Flight number record
UA 1829
United Airlines · Denver to Houston
- Route
- DEN → IAH
- Departs
- 13:25
- Flights
- 328
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1829, check with United Airlines.
UA 1829 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 328 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.6%, so UA 1829 runs 8 points behind the country as a whole. Across a thousand flights that is about 77 extra late arrivals.
Key figures
On time
69.9%
Arrivals under 15 minutes late, of 326 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.30%
National rate is 1.81%
1 hour+ late
9.2%
National rate is 8.1%
These figures cover 328 flights between July 2025 and June 2026. Beyond the headline rate, 9.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When UA 1829 flies
UA 1829 flies DEN to IAH without a single fixed slot. Its most common scheduled departure was 13:25, used on 150 of 328 flights, with 13:30 (99 flights) and 13:49 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 13:25150 flights45.7%
- Departs 13:3099 flights30.2%
- Departs 13:4944 flights13.4%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1829 runs 9 points worse at 69.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1829 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 1829 is 8 points behind 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 trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1829thin sample | 328 | 69.9% | 61 min | 0.30% | C+ |
| 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 1829 quarter by quarter
UA 1829 did not run the same all year. Its best quarter was Oct–Dec 2025 at 78.3% on time and its weakest Jul–Sep 2025 at 47.2%, a swing of 31 points on roughly 82 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 202555 flights47.2%
- Oct–Dec 202592 flights78.3%
- Jan–Mar 202690 flights76.7%
- Apr–Jun 202691 flights68.1%
Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1829 did best on Tuesday at 78.3% on time and worst on Saturday at 63.8%. Each day rests on about 47 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1829 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 5,934 reported delay minutes.
- 40%Carrier
- 37%National Airspace System
- 22%Late-arriving aircraft
37% 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 2,202 minutes out of 5,934, against a national NAS share of 21%. The split is drawn from 5,934 delay minutes reported on UA 1829.
Cancellations are rare at 0.30%, 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
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 eleven other city pairs in the data, including IAH to MIA (123), RNO to DEN (46) and RAP to DEN (41), but none flew often enough under UA 1829 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. 328 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 1829
For a booking, UA 1829 is one of the weaker ways to fly DEN to IAH: 8 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- DEN to IAH, every carrier and departure
- IAH to DEN, the return direction
- United Airlines 1720 on the same route89.6%
- United Airlines 320 on the same route96.4%
- United Airlines 475 on the same route73.6%
- United Airlines 2419 on the same route78.6%
- Frontier Airlines 2996 on the same route72.9%
- United Airlines 489 on the same route75.2%
- 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
- How often a connection fails at the major US hubs
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.