Flight number record

UA 1813

United Airlines · Cincinnati to Chicago

Route: CVG → ORD
Departs: 17:51
Flights: 256
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1813, check with United Airlines.

UA 1813 earns an F, which is as low as this site's scale goes for a reason. Only 44.4% of flights arrive inside the 15-minute window, 33 points worse than the national rate of 77.6%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 256 flights, with a median arrival 19 minutes late.

The national on-time rate over the same period is 77.6%, so UA 1813 runs 33 points behind the country as a whole. Across a thousand flights that is about 332 extra late arrivals.

On time

44.4%

Arrivals under 15 minutes late, of 250 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

2.34%

National rate is 1.81%

1 hour+ late

19.6%

National rate is 8.1%

These figures cover 256 flights between July 2025 and June 2026. Beyond the headline rate, 19.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When UA 1813 flies

UA 1813 flies CVG to ORD without a single fixed slot. Its most common scheduled departure was 17:51, used on 41 of 256 flights, with 17:55 (37 flights) and 18:12 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:5141 flights16.0%
Departs 17:5537 flights14.5%
Departs 18:1237 flights14.5%

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 17:51 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1813 runs 24 points worse at 44.4%. 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 1813 next to CVG to ORD

Every carrier on CVG to ORD combined arrived on time 70.2% of the time across 4,630 flights, so UA 1813 is 26 points behind it. United flew 946 flights on the same city pair under all its flight numbers, including this one, and those ran 68.5% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 35 points.

UA 1813 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1813thin sample	256	44.4%	80 min	2.34%	F
All United Airlines on CVG–ORD	946	68.5%	74 min	2.43%	C
All carriers on CVG–ORD	4,630	70.2%	86 min	3.43%	C−
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1813 quarter by quarter

UA 1813 did not run the same all year. Its best quarter was Jul–Sep 2025 at 55.1% on time and its weakest Oct–Dec 2025 at 30.4%, a swing of 25 points on roughly 64 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 202591 flights55.1%
Oct–Dec 202569 flights30.4%
Jan–Mar 202637 flights33.3%
Apr–Jun 202659 flights51.8%

Scale runs 20% to 60%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1813 did best on Thursday at 54.3% on time and worst on Wednesday at 35.9%. Each day rests on about 37 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1813 runs late

One category carries most of the weight here. National Airspace System accounts for 54% of the 11,000 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.

National Airspace System
54%
Late-arriving aircraft
29%
Extreme weather
9%
Carrier
8%

54% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 6,046 minutes out of 11,000, against a national NAS share of 21%. The split is drawn from 11,168 delay minutes reported on UA 1813.

Cancellations sit at 2.34% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 19.6% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The same number turns up on five other city pairs in the data, including PBI to IAD (45), ORD to AUS (32) and IAD to PSP (19), but none flew often enough under UA 1813 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to CVG to ORD only.

One caution: this is a thin sample. 256 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 1813

For a booking, UA 1813 is a flight to put a long connection behind. 19.6% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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