Flight number record

UA 2329

United Airlines · Denver to Chicago

Route: DEN → ORD
Departs: 09:35
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2329, check with United Airlines.

UA 2329 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 flights, with a median arrival 1 minute early.

Set against the rest of the country, UA 2329's record is 7 points better than the US average of 77.3%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.

On time

84.1%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

82 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.89%

1 hour+ late

5.8%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 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.

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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 186 of 365 flights, with 09:36 (72 flights) and 09:40 (61 flights) next.

Departs 09:35186 flights51.0%
Departs 09:3672 flights19.7%
Departs 09:4061 flights16.7%

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 09:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 2329 runs level with that at 84.1%. 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 2329 next to DEN to ORD

Every carrier on DEN to ORD combined arrived on time 71.8% of the time across 6,109 flights, so UA 2329 is 12 points ahead of it. United flew 3,885 flights on the same city pair under all its flight numbers, including this one, and those ran 71.9% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 5 points.

UA 2329 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2329	365	84.1%	82 min	0.55%	B+
All United Airlines on DEN–ORD	3,885	71.9%	82 min	0.82%	C+
All carriers on DEN–ORD	6,109	71.8%	88 min	1.11%	C
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 2329 quarter by quarter

UA 2329 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Apr–Jun 2026 at 76.7%, a swing of 17 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 flights93.3%
Oct–Dec 202592 flights88.9%
Jan–Mar 202690 flights84.3%
Apr–Jun 202691 flights76.7%
Jul–Sep 202662 flights83.3%

Scale runs 70% to 100%.

By weekday, UA 2329 ranged from 80.8% on Thursday to 88.5% on Monday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late UA 2329 runs when it is late

The 57 late arrivals split 23 under half an hour, 13 between 30 and 60 minutes, and 21 an hour or more.

15+ min early56 flights15.6%
Within 15 min246 flights68.5%
15–29 min late23 flights6.4%
30–59 min late13 flights3.6%
1–2 hours late7 flights1.9%
2+ hours late14 flights3.9%

Scale runs 0% to 100%.

Share of 359 completed flights by arrival against schedule.

7 of 44 late departures made up the time and arrived on time, 16% of them. In the other direction, 20 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 ORD.

The worst days

Worst days for UA 2329

The latest arrival of the period was on 2 October 2025, 7 hours 14 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of UA 2329 in the period
Date	Arrived late by	Largest filed cause
2 October 2025	7 hours 14 minutes	Carrier
6 March 2026	6 hours 43 minutes	Extreme weather
2 August 2026	5 hours 35 minutes	Late-arriving aircraft
11 August 2026	5 hours 10 minutes	Late-arriving aircraft
25 November 2025	3 hours 27 minutes	Late-arriving aircraft

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 4,655 reported delay minutes.

National Airspace System
38%
Carrier
29%
Late-arriving aircraft
22%
Extreme weather
11%

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 1.9 times the usual weather exposure. The split is drawn from 4,655 delay minutes reported on UA 2329.

Cancellations are rare at 0.55%, 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

5.8% of arrivals land an hour or more late, close to the national 8.3%, so 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.

The same number turns up on ten other city pairs in the data, including SBP to DEN (237), RNO to DEN (68) and ORD to LGA (62), 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 84.1% on time with 0.55% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures