Flight number record
UA 1829
United Airlines · Denver to Houston
- Route
- DEN → IAH
- Departs
- 13:25
- Flights
- 341
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 341 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so UA 1829 runs 6 points behind the country as a whole. Across a thousand flights that is about 61 extra late arrivals.
Key figures
On time
71.2%
Arrivals under 15 minutes late, of 340 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
9.1%
National rate is 8.3%
These figures cover 341 flights between September 2025 and August 2026. Beyond the headline rate, 9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 149 of 341 flights, with 13:30 (140 flights) next.
- Departs 13:25149 flights43.7%
- Departs 13:30140 flights41.1%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1829 runs 7 points worse at 71.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1829 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 1829 is 8 points behind 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 trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1829thin sample | 341 | 71.2% | 59 min | 0.00% | C+ |
| 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 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 2026 at 57.4%, a swing of 21 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 20256 flights—
- Oct–Dec 202592 flights78.3%
- Jan–Mar 202690 flights76.7%
- Apr–Jun 202691 flights68.1%
- Jul–Sep 202662 flights57.4%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1829 did best on Tuesday at 81.2% on time and worst on Saturday at 63.3%. Each day rests on about 49 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1829 runs when it is late
The 98 late arrivals split 40 under half an hour, 27 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early48 flights14.1%
- Within 15 min194 flights57.1%
- 15–29 min late40 flights11.8%
- 30–59 min late27 flights7.9%
- 1–2 hours late21 flights6.2%
- 2+ hours late10 flights2.9%
Scale runs 0% to 100%.
Share of 340 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 68 departures that left 15 minutes late or more, only 8 made it up before arrival. In the other direction, 38 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at IAH.
The worst days
Worst days for UA 1829
The latest arrival of the period was on 7 May 2026, 5 hours 14 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across May, March, April and September, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 May 2026 | 5 hours 14 minutes | Late-arriving aircraft |
| 6 March 2026 | 5 hours 11 minutes | Carrier |
| 16 March 2026 | 4 hours 33 minutes | National Airspace System |
| 30 April 2026 | 4 hours 8 minutes | Carrier |
| 28 September 2025 | 3 hours 37 minutes | Late-arriving aircraft |
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 5,790 reported delay minutes.
- 41%Carrier
- 32%National Airspace System
- 27%Late-arriving aircraft
- 0%Extreme weather
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,359 of the 5,790 delay minutes reported here. The split is drawn from 5,790 delay minutes reported on UA 1829.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
The same number turns up on ten other city pairs in the data, including IAH to MIA (154), RAP to DEN (82) and RNO to DEN (46), 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. 341 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 route90.1%
- United Airlines 475 on the same route74.1%
- United Airlines 320 on the same route96.7%
- 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
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.