Carrier route record

UACLT→ORD

United Airlines · Charlotte to Chicago

Flights: 611
Period: July 2025 to June 2026
Share of route: 14%
Carriers: 5

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

United on CLT to ORD sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 611 flights. The strongest carrier on the route with a full sample, Republic Airways, flew 372 at 83.6% on time.

The national on-time rate over the same period is 77.6%, so United on CLT to ORD runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.

On time

71.1%

Arrivals under 15 minutes late, of 596 completed flights

Avg delay

87 min

Across delayed arrivals only, not all flights

Cancelled

2.13%

National rate is 1.81%

Whole route

72.2%

Every carrier on CLT to ORD, 4,300 flights

These figures cover 611 flights between July 2025 and June 2026. Beyond the headline rate, 11.9% 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.

Carrier by carrier

United against every carrier on CLT to ORD

United flew 611 of the 4,300 flights on CLT to ORD, about 14% of it. Its 71.1% on time is about level with the route as a whole at 72.2%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from Republic at 83.6% to Frontier at 62.4%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. Republic Airways arrives on time 83.6% of the time; American Airlines manages 71.0%. Sample sizes sit next to every figure, because a two-point gap across 3,000 flights means less than a ten-point one.

On-time performance by carrier on CLT to ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
Republic Airways	372	83.6%	80 min	2.96%	B
SkyWest Airlinesthin sample	160	81.6%	128 min	5.00%	B−
United Airlines (this page)	611	71.1%	87 min	2.13%	C
American Airlines	3,000	71.0%	72 min	2.87%	C
Frontier Airlinesthin sample	157	62.4%	122 min	4.46%	D−

The spread between Republic and American is 13 points, wide enough that it should decide the booking. On a hundred trips that is 13 more arrivals inside the on-time window.

Departure window

When United runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 38 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am152 flights90.0%
8am–11am116 flights89.3%
11am–2pm50 flights83.3%
2pm–5pm—
5pm–8pm293 flights52.1%
8pm–5am—

Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 52.1% on time, against 90.0% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 293 flights scheduled in it.

Across the year

United on CLT to ORD through the year

Jul–Sep 2025269 flights83.2%
Oct–Dec 2025136 flights64.2%
Jan–Mar 202682 flights47.5%
Apr–Jun 2026124 flights68.3%

Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 71.1% on time across 611 flights.

United on CLT to ORD did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.2% on time and its weakest Jan–Mar 2026 at 47.5%, a swing of 36 points on roughly 153 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.

Across the week, Saturday is the strongest day at 76.7% on time and Friday the weakest at 67.0%. 10 points is a smaller lever than departure hour, but it is free.

Delay causes

Why United runs late on this route

One category carries most of the weight here. National Airspace System accounts for 53% of the 15,000 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
53%
Late-arriving aircraft
29%
Carrier
16%
Extreme weather
1%

53% 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 8,003 minutes out of 15,000, against a national NAS share of 21%. The split is drawn from 15,035 reported delay minutes.

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.0% on time here.

Cancellations sit at 2.13% against a national 1.81%, which is ordinary. Diversions add another 0.33%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.9% 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 599 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 return leg runs 70.6% on time across 612 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 611 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 United on CLT to ORD

Put together: treat all of this as provisional. 611 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 71.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 596 completed flights over 12 months sit behind that.

Where to go next

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