Flight number record

UA 1615

United Airlines · Denver to Cincinnati

Route: DEN → CVG
Departs: 17:34
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1615, check with United Airlines.

UA 1615 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land roughly 50 minutes behind schedule. That rests on 364 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.6%, so UA 1615 runs 5 points behind the country as a whole. Across a thousand flights that is about 49 extra late arrivals.

On time

72.7%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

52 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

7.5%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 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.

Schedule

When UA 1615 flies

UA 1615 flies DEN to CVG without a single fixed slot. Its most common scheduled departure was 17:34, used on 57 of 364 flights, with 17:41 (53 flights) and 17:40 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:3457 flights15.7%
Departs 17:4153 flights14.6%
Departs 17:4047 flights12.9%

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 17:34 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1615 runs 5 points better at 72.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

UA 1615 next to DEN to CVG

Every carrier on DEN to CVG combined arrived on time 77.6% of the time across 1,520 flights, so UA 1615 is 5 points behind it. United flew 728 flights on the same city pair under all its flight numbers, including this one, and those ran 82.7% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 6 points.

UA 1615 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1615thin sample	364	72.7%	52 min	0.55%	C+
All United Airlines on DEN–CVG	728	82.7%	54 min	0.55%	B+
All carriers on DEN–CVG	1,520	77.6%	57 min	0.86%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	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 2025 at 54.3%, a swing of 28 points on roughly 91 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 202592 flights54.3%
Oct–Dec 202591 flights82.4%
Jan–Mar 202690 flights75.3%
Apr–Jun 202691 flights78.9%

Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1615 did best on Wednesday at 82.7% on time and worst on Sunday at 63.5%. Each day rests on about 52 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1615 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 5,172 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.

Late-arriving aircraft
52%
Carrier
24%
National Airspace System
20%
Extreme weather
4%

52% 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 5,172 reported delay minutes here, that single category outweighs weather by 14 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 5,172 delay minutes reported on UA 1615.

Cancellations are rare at 0.55%, 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

7.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on two other city pairs in the data, including PHX to DEN (41) 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. 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 1615

For a booking, read UA 1615 as 72.7% on time with 0.55% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures