Flight number record
UA 2643
United Airlines · Denver to Hartford
- Route
- DEN → BDL
- Departs
- 10:02
- Flights
- 293
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs about 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 77.6%. That gap is worth roughly 97 fewer late arrivals for every thousand flights.
Key figures
On time
87.3%
Arrivals under 15 minutes late, of 292 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
0.34%
National rate is 1.81%
1 hour+ late
2.7%
National rate is 8.1%
These figures cover 293 flights between July 2025 and June 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.
Schedule
When UA 2643 flies
UA 2643 flies DEN to BDL without a single fixed slot. Its most common scheduled departure was 10:02, used on 86 of 293 flights, with 10:05 (63 flights) and 09:45 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 10:0286 flights29.4%
- Departs 10:0563 flights21.5%
- Departs 09:4541 flights14.0%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 10:02 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 2643 runs 3 points better at 87.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
UA 2643 next to DEN to BDL
Every carrier on DEN to BDL combined arrived on time 74.9% of the time across 922 flights, so UA 2643 is 12 points ahead of it. United flew 728 flights on the same city pair under all its flight numbers, including this one, and those ran 80.6% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2643thin sample | 293 | 87.3% | 45 min | 0.34% | A+ |
| All United Airlines on DEN–BDL | 728 | 80.6% | 60 min | 0.82% | B+ |
| All carriers on DEN–BDL | 922 | 74.9% | 58 min | 1.41% | C |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 2643 quarter by quarter
Quarter by quarter UA 2643 held fairly steady: 83.7% in Jul–Sep 2025, 91.9% in Oct–Dec 2025, 85.1% in Jan–Mar 2026 and 89.0% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202592 flights83.7%
- Oct–Dec 202562 flights91.9%
- Jan–Mar 202648 flights85.1%
- Apr–Jun 202691 flights89.0%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2643 ranged from 83.3% on Saturday to 92.9% on Sunday. With about 42 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why UA 2643 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 44% of the 1,663 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 44%Late-arriving aircraft
- 38%Carrier
- 18%National Airspace System
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 1,663 reported delay minutes here, that single category outweighs weather by 44 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 1,663 delay minutes reported on UA 2643.
Cancellations are rare at 0.34%, below the national 1.81% 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 2.7% land an hour or more behind schedule, against 8.1% 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 (224) and IAH to DEN (94), 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: 87.3% 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.