Flight number record
UA 1003
United Airlines · Denver to Charleston
- Route
- DEN → CHS
- Departs
- 09:45
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1003, check with United Airlines.
UA 1003 lands a B+, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That rests on 344 flights, with a median arrival 1 minute early.
Set against the rest of the country, UA 1003's record is 7 points better than the US average of 77.3%. That gap is worth roughly 66 fewer late arrivals for every thousand flights.
Key figures
On time
83.9%
Arrivals under 15 minutes late, of 342 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.29%
National rate is 1.89%
1 hour+ late
3.8%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When UA 1003 flies
UA 1003 flies DEN to CHS without a single fixed slot. Its most common scheduled departure was 09:45, used on 64 of 344 flights, with 09:50 (60 flights) and 09:48 (37 flights) next.
- Departs 09:4564 flights18.6%
- Departs 09:5060 flights17.4%
- Departs 09:4837 flights10.8%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 09:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1003 runs level with that at 83.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1003 next to DEN to CHS
Every carrier on DEN to CHS combined arrived on time 77.2% of the time across 662 flights, so UA 1003 is 7 points ahead of it. Across its whole network United Airlines managed 78.8%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1003thin sample | 344 | 83.9% | 49 min | 0.29% | B+ |
| All United Airlines on DEN–CHS | 450 | 81.4% | 49 min | 0.44% | B+ |
| All carriers on DEN–CHS | 662 | 77.2% | 46 min | 0.30% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1003 quarter by quarter
UA 1003 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Apr–Jun 2026 at 80.0%, a swing of 13 points on roughly 69 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 202530 flights93.3%
- Oct–Dec 202592 flights80.4%
- Jan–Mar 202690 flights88.8%
- Apr–Jun 202670 flights80.0%
- Jul–Sep 202662 flights82.0%
Scale runs 70% to 100%.
By weekday, UA 1003 did best on Thursday at 89.8% on time and worst on Sunday at 77.6%. Each day rests on about 49 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1003 runs when it is late
Most of the lateness is short. 28 of the 55 late arrivals were under half an hour behind, and 13 reached an hour or more.
- 15+ min early50 flights14.6%
- Within 15 min237 flights69.3%
- 15–29 min late28 flights8.2%
- 30–59 min late14 flights4.1%
- 1–2 hours late8 flights2.3%
- 2+ hours late5 flights1.5%
Scale runs 0% to 100%.
Share of 342 completed flights by arrival against schedule.
3 of 25 late departures made up the time and arrived on time, 12% of them. In the other direction, 33 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at CHS.
The worst days
Worst days for UA 1003
The latest arrival of the period was on 19 December 2025, 6 hours 6 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 6 hours 6 minutes | Carrier |
| 11 February 2026 | 2 hours 47 minutes | Carrier |
| 8 July 2026 | 2 hours 21 minutes | National Airspace System |
| 5 April 2026 | 2 hours 18 minutes | Late-arriving aircraft |
| 25 August 2026 | 2 hours 7 minutes | Carrier |
Delay causes
Why UA 1003 runs late
Carrier accounts for 44% of the 2,688 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 39%National Airspace System
- 17%Late-arriving aircraft
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,171 of the 2,688 delay minutes reported here. The split is drawn from 2,688 delay minutes reported on UA 1003.
Cancellations are rare at 0.29%, below the national 1.89% 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
Badly late arrivals are rare here: only 3.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,449 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.
The same number turns up on three other city pairs in the data, including MTJ to DEN (217), SBA to DEN (108) and DEN to JAX (20), but none flew often enough under UA 1003 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to CHS only.
One caution: this is a thin sample. 344 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 1003
For a booking, read UA 1003 as 83.9% on time with 0.29% cancelled over 344 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Denver International (DEN) delay statistics
- Charleston International (CHS) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.