4.2%
- 2+ hours late12 flights4.2%
Scale runs 0% to 100%.
Share of 285 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 48 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 27 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 DFW.
The worst days
Worst days for UA 578
The latest arrival of the period was on 26 July 2026, 4 hours 20 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across July, November and January, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 July 2026 | 4 hours 20 minutes | Carrier |
| 20 November 2025 | 3 hours 32 minutes | National Airspace System |
| 25 January 2026 | 3 hours 31 minutes | National Airspace System |
| 29 November 2025 | 3 hours 29 minutes | Late-arriving aircraft |
| 7 July 2026 | 3 hours 11 minutes | Late-arriving aircraft |
Delay causes
Why UA 578 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 4,819 reported delay minutes.
- 37%Late-arriving aircraft
- 35%National Airspace System
- 22%Carrier
- 6%Extreme weather
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,819 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 4,819 delay minutes reported on UA 578.
Cancellations sit at 1.03% against a national 1.89%, which is ordinary. Diversions add another 1.03%.
Connections and routes
What a delay on this flight costs
8.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The 641 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 five other city pairs in the data, including LAX to DEN (63), DTW to SFO (16) and LGA to DEN (15), but none flew often enough under UA 578 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to DFW only.
One caution: this is a thin sample. 291 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 578
For a booking, read UA 578 as 75.4% on time with 1.03% cancelled over 291 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to DFW, every carrier and departure
- DFW to DEN, the return direction
- American Airlines 420 on the same route65.4%
- American Airlines 1523 on the same route83.3%
- United Airlines 1565 on the same route66.9%
- United Airlines 1350 on the same route84.6%
- American Airlines 1832 on the same route61.0%
- American Airlines 852 on the same route84.2%
- Denver International (DEN) delay statistics
- Dallas/Fort Worth International (DFW) 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.