Flight number record
UA 2865
United Airlines · Denver to Chicago
- Route
- DEN → ORD
- Departs
- 11:15
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2865, check with United Airlines.
UA 2865 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 365 flights, with a median arrival 2 minutes early.
Key figures
On time
79.2%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
7.8%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 2 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 2865 flies
UA 2865 flies DEN to ORD without a single fixed slot. Its most common scheduled departure was 11:15, used on 276 of 365 flights, with 11:20 (49 flights) next.
- Departs 11:15276 flights75.6%
- Departs 11:2049 flights13.4%
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 11:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 2865 runs level with that at 79.2%. 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 2865 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 2865 is 7 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%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2865 | 365 | 79.2% | 79 min | 0.00% | 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 2865 quarter by quarter
Quarter by quarter UA 2865 held fairly steady: 80.0% in Jul–Sep 2025, 80.4% in Oct–Dec 2025, 78.7% in Jan–Mar 2026, 78.9% in Apr–Jun 2026 and 78.3% in Jul–Sep 2026. A spread of 2 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights80.0%
- Oct–Dec 202592 flights80.4%
- Jan–Mar 202690 flights78.7%
- Apr–Jun 202691 flights78.9%
- Jul–Sep 202662 flights78.3%
Scale runs 70% to 85%.
By weekday, UA 2865 did best on Thursday at 84.6% on time and worst on Sunday at 69.2%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2865 runs when it is late
The 75 late arrivals split 29 under half an hour, 18 between 30 and 60 minutes, and 28 an hour or more.
- 15+ min early42 flights11.6%
- Within 15 min244 flights67.6%
- 15–29 min late29 flights8.0%
- 30–59 min late18 flights5.0%
- 1–2 hours late13 flights3.6%
- 2+ hours late15 flights4.2%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
11 of 61 late departures made up the time and arrived on time, 18% of them. In the other direction, 25 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 2865
The latest arrival of the period was on 15 March 2026, 8 hours 55 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 March 2026 | 8 hours 55 minutes | National Airspace System |
| 29 November 2025 | 6 hours | Late-arriving aircraft |
| 17 June 2026 | 4 hours 38 minutes | National Airspace System |
| 3 July 2026 | 4 hours 7 minutes | National Airspace System |
| 21 June 2026 | 4 hours 5 minutes | Carrier |
Delay causes
Why UA 2865 runs late
National Airspace System accounts for 58% of the 5,895 delay minutes carriers reported here, and the remaining four split what is left.
- 58%National Airspace System
- 26%Late-arriving aircraft
- 16%Carrier
- 0%Extreme weather
58% 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 3,400 minutes out of 5,895, against a national NAS share of 21%. The split is drawn from 5,895 delay minutes reported on UA 2865.
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
7.8% 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 six other city pairs in the data, including SBA to DEN (237), ORD to BNA (205) and ORD to TPA (46), but none flew often enough under UA 2865 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 2865
For a booking, read UA 2865 as 79.2% on time with 0.00% 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 2329 on the same route84.1%
- United Airlines 1023 on the same route59.8%
- United Airlines 617 on the same route68.8%
- United Airlines 1377 on the same route90.0%
- American Airlines 2771 on the same route87.9%
- United Airlines 2258 on the same route71.2%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.