Flight number record

UA 1720

United Airlines · Denver to Houston

Route: DEN → IAH
Departs: 07:45
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1720, check with United Airlines.

UA 1720 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 roughly 35 minutes. That rests on 365 flights, with a median arrival 11 minutes early.

Set against the rest of the country, UA 1720's record is 12 points better than the US average of 77.6%. That gap is worth roughly 120 fewer late arrivals for every thousand flights.

On time

89.6%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

37 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.81%

1 hour+ late

1.6%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 11 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 1720 flies

UA 1720 is scheduled to leave Denver (DEN) at 07:45 local time and reach Houston (IAH) at 11:15. That slot held for 324 of the 365 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 07:45324 flights88.8%
Departs 07:4241 flights11.2%

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 07:45 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 1720 runs level with that at 89.6%. 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 1720 next to DEN to IAH

Every carrier on DEN to IAH combined arrived on time 78.2% of the time across 4,673 flights, so UA 1720 is 11 points ahead of it. United flew 3,875 flights on the same city pair under all its flight numbers, including this one, and those ran 78.0% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 11 points.

UA 1720 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1720	365	89.6%	37 min	0.27%	A+
All United Airlines on DEN–IAH	3,875	78.0%	62 min	0.23%	B+
All carriers on DEN–IAH	4,673	78.2%	62 min	0.21%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1720 quarter by quarter

Quarter by quarter UA 1720 held fairly steady: 91.3% in Jul–Sep 2025, 90.1% in Oct–Dec 2025, 91.1% in Jan–Mar 2026 and 85.7% 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 202592 flights91.3%
Oct–Dec 202592 flights90.1%
Jan–Mar 202690 flights91.1%
Apr–Jun 202691 flights85.7%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1720 ranged from 84.6% on Friday to 96.2% on Tuesday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why UA 1720 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 1,401 reported delay minutes.

National Airspace System
36%
Carrier
33%
Late-arriving aircraft
25%
Extreme weather
6%

36% 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 506 minutes out of 1,401, against a national NAS share of 21%. The split is drawn from 1,401 delay minutes reported on UA 1720.

Cancellations are rare at 0.27%, 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 861 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 IAH to BWI (132), RAP to DEN (34) and IAH to PIT (4), but none flew often enough under UA 1720 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to IAH 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 1720

For a booking, UA 1720 has one of the better records a US domestic flight can show: 89.6% on time and 0.27% 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