Flight number record
UA 652
United Airlines · Denver to St. Louis
- Route
- DEN → STL
- Departs
- 09:40
- Flights
- 344
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 652, check with United Airlines.
UA 652 lands a B+, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 45 minutes on average. That is a workable record, not a spotless one. That rests on 344 flights, with a median arrival 7 minutes early.
Set against the rest of the country, UA 652's record is 6 points better than the US average of 77.6%. That gap is worth roughly 57 fewer late arrivals for every thousand flights.
Key figures
On time
83.3%
Arrivals under 15 minutes late, of 341 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.81%
1 hour+ late
3.2%
National rate is 8.1%
These figures cover 344 flights between July 2025 and June 2026. The median arrival is 7 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.
Schedule
When UA 652 flies
UA 652 flies DEN to STL without a single fixed slot. Its most common scheduled departure was 09:40, used on 117 of 344 flights, with 09:35 (94 flights) and 10:10 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 09:40117 flights34.0%
- Departs 09:3594 flights27.3%
- Departs 10:1057 flights16.6%
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 09:40 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 652 runs level with that at 83.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
UA 652 next to DEN to STL
Every carrier on DEN to STL combined arrived on time 78.1% of the time across 3,662 flights, so UA 652 is 5 points ahead of it. United flew 1,072 flights on the same city pair under all its flight numbers, including this one, and those ran 79.5% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 652thin sample | 344 | 83.3% | 45 min | 0.58% | B+ |
| All United Airlines on DEN–STL | 1,072 | 79.5% | 62 min | 0.28% | B+ |
| All carriers on DEN–STL | 3,662 | 78.1% | 58 min | 0.38% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 652 quarter by quarter
UA 652 did not run the same all year. Its best quarter was Apr–Jun 2026 at 86.8% on time and its weakest Jul–Sep 2025 at 76.1%, a swing of 11 points on roughly 86 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 flights76.1%
- Oct–Dec 202592 flights84.8%
- Jan–Mar 202690 flights86.5%
- Apr–Jun 202670 flights86.8%
Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, UA 652 did best on Tuesday at 94.0% on time and worst on Saturday at 72.9%. Each day rests on about 49 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 652 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,551 reported delay minutes.
- 42%Carrier
- 31%Late-arriving aircraft
- 27%National Airspace System
The largest share of delay minutes, 42%, 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 1,065 of the 2,551 delay minutes reported here. The split is drawn from 2,551 delay minutes reported on UA 652.
Cancellations are rare at 0.58%, 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 routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.2% land an hour or more behind schedule, against 8.1% 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 770 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 SAV (21), but none flew often enough under UA 652 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to STL 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 652
For a booking, read UA 652 as 83.3% on time with 0.58% cancelled over 344 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to STL, every carrier and departure
- STL to DEN, the return direction
- United Airlines 1422 on the same route70.2%
- Frontier Airlines 3302 on the same route85.9%
- United Airlines 1315 on the same route86.8%
- Denver International (DEN) delay statistics
- St. Louis Lambert International (STL) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.