Flight number record
UA 1836
United Airlines · Denver to Milwaukee
- Route
- DEN → MKE
- Departs
- 09:57
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1836, check with United Airlines.
UA 1836 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 364 flights, with a median arrival 8 minutes early.
Set against the rest of the country, UA 1836's record is 8 points better than the US average of 77.3%. That gap is worth roughly 84 fewer late arrivals for every thousand flights.
Key figures
On time
85.7%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
43 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
1.9%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 8 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 1836 flies
UA 1836 flies DEN to MKE without a single fixed slot. Its most common scheduled departure was 09:57, used on 81 of 364 flights, with 11:35 (40 flights) and 10:05 (39 flights) next.
- Departs 09:5781 flights22.3%
- Departs 11:3540 flights11.0%
- Departs 10:0539 flights10.7%
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 09:57 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1836 runs level with that at 85.7%. 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 1836 next to DEN to MKE
Every carrier on DEN to MKE combined arrived on time 76.7% of the time across 2,307 flights, so UA 1836 is 9 points ahead of it. United flew 663 flights on the same city pair under all its flight numbers, including this one, and those ran 84.9% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1836thin sample | 364 | 85.7% | 43 min | 0.00% | A+ |
| All United Airlines on DEN–MKE | 663 | 84.9% | 62 min | 0.00% | B+ |
| All carriers on DEN–MKE | 2,307 | 76.7% | 62 min | 0.52% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1836 quarter by quarter
UA 1836 did not run the same all year. Its best quarter was Oct–Dec 2025 at 91.3% on time and its weakest Jul–Sep 2025 at 80.0%, a swing of 11 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 flights80.0%
- Oct–Dec 202592 flights91.3%
- Jan–Mar 202690 flights83.1%
- Apr–Jun 202691 flights87.9%
- Jul–Sep 202661 flights80.3%
Scale runs 70% to 95%.
By weekday, UA 1836 did best on Thursday at 92.3% on time and worst on Friday at 75.0%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1836 runs when it is late
UA 1836 often beats the schedule: 97 of 363 completed flights, 27%, arrived 15 minutes or more early. Most of the lateness is short. 28 of the 52 late arrivals were under half an hour behind, and 7 reached an hour or more.
- 15+ min early97 flights26.7%
- Within 15 min214 flights59.0%
- 15–29 min late28 flights7.7%
- 30–59 min late17 flights4.7%
- 1–2 hours late4 flights1.1%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
10 of 46 late departures made up the time and arrived on time, 22% of them. 16 flights left on time and still arrived late.
The worst days
Worst days for UA 1836
The latest arrival of the period was on 19 December 2025, 3 hours 44 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across December, August, March and September, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 3 hours 44 minutes | Late-arriving aircraft |
| 8 August 2026 | 3 hours 25 minutes | Late-arriving aircraft |
| 25 August 2026 | 2 hours 31 minutes | Carrier |
| 6 March 2026 | 1 hour 58 minutes | National Airspace System |
| 20 September 2025 | 1 hour 45 minutes | Carrier |
Delay causes
Why UA 1836 runs late
Late-arriving aircraft accounts for 45% of the 2,224 delay minutes carriers reported here, and the remaining four split what is left.
- 45%Late-arriving aircraft
- 35%Carrier
- 20%National Airspace System
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,224 reported delay minutes here, that single category outweighs weather by 45 to one. The split is drawn from 2,224 delay minutes reported on UA 1836.
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
Badly late arrivals are rare here: only 1.9% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 896 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 two other city pairs in the data, including PBI to DEN (26) and SAN to DEN (19), but none flew often enough under UA 1836 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to MKE only.
One caution: this is a thin sample. 364 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 1836
For a booking, UA 1836 has one of the better records a US domestic flight can show: 85.7% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to MKE, every carrier and departure
- MKE to DEN, the return direction
- Denver International (DEN) delay statistics
- Milwaukee Mitchell International (MKE) 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
- Why the first flight of the morning is statistically safest
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.