Flight number record
UA 235
United Airlines · Atlanta to Denver
- Route
- ATL → DEN
- Departs
- 16:35
- Flights
- 364
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 235, check with United Airlines.
UA 235 lands a B+, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 7 minutes early.
Key figures
On time
80.2%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
9.5%
National rate is 8.1%
These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 9.5% 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.
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 364 flights, with 16:16 (49 flights) and 16:37 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 16:3588 flights24.2%
- Departs 16:1649 flights13.5%
- Departs 16:3737 flights10.2%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
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 72.4%, and UA 235 runs 8 points better at 80.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 235 next to ATL to DEN
Every carrier on ATL to DEN combined arrived on time 77.6% of the time across 5,589 flights, so UA 235 is 3 points ahead of it. United flew 967 flights on the same city pair under all its flight numbers, including this one, and those ran 85.6% on time. Across its whole network United Airlines managed 79.0%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 235thin sample | 364 | 80.2% | 73 min | 0.00% | B+ |
| All United Airlines on ATL–DEN | 967 | 85.6% | 78 min | 0.41% | A+ |
| All carriers on ATL–DEN | 5,589 | 77.6% | 60 min | 1.02% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | 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 2025 at 69.3%, a swing of 20 points on roughly 91 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 202592 flights69.3%
- Oct–Dec 202591 flights81.3%
- Jan–Mar 202690 flights88.9%
- Apr–Jun 202691 flights81.1%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 235 did best on Tuesday at 86.8% on time and worst on Monday at 72.5%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 235 runs late
One category carries most of the weight here. National Airspace System accounts for 43% of the 5,156 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.
- 43%National Airspace System
- 34%Late-arriving aircraft
- 20%Carrier
- 3%Extreme weather
34% 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 5,156 reported delay minutes here, that single category outweighs weather by 13 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 5,156 delay minutes reported on UA 235.
Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.5% 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 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. 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 same number turns up on one other city pair in the data, including DEN to CLT (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. 364 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 80.2% on time with 0.00% cancelled over 364 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 route64.8%
- Frontier Airlines 3293 on the same route79.2%
- Delta Air Lines 746 on the same route66.3%
- Delta Air Lines 706 on the same route85.5%
- Delta Air Lines 530 on the same route81.6%
- Delta Air Lines 493 on the same route75.4%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.