Flight number record
UA 235
United Airlines · Atlanta to Denver
- Route
- ATL → DEN
- Departs
- 16:35
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 235, check with United Airlines.
UA 235 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 363 flights, with a median arrival 7 minutes early.
Key figures
On time
78.5%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
86 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
11.2%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 11.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 235 flies
UA 235 flies ATL to DEN without a single fixed slot. Its most common scheduled departure was 16:35, used on 88 of 363 flights, with 16:22 (70 flights) and 16:20 (37 flights) next.
- Departs 16:3588 flights24.2%
- Departs 16:2270 flights19.3%
- Departs 16:2037 flights10.2%
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 16:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 235 runs 7 points better at 78.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 235 next to ATL to DEN
Every carrier on ATL to DEN combined arrived on time 78.0% of the time across 5,594 flights, so UA 235 is about level with it. United flew 923 flights on the same city pair under all its flight numbers, including this one, and those ran 85.9% on time. Across its whole network United Airlines managed 78.8%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 235thin sample | 363 | 78.5% | 86 min | 0.28% | B+ |
| All United Airlines on ATL–DEN | 923 | 85.9% | 84 min | 0.43% | A+ |
| All carriers on ATL–DEN | 5,594 | 78.0% | 61 min | 1.11% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 235 quarter by quarter
UA 235 did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.9% on time and its weakest Jul–Sep 2026 at 56.1%, a swing of 33 points on roughly 73 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 flights73.3%
- Oct–Dec 202591 flights81.3%
- Jan–Mar 202690 flights88.9%
- Apr–Jun 202691 flights81.1%
- Jul–Sep 202661 flights56.1%
Scale runs 50% to 95%.
By weekday, UA 235 did best on Wednesday at 90.2% on time and worst on Saturday at 68.6%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 235 runs when it is late
UA 235 often beats the schedule: 109 of 358 completed flights, 30%, arrived 15 minutes or more early. When UA 235 is late it tends to be very late: 40 of its 77 late arrivals were an hour or more behind, and 18 were two hours or more.
- 15+ min early109 flights30.4%
- Within 15 min172 flights48.0%
- 15–29 min late15 flights4.2%
- 30–59 min late22 flights6.1%
- 1–2 hours late22 flights6.1%
- 2+ hours late18 flights5.0%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
10 of 73 late departures made up the time and arrived on time, 14% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for UA 235
The latest arrival of the period was on 3 July 2026, 6 hours 16 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 July 2026 | 6 hours 16 minutes | Late-arriving aircraft |
| 9 May 2026 | 5 hours 54 minutes | Late-arriving aircraft |
| 11 August 2026 | 4 hours 48 minutes | Late-arriving aircraft |
| 27 December 2025 | 3 hours 54 minutes | Carrier |
| 11 July 2026 | 3 hours 32 minutes | Late-arriving aircraft |
Delay causes
Why UA 235 runs late
Late-arriving aircraft accounts for 47% of the 6,592 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Late-arriving aircraft
- 35%National Airspace System
- 16%Carrier
- 2%Extreme weather
47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,592 reported delay minutes here, that single category outweighs weather by 31 to one. The split is drawn from 6,592 delay minutes reported on UA 235.
Cancellations are rare at 0.28%, 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
11.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,199 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 DEN to BZN (21), DEN to CLT (1) and DEN to ALB (1), but none flew often enough under UA 235 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to DEN only.
One caution: this is a thin sample. 363 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 235
For a booking, read UA 235 as 78.5% on time with 0.28% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to DEN, every carrier and departure
- DEN to ATL, the return direction
- Delta Air Lines 519 on the same route66.7%
- Delta Air Lines 746 on the same route67.8%
- Delta Air Lines 706 on the same route84.7%
- Frontier Airlines 3293 on the same route81.2%
- Delta Air Lines 530 on the same route80.5%
- United Airlines 340 on the same route91.1%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Denver International (DEN) 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
- Why the first flight of the morning is statistically safest
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.