Flight number record
UA 652
United Airlines · Denver to St. Louis
- Route
- DEN → STL
- Departs
- 09:35
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 652, check with United Airlines.
UA 652 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 45 minutes. That rests on 344 flights, with a median arrival 8 minutes early.
Set against the rest of the country, UA 652's record is 8 points better than the US average of 77.3%. That gap is worth roughly 83 fewer late arrivals for every thousand flights.
Key figures
On time
85.6%
Arrivals under 15 minutes late, of 341 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.89%
1 hour+ late
3.2%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. The median arrival is 8 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.
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Schedule
When UA 652 flies
UA 652 flies DEN to STL without a single fixed slot. Its most common scheduled departure was 09:35, used on 156 of 344 flights, with 10:10 (57 flights) and 09:40 (55 flights) next.
- Departs 09:35156 flights45.3%
- Departs 10:1057 flights16.6%
- Departs 09:4055 flights16.0%
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 09:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 652 runs level with that at 85.6%. 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 652 next to DEN to STL
Every carrier on DEN to STL combined arrived on time 77.7% of the time across 3,699 flights, so UA 652 is 8 points ahead of it. United flew 1,116 flights on the same city pair under all its flight numbers, including this one, and those ran 78.0% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 652thin sample | 344 | 85.6% | 46 min | 0.58% | A+ |
| All United Airlines on DEN–STL | 1,116 | 78.0% | 67 min | 0.36% | B+ |
| All carriers on DEN–STL | 3,699 | 77.7% | 61 min | 0.49% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 652 quarter by quarter
Quarter by quarter UA 652 held fairly steady: 83.3% in Jul–Sep 2025, 84.8% in Oct–Dec 2025, 86.5% in Jan–Mar 2026, 86.8% in Apr–Jun 2026 and 85.5% in Jul–Sep 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202592 flights84.8%
- Jan–Mar 202690 flights86.5%
- Apr–Jun 202670 flights86.8%
- Jul–Sep 202662 flights85.5%
Scale runs 75% to 90%.
By weekday, UA 652 did best on Tuesday at 91.8% on time and worst on Monday at 79.6%. 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 652 runs when it is late
Most of the lateness is short. 25 of the 49 late arrivals were under half an hour behind, and 11 reached an hour or more.
- 15+ min early73 flights21.4%
- Within 15 min219 flights64.2%
- 15–29 min late25 flights7.3%
- 30–59 min late13 flights3.8%
- 1–2 hours late9 flights2.6%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 341 completed flights by arrival against schedule.
8 of 42 late departures made up the time and arrived on time, 19% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for UA 652
The latest arrival of the period was on 6 March 2026, 3 hours 49 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 |
|---|---|---|
| 6 March 2026 | 3 hours 49 minutes | Carrier |
| 25 July 2026 | 2 hours 56 minutes | Late-arriving aircraft |
| 24 November 2025 | 1 hour 53 minutes | Carrier |
| 10 March 2026 | 1 hour 35 minutes | Late-arriving aircraft |
| 11 August 2026 | 1 hour 31 minutes | Carrier |
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 2,248 reported delay minutes.
- 39%Carrier
- 36%Late-arriving aircraft
- 25%National Airspace System
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,248 reported delay minutes here, that single category outweighs weather by 36 to one. The split is drawn from 2,248 delay minutes reported on UA 652.
Cancellations are rare at 0.58%, 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 3.2% 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 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.
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, UA 652 has one of the better records a US domestic flight can show: 85.6% on time and 0.58% cancelled. That is a base rate, not a promise about any single 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 route69.0%
- Frontier Airlines 3302 on the same route82.5%
- 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
- 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.