Carrier route record
UADEN→CLT
United Airlines · Denver to Charlotte
- Flights
- 675
- Period
- July 2025 to June 2026
- Share of route
- 24%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on DEN to CLT lands a B+, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 675 flights, with a median arrival 4 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate United on DEN to CLT from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.6%
Arrivals under 15 minutes late, of 670 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
0.59%
National rate is 1.81%
Whole route
82.4%
Every carrier on DEN to CLT, 2,813 flights
These figures cover 675 flights between July 2025 and June 2026. Beyond the headline rate, 8.2% 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 DEN to CLT
United flew 675 of the 2,813 flights on DEN to CLT, about 24% of it. Its 77.6% on time is 5 points worse than the route as a whole, which runs 82.4%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Frontier at 86.7% to Southwest at 70.1%. Three 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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 214 | 86.7% | 54 min | 1.40% | A |
| American Airlines | 1,715 | 85.1% | 76 min | 1.40% | A |
| SkyWest Airlinesthin sample | 20 | 80.0% | 44 min | 0.00% | B+ |
| United Airlines (this page) | 675 | 77.6% | 66 min | 0.59% | B+ |
| Southwest Airlinesthin sample | 189 | 70.1% | 43 min | 2.65% | C |
Flight by flight
United flight numbers on DEN to CLT
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 16 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am310 flights86.4%
- 11am–2pm1 flights—
- 2pm–5pm5 flights—
- 5pm–8pm359 flights70.2%
- 8pm–5am—
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 86.4% of the time, against 70.2% for the evening window. That is 16 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 359 flights scheduled in it.
Across the year
United on DEN to CLT through the year
July is the worst month at 59.0% on time, 34 points below April, the best at 93.3%. 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. May was the busiest month here, with 62 flights.
Across the week, Sunday is the strongest day at 84.4% on time and Saturday the weakest at 67.9%. 17 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. Late-arriving aircraft accounts for 53% of the 9,947 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.
- 53%Late-arriving aircraft
- 24%Carrier
- 22%National Airspace System
- 1%Extreme weather
53% 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 9,947 reported delay minutes here, that single category outweighs weather by 53 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 9,947 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 86.4% on time here.
Cancellations are rare at 0.59%, 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 stage length
What a delay here costs
8.2% 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 about an hour, which a normal layover absorbs.
The 1,337 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 85.1% on time across 675 flights, 8 points above 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 8 points of difference.
One caution: this is a thin sample. 675 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 DEN to CLT
Put together: treat all of this as provisional. 675 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 77.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 670 completed flights over 12 months sit behind that.
Related
Where to go next
- DEN to CLT, every carrier
- United on CLT to DEN, the return leg
- Frontier Airlines on DEN to CLT86.7%
- American Airlines on DEN to CLT85.1%
- Southwest Airlines on DEN to CLT70.1%
- United Airlines network-wide record
- Denver International (DEN) delay statistics
- Charlotte Douglas International (CLT) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
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.