Carrier route record

UACLT→IAH

United Airlines · Charlotte to Houston

Flights: 394
Period: July 2025 to June 2026
Share of route: 17%
Carriers: 4

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

United on CLT to IAH earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 394 flights, with a median arrival 11 minutes early.

Set against the rest of the country, United's CLT to IAH record is 8 points better than the US average of 77.6%. That gap is worth roughly 82 fewer late arrivals for every thousand flights.

On time

85.8%

Arrivals under 15 minutes late, of 387 completed flights

Avg delay

95 min

Across delayed arrivals only, not all flights

Cancelled

1.78%

National rate is 1.81%

Whole route

77.6%

Every carrier on CLT to IAH, 2,348 flights

These figures cover 394 flights between July 2025 and June 2026. The median arrival is 11 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.

Carrier by carrier

United against every carrier on CLT to IAH

United flew 394 of the 2,348 flights on CLT to IAH, about 17% of it. Its 85.8% on time is 8 points better than the route as a whole, which runs 77.6%. Ranked by on-time rate it is first of four carriers on the route, where the range runs from United at 85.8% to SkyWest at 74.3%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on CLT to IAH
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines (this page)	394	85.8%	95 min	1.78%	A
American Airlines	1,623	76.1%	73 min	1.60%	B
Frontier Airlinesthin sample	216	75.6%	62 min	5.09%	B−
SkyWest Airlinesthin sample	115	74.3%	67 min	1.74%	C

Flight by flight

United flight numbers on CLT to IAH

UA 57507:0089.1% · 364 flights

Departure window

When United runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 394 flights.

There are not enough flights in each departure window to split United's CLT to IAH record by time of day without the percentages moving on noise. The headline rate of 85.8% is the reliable figure here.

Across the year

United on CLT to IAH through the year

Darker means more delays. Figures are on-time percentages.October best, July worst

July is the worst month at 64.8% on time, 32 points below October, the best at 96.8%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 57 flights.

Across the week, Thursday is the strongest day at 91.1% on time and Friday the weakest at 75.0%. 16 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. Carrier accounts for 64% of the 5,203 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.

Carrier
64%
National Airspace System
29%
Late-arriving aircraft
6%

The largest share of delay minutes, 64%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,353 of the 5,203 delay minutes reported here. The split is drawn from 5,203 reported delay minutes.

Cancellations sit at 1.78% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

5.9% 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 an hour and a half, which a normal layover absorbs.

The 912 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 is a different operation and performs like one: it runs 74.7% on time across 394 flights, 11 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 11 points of difference.

One caution: this is a thin sample. 394 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 IAH

Put together: treat all of this as provisional. 394 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 85.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 387 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