Flight number record
UA 2329
United Airlines · Denver to Chicago
- Route
- DEN → ORD
- Departs
- 09:35
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2329, check with United Airlines.
UA 2329 lands a B, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 1 minute early.
Set against the rest of the country, UA 2329's record is 5 points better than the US average of 77.6%. That gap is worth roughly 46 fewer late arrivals for every thousand flights.
Key figures
On time
82.2%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.81%
1 hour+ late
6.4%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Schedule
When UA 2329 flies
UA 2329 flies DEN to ORD without a single fixed slot. Its most common scheduled departure was 09:35, used on 145 of 365 flights, with 09:40 (123 flights) and 09:36 (72 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 09:35145 flights39.7%
- Departs 09:40123 flights33.7%
- Departs 09:3672 flights19.7%
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 09:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 2329 runs level with that at 82.2%. 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 2329 next to DEN to ORD
Every carrier on DEN to ORD combined arrived on time 71.1% of the time across 6,161 flights, so UA 2329 is 11 points ahead of it. United flew 3,756 flights on the same city pair under all its flight numbers, including this one, and those ran 71.4% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2329 | 365 | 82.2% | 75 min | 1.10% | B |
| All United Airlines on DEN–ORD | 3,756 | 71.4% | 79 min | 0.75% | C+ |
| All carriers on DEN–ORD | 6,161 | 71.1% | 88 min | 1.07% | C |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 2329 quarter by quarter
UA 2329 did not run the same all year. Its best quarter was Oct–Dec 2025 at 88.9% on time and its weakest Apr–Jun 2026 at 76.7%, a swing of 12 points on roughly 91 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 202592 flights78.9%
- Oct–Dec 202592 flights88.9%
- Jan–Mar 202690 flights84.3%
- Apr–Jun 202691 flights76.7%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2329 did best on Sunday at 88.0% on time and worst on Tuesday at 75.5%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2329 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 4,765 reported delay minutes.
- 37%National Airspace System
- 33%Carrier
- 19%Late-arriving aircraft
- 11%Extreme weather
Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.8 times the usual weather exposure. The split is drawn from 4,765 delay minutes reported on UA 2329.
Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.55%.
Connections and routes
What a delay on this flight costs
6.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The 888 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 SBP to DEN (175), ORD to DTW (110) and RNO to DEN (68), but none flew often enough under UA 2329 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to ORD 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 2329
For a booking, read UA 2329 as 82.2% on time with 1.10% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to ORD, every carrier and departure
- ORD to DEN, the return direction
- United Airlines 2865 on the same route78.2%
- United Airlines 1023 on the same route59.8%
- United Airlines 617 on the same route66.5%
- United Airlines 1377 on the same route87.4%
- American Airlines 2771 on the same route87.5%
- United Airlines 2258 on the same route67.8%
- Denver International (DEN) delay statistics
- Chicago O'Hare International (ORD) 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
- Worst months to fly in the US, ranked by the data
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.