Flight number record
UA 2643
United Airlines · Denver to Hartford
- Route
- DEN → BDL
- Departs
- 09:45
- Flights
- 293
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2643, check with United Airlines.
UA 2643 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 293 flights, with a median arrival 8 minutes early.
Set against the rest of the country, UA 2643's record is 10 points better than the US average of 77.3%. That gap is worth roughly 97 fewer late arrivals for every thousand flights.
Key figures
On time
87.0%
Arrivals under 15 minutes late, of 292 completed flights
Avg delay
44 min
Across delayed arrivals only, not all flights
Cancelled
0.34%
National rate is 1.89%
1 hour+ late
3.1%
National rate is 8.3%
These figures cover 293 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 2643 flies
UA 2643 flies DEN to BDL without a single fixed slot. Its most common scheduled departure was 09:45, used on 81 of 293 flights, with 10:05 (63 flights) and 09:41 (32 flights) next.
- Departs 09:4581 flights27.6%
- Departs 10:0563 flights21.5%
- Departs 09:4132 flights10.9%
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 09:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 2643 runs 3 points better at 87.0%. 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 2643 next to DEN to BDL
Every carrier on DEN to BDL combined arrived on time 75.2% of the time across 887 flights, so UA 2643 is 12 points ahead of it. United flew 727 flights on the same city pair under all its flight numbers, including this one, and those ran 79.3% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2643thin sample | 293 | 87.0% | 44 min | 0.34% | A+ |
| All United Airlines on DEN–BDL | 727 | 79.3% | 57 min | 0.83% | B+ |
| All carriers on DEN–BDL | 887 | 75.2% | 55 min | 1.24% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2643 quarter by quarter
UA 2643 did not run the same all year. Its best quarter was Oct–Dec 2025 at 91.9% on time and its weakest Jul–Sep 2025 at 76.7%, a swing of 15 points on roughly 59 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 flights76.7%
- Oct–Dec 202562 flights91.9%
- Jan–Mar 202648 flights85.1%
- Apr–Jun 202691 flights89.0%
- Jul–Sep 202662 flights85.5%
Scale runs 70% to 95%.
By weekday, UA 2643 did best on Wednesday at 92.7% on time and worst on Tuesday at 80.5%. Each day rests on about 42 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2643 runs when it is late
UA 2643 often beats the schedule: 101 of 292 completed flights, 35%, arrived 15 minutes or more early. Most of the lateness is short. 19 of the 38 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early101 flights34.6%
- Within 15 min153 flights52.4%
- 15–29 min late19 flights6.5%
- 30–59 min late10 flights3.4%
- 1–2 hours late8 flights2.7%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 292 completed flights by arrival against schedule.
9 of 35 late departures made up the time and arrived on time, 26% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for UA 2643
The latest arrival of the period was on 26 May 2026, 3 hours 7 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 May 2026 | 3 hours 7 minutes | Late-arriving aircraft |
| 17 November 2025 | 1 hour 49 minutes | Late-arriving aircraft |
| 6 April 2026 | 1 hour 23 minutes | Carrier |
| 26 July 2026 | 1 hour 21 minutes | Carrier |
| 11 April 2026 | 1 hour 18 minutes | Carrier |
Delay causes
Why UA 2643 runs late
Carrier accounts for 44% of the 1,655 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 37%Late-arriving aircraft
- 19%National Airspace System
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,655 reported delay minutes here, that single category outweighs weather by 37 to one. The split is drawn from 1,655 delay minutes reported on UA 2643.
Cancellations are rare at 0.34%, 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 3.1% 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.
At 1,671 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on two other city pairs in the data, including SLC to DEN (162) and IAH to DEN (135), but none flew often enough under UA 2643 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to BDL only.
One caution: this is a thin sample. 293 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 2643
For a booking, UA 2643 has one of the better records a US domestic flight can show: 87.0% on time and 0.34% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to BDL, every carrier and departure
- BDL to DEN, the return direction
- United Airlines 2254 on the same route70.4%
- Denver International (DEN) 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.