Flight number record
UA 1101
United Airlines · Denver to Washington
- Route
- DEN → IAD
- Departs
- 08:00
- Flights
- 323
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1101, check with United Airlines.
UA 1101 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 323 flights, with a median arrival 12 minutes early.
Set against the rest of the country, UA 1101's record is 17 points better than the US average of 77.3%. That gap is worth roughly 165 fewer late arrivals for every thousand flights.
Key figures
On time
93.8%
Arrivals under 15 minutes late, of 322 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.31%
National rate is 1.89%
1 hour+ late
1.6%
National rate is 8.3%
These figures cover 323 flights between September 2025 and August 2026. The median arrival is 12 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 1101 flies
UA 1101 flies DEN to IAD without a single fixed slot. Its most common scheduled departure was 08:00, used on 163 of 323 flights, with 07:45 (61 flights) and 07:50 (50 flights) next.
- Departs 08:00163 flights50.5%
- Departs 07:4561 flights18.9%
- Departs 07:5050 flights15.5%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1101 runs 10 points better at 93.8%. 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 1101 next to DEN to IAD
Every carrier on DEN to IAD combined arrived on time 81.8% of the time across 3,385 flights, so UA 1101 is 12 points ahead of it. United flew 2,790 flights on the same city pair under all its flight numbers, including this one, and those ran 84.8% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1101thin sample | 323 | 93.8% | 58 min | 0.31% | A+ |
| All United Airlines on DEN–IAD | 2,790 | 84.8% | 66 min | 0.50% | B+ |
| All carriers on DEN–IAD | 3,385 | 81.8% | 60 min | 0.59% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1101 quarter by quarter
Quarter by quarter UA 1101 held fairly steady: 96.7% in Jul–Sep 2025, 93.5% in Oct–Dec 2025, 92.6% in Jan–Mar 2026, 95.7% in Apr–Jun 2026 and 91.9% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights96.7%
- Oct–Dec 202592 flights93.5%
- Jan–Mar 202669 flights92.6%
- Apr–Jun 202670 flights95.7%
- Jul–Sep 202662 flights91.9%
Scale runs 85% to 100%.
By weekday, UA 1101 ranged from 87.2% on Monday to 97.8% on Wednesday. With about 46 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1101 runs when it is late
UA 1101 often beats the schedule: 130 of 322 completed flights, 40%, arrived 15 minutes or more early. The 20 late arrivals split 9 under half an hour, 6 between 30 and 60 minutes, and 5 an hour or more.
- 15+ min early130 flights40.4%
- Within 15 min172 flights53.4%
- 15–29 min late9 flights2.8%
- 30–59 min late6 flights1.9%
- 1–2 hours late3 flights0.9%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 322 completed flights by arrival against schedule.
Only 16 of 322 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for UA 1101
The latest arrival of the period was on 25 July 2026, 4 hours 26 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 July 2026 | 4 hours 26 minutes | Late-arriving aircraft |
| 25 May 2026 | 2 hours | Late-arriving aircraft |
| 28 December 2025 | 1 hour 50 minutes | Late-arriving aircraft |
| 26 January 2026 | 1 hour 41 minutes | National Airspace System |
| 10 August 2026 | 1 hour 13 minutes | Late-arriving aircraft |
Delay causes
Why UA 1101 runs late
Late-arriving aircraft accounts for 54% of the 1,151 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 34%National Airspace System
- 12%Carrier
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,151 reported delay minutes here, that single category outweighs weather by 54 to one. The split is drawn from 1,151 delay minutes reported on UA 1101.
Cancellations are rare at 0.31%, 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
Badly late arrivals are rare here: only 1.6% 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 1,452 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 IAD to MCO (103) and DEN to BOS (21), but none flew often enough under UA 1101 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to IAD only.
One caution: this is a thin sample. 323 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 1101
For a booking, UA 1101 has one of the better records a US domestic flight can show: 93.8% on time and 0.31% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to IAD, every carrier and departure
- IAD to DEN, the return direction
- United Airlines 2408 on the same route71.6%
- United Airlines 2087 on the same route81.4%
- United Airlines 1924 on the same route93.8%
- United Airlines 347 on the same route87.0%
- Denver International (DEN) delay statistics
- Washington Dulles International (IAD) 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.