Flight number record
UA 1315
United Airlines · Denver to St. Louis
- Route
- DEN → STL
- Departs
- 13:25
- Flights
- 258
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1315, check with United Airlines.
UA 1315 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 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 258 flights, with a median arrival 10 minutes early.
Set against the rest of the country, UA 1315's record is 9 points better than the US average of 77.6%. That gap is worth roughly 92 fewer late arrivals for every thousand flights.
Key figures
On time
86.8%
Arrivals under 15 minutes late, of 257 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
6.2%
National rate is 8.1%
These figures cover 258 flights between July 2025 and June 2026. The median arrival is 10 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 1315 flies
UA 1315 flies DEN to STL without a single fixed slot. Its most common scheduled departure was 13:25, used on 131 of 258 flights, with 13:26 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 13:25131 flights50.8%
- Departs 13:2637 flights14.3%
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 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1315 runs 8 points better at 86.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1315 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 1315 is 9 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 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1315thin sample | 258 | 86.8% | 59 min | 0.00% | A+ |
| 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 1315 quarter by quarter
UA 1315 did not run the same all year. Its best quarter was Oct–Dec 2025 at 93.4% on time and its weakest Jan–Mar 2026 at 79.6%, a swing of 14 points on roughly 65 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 flights87.9%
- Oct–Dec 202576 flights93.4%
- Jan–Mar 202654 flights79.6%
- Apr–Jun 202636 flights80.6%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1315 did best on Thursday at 90.5% on time and worst on Monday at 78.4%. Each day rests on about 37 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1315 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 51% of the 2,006 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.
- 51%Late-arriving aircraft
- 22%National Airspace System
- 21%Carrier
- 6%Extreme weather
51% 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 2,006 reported delay minutes here, that single category outweighs weather by 9 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 2,006 delay minutes reported on UA 1315.
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
6.2% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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 four other city pairs in the data, including LAS to DEN (41), SFO to DEN (21) and SYR to DEN (19), but none flew often enough under UA 1315 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. 258 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 1315
For a booking, UA 1315 has one of the better records a US domestic flight can show: 86.8% on time and 0.00% 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 652 on the same route83.3%
- United Airlines 1422 on the same route70.2%
- Frontier Airlines 3302 on the same route85.9%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.