Flight number record
UA 1615
United Airlines · Denver to Cincinnati
- Route
- DEN → CVG
- Departs
- 17:40
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1615, check with United Airlines.
UA 1615 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 363 flights, with a median arrival 3 minutes early.
Key figures
On time
75.3%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
6.6%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. The median arrival is 3 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 1615 flies
UA 1615 flies DEN to CVG without a single fixed slot. Its most common scheduled departure was 17:40, used on 74 of 363 flights, with 17:34 (57 flights) and 17:41 (53 flights) next.
- Departs 17:4074 flights20.4%
- Departs 17:3457 flights15.7%
- Departs 17:4153 flights14.6%
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 17:40 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1615 runs 7 points better at 75.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 1615 next to DEN to CVG
Every carrier on DEN to CVG combined arrived on time 79.8% of the time across 1,496 flights, so UA 1615 is 5 points behind it. United flew 727 flights on the same city pair under all its flight numbers, including this one, and those ran 84.4% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1615thin sample | 363 | 75.3% | 58 min | 0.55% | B+ |
| All United Airlines on DEN–CVG | 727 | 84.4% | 60 min | 0.41% | B+ |
| All carriers on DEN–CVG | 1,496 | 79.8% | 55 min | 0.74% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1615 quarter by quarter
UA 1615 did not run the same all year. Its best quarter was Oct–Dec 2025 at 82.4% on time and its weakest Jul–Sep 2026 at 60.7%, a swing of 22 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 flights73.3%
- Oct–Dec 202591 flights82.4%
- Jan–Mar 202690 flights75.3%
- Apr–Jun 202691 flights78.9%
- Jul–Sep 202661 flights60.7%
Scale runs 50% to 90%.
By weekday, UA 1615 did best on Tuesday at 80.8% on time and worst on Sunday at 67.3%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1615 runs when it is late
The 89 late arrivals split 34 under half an hour, 31 between 30 and 60 minutes, and 24 an hour or more.
- 15+ min early79 flights21.9%
- Within 15 min193 flights53.5%
- 15–29 min late34 flights9.4%
- 30–59 min late31 flights8.6%
- 1–2 hours late16 flights4.4%
- 2+ hours late8 flights2.2%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
11 of 77 late departures made up the time and arrived on time, 14% of them. In the other direction, 23 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 CVG.
The worst days
Worst days for UA 1615
The latest arrival of the period was on 14 August 2026, 7 hours 11 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 August 2026 | 7 hours 11 minutes | Late-arriving aircraft |
| 10 July 2026 | 5 hours 26 minutes | Late-arriving aircraft |
| 17 February 2026 | 3 hours 20 minutes | Late-arriving aircraft |
| 8 June 2026 | 3 hours 20 minutes | Late-arriving aircraft |
| 22 July 2026 | 2 hours 55 minutes | Late-arriving aircraft |
Delay causes
Why UA 1615 runs late
Late-arriving aircraft accounts for 51% of the 5,170 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 28%Carrier
- 18%National Airspace System
- 4%Extreme weather
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,170 reported delay minutes here, that single category outweighs weather by 14 to one. The split is drawn from 5,170 delay minutes reported on UA 1615.
Cancellations are rare at 0.55%, 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
6.6% 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 about an hour, which a normal layover absorbs.
The 1,069 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 PHX to DEN (82) and MFR to DEN (31), but none flew often enough under UA 1615 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to CVG only.
One caution: this is a thin sample. 363 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 1615
For a booking, read UA 1615 as 75.3% on time with 0.55% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to CVG, every carrier and departure
- CVG to DEN, the return direction
- United Airlines 1978 on the same route93.3%
- Denver International (DEN) delay statistics
- Cincinnati/Northern Kentucky International (CVG) 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.