Flight number record

UA 1479

United Airlines · Denver to Louisville

Route: DEN → SDF
Departs: 09:45
Flights: 316
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 40 minutes. That rests on 316 flights, with a median arrival 9 minutes early.

Set against the rest of the country, UA 1479's record is 12 points better than the US average of 77.6%. That gap is worth roughly 119 fewer late arrivals for every thousand flights.

On time

89.5%

Arrivals under 15 minutes late, of 314 completed flights

Avg delay

40 min

Across delayed arrivals only, not all flights

Cancelled

0.63%

National rate is 1.81%

1 hour+ late

1.6%

National rate is 8.1%

These figures cover 316 flights between July 2025 and June 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.

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 84 of 316 flights, with 09:40 (82 flights) and 09:49 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:4584 flights26.6%
Departs 09:4082 flights25.9%
Departs 09:4949 flights15.5%

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 09:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 1479 runs 5 points better at 89.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

UA 1479 next to DEN to SDF

Every carrier on DEN to SDF combined arrived on time 75.8% of the time across 1,102 flights, so UA 1479 is 14 points ahead of it. United flew 731 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 11 points.

UA 1479 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1479thin sample	316	89.5%	40 min	0.63%	A+
All United Airlines on DEN–SDF	731	80.9%	63 min	0.55%	B+
All carriers on DEN–SDF	1,102	75.8%	62 min	0.82%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1479 quarter by quarter

Quarter by quarter UA 1479 held fairly steady: 90.7% in Jul–Sep 2025, 87.0% in Oct–Dec 2025, 87.5% in Jan–Mar 2026 and 93.4% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202543 flights90.7%
Oct–Dec 202592 flights87.0%
Jan–Mar 202690 flights87.5%
Apr–Jun 202691 flights93.4%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1479 did best on Tuesday at 95.7% on time and worst on Thursday at 82.2%. Each day rests on about 45 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

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 1,334 reported delay minutes.

Carrier
38%
National Airspace System
37%
Late-arriving aircraft
25%

The largest share of delay minutes, 38%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 509 of the 1,334 delay minutes reported here. The split is drawn from 1,334 delay minutes reported on UA 1479.

Cancellations are rare at 0.63%, below the national 1.81% 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 1.6% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on six other city pairs in the data, including SFO to DEN (118), DEN to BNA (49) and ONT to DEN (37), 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. 316 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: 89.5% on time and 0.63% cancelled. That is a base rate, not a promise about any single day.

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures