Flight number record
UA 1720
United Airlines · Denver to Houston
- Route
- DEN → IAH
- Departs
- 07:45
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 45 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 13 points better than the US average of 77.3%. That gap is worth roughly 128 fewer late arrivals for every thousand flights.
Key figures
On time
90.1%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
43 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
2.2%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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Schedule
When UA 1720 flies
UA 1720 flies DEN to IAH without a single fixed slot. Its most common scheduled departure was 07:45, used on 262 of 365 flights, with 07:42 (80 flights) next.
- Departs 07:45262 flights71.8%
- Departs 07:4280 flights21.9%
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 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 90.1%. 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 1720 next to DEN to IAH
Every carrier on DEN to IAH combined arrived on time 79.6% of the time across 4,728 flights, so UA 1720 is 11 points ahead of it. United flew 3,894 flights on the same city pair under all its flight numbers, including this one, and those ran 79.7% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1720 | 365 | 90.1% | 43 min | 0.27% | A+ |
| All United Airlines on DEN–IAH | 3,894 | 79.7% | 63 min | 0.26% | B+ |
| All carriers on DEN–IAH | 4,728 | 79.6% | 62 min | 0.30% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1720 quarter by quarter
UA 1720 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Apr–Jun 2026 at 85.7%, a swing of 11 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.
- Jul–Sep 202530 flights96.7%
- Oct–Dec 202592 flights90.1%
- Jan–Mar 202690 flights91.1%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights91.9%
Scale runs 75% to 100%.
By weekday, UA 1720 ranged from 84.6% on Friday to 94.1% on Tuesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1720 runs when it is late
UA 1720 often beats the schedule: 124 of 364 completed flights, 34%, arrived 15 minutes or more early. Most of the lateness is short. 18 of the 36 late arrivals were under half an hour behind, and 8 reached an hour or more.
- 15+ min early124 flights34.1%
- Within 15 min204 flights56.0%
- 15–29 min late18 flights4.9%
- 30–59 min late10 flights2.7%
- 1–2 hours late5 flights1.4%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 364 completed flights by arrival against schedule.
4 of 27 late departures made up the time and arrived on time, 15% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for UA 1720
The latest arrival of the period was on 2 November 2025, 2 hours 57 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 November 2025 | 2 hours 57 minutes | Late-arriving aircraft |
| 7 August 2026 | 2 hours 35 minutes | Late-arriving aircraft |
| 30 August 2026 | 2 hours 4 minutes | Late-arriving aircraft |
| 14 August 2026 | 1 hour 32 minutes | National Airspace System |
| 16 March 2026 | 1 hour 22 minutes | National Airspace System |
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 1,563 reported delay minutes.
- 35%Late-arriving aircraft
- 33%National Airspace System
- 32%Carrier
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,563 reported delay minutes here, that single category outweighs weather by 35 to one. The split is drawn from 1,563 delay minutes reported on UA 1720.
Cancellations are rare at 0.27%, 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 2.2% 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 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.
The same number turns up on three other city pairs in the data, including IAH to BWI (194), 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: 90.1% on time and 0.27% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to IAH, every carrier and departure
- IAH to DEN, the return direction
- United Airlines 475 on the same route74.1%
- United Airlines 320 on the same route96.7%
- United Airlines 1829 on the same route71.2%
- United Airlines 489 on the same route77.9%
- United Airlines 2419 on the same route78.9%
- Frontier Airlines 2996 on the same route73.9%
- Denver International (DEN) delay statistics
- George Bush Intercontinental (IAH) 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.