Flight number record

UA 1924

United Airlines · Denver to Washington

Route: DEN → IAD
Departs: 23:59
Flights: 340
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1924, check with United Airlines.

UA 1924 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 340 flights, with a median arrival 17 minutes early.

Set against the rest of the country, UA 1924's record is 16 points better than the US average of 77.6%. That gap is worth roughly 159 fewer late arrivals for every thousand flights.

On time

93.5%

Arrivals under 15 minutes late, of 336 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

1.18%

National rate is 1.81%

1 hour+ late

3.3%

National rate is 8.1%

These figures cover 340 flights between July 2025 and June 2026. The median arrival is 17 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 1924 flies

UA 1924 is scheduled to leave Denver (DEN) at 23:59 local time and reach Washington (IAD) at 05:22. That slot held for 340 of the 340 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 23:59340 flights100.0%

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 23:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and UA 1924 runs 23 points better at 93.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

UA 1924 next to DEN to IAD

Every carrier on DEN to IAD combined arrived on time 80.3% of the time across 3,558 flights, so UA 1924 is 13 points ahead of it. United flew 2,797 flights on the same city pair under all its flight numbers, including this one, and those ran 84.4% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 15 points.

UA 1924 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1924thin sample	340	93.5%	65 min	1.18%	A
All United Airlines on DEN–IAD	2,797	84.4%	70 min	0.46%	B+
All carriers on DEN–IAD	3,558	80.3%	64 min	0.56%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1924 quarter by quarter

UA 1924 did not run the same all year. Its best quarter was Oct–Dec 2025 at 98.9% on time and its weakest Jul–Sep 2025 at 85.4%, a swing of 14 points on roughly 85 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 202591 flights85.4%
Oct–Dec 202587 flights98.9%
Jan–Mar 202680 flights93.6%
Apr–Jun 202682 flights96.3%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1924 ranged from 88.5% on Monday to 97.8% on Wednesday. With about 49 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why UA 1924 runs late

One category carries most of the weight here. Carrier accounts for 47% of the 1,436 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
47%
Late-arriving aircraft
43%
National Airspace System
10%

43% 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 1,436 reported delay minutes here, that single category outweighs weather by 43 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 1,436 delay minutes reported on UA 1924.

Cancellations sit at 1.18% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.3% 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 1,452 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 three other city pairs in the data, including SBA to DEN (61), DFW to DEN (36) and RSW to DEN (8), but none flew often enough under UA 1924 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to IAD only.

One caution: this is a thin sample. 340 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 1924

For a booking, UA 1924 has one of the better records a US domestic flight can show: 93.5% on time and 1.18% 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