Flight number record
UA 1479
United Airlines · Denver to Louisville
- Route
- DEN → SDF
- Departs
- 09:45
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1479, check with United Airlines.
UA 1479 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 40 minutes. That rests on 365 flights, with a median arrival 9 minutes early.
Set against the rest of the country, UA 1479's record is 13 points better than the US average of 77.3%. That gap is worth roughly 131 fewer late arrivals for every thousand flights.
Key figures
On time
90.4%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
42 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
1.7%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When UA 1479 flies
UA 1479 flies DEN to SDF without a single fixed slot. Its most common scheduled departure was 09:45, used on 146 of 365 flights, with 09:40 (82 flights) and 09:49 (49 flights) next.
- Departs 09:45146 flights40.0%
- Departs 09:4082 flights22.5%
- Departs 09:4949 flights13.4%
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 09:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1479 runs 7 points better at 90.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1479 next to DEN to SDF
Every carrier on DEN to SDF combined arrived on time 78.4% of the time across 1,095 flights, so UA 1479 is 12 points ahead of it. United flew 730 flights on the same city pair under all its flight numbers, including this one, and those ran 83.0% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1479 | 365 | 90.4% | 42 min | 0.55% | A+ |
| All United Airlines on DEN–SDF | 730 | 83.0% | 67 min | 0.68% | B+ |
| All carriers on DEN–SDF | 1,095 | 78.4% | 58 min | 0.82% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1479 quarter by quarter
Quarter by quarter UA 1479 held fairly steady: 90.0% in Jul–Sep 2025, 87.0% in Oct–Dec 2025, 87.5% in Jan–Mar 2026, 93.4% in Apr–Jun 2026 and 95.2% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202592 flights87.0%
- Jan–Mar 202690 flights87.5%
- Apr–Jun 202691 flights93.4%
- Jul–Sep 202662 flights95.2%
Scale runs 80% to 100%.
By weekday, UA 1479 did best on Tuesday at 96.2% on time and worst on Thursday at 82.7%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1479 runs when it is late
UA 1479 often beats the schedule: 124 of 363 completed flights, 34%, arrived 15 minutes or more early. The 35 late arrivals split 16 under half an hour, 13 between 30 and 60 minutes, and 6 an hour or more.
- 15+ min early124 flights34.2%
- Within 15 min204 flights56.2%
- 15–29 min late16 flights4.4%
- 30–59 min late13 flights3.6%
- 1–2 hours late5 flights1.4%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
7 of 29 late departures made up the time and arrived on time, 24% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for UA 1479
The latest arrival of the period was on 5 February 2026, 2 hours 17 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 February 2026 | 2 hours 17 minutes | Carrier |
| 23 November 2025 | 1 hour 46 minutes | Carrier |
| 20 July 2026 | 1 hour 43 minutes | Carrier |
| 3 May 2026 | 1 hour 16 minutes | National Airspace System |
| 11 December 2025 | 1 hour 2 minutes | National Airspace System |
Delay causes
Why UA 1479 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 1,477 reported delay minutes.
- 42%Carrier
- 33%National Airspace System
- 25%Late-arriving aircraft
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 619 of the 1,477 delay minutes reported here. The split is drawn from 1,477 delay minutes reported on UA 1479.
Cancellations are rare at 0.55%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 1.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,024 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 four other city pairs in the data, including SFO to DEN (180), ONT to DEN (24) and SEA to DEN (19), but none flew often enough under UA 1479 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to SDF only.
One caution: this is a thin sample. 365 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 1479
For a booking, UA 1479 has one of the better records a US domestic flight can show: 90.4% on time and 0.55% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to SDF, every carrier and departure
- SDF to DEN, the return direction
- Denver International (DEN) 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
- Worst months to fly in the US, ranked by the data
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.