Flight number record
DL 1536
Delta Air Lines · St. Louis to Atlanta
- Route
- STL → ATL
- Departs
- 07:05
- Flights
- 267
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1536, check with Delta Air Lines.
DL 1536 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 19 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 267 flights, with a median arrival 15 minutes early.
Set against the rest of the country, DL 1536's record is 19 points better than the US average of 77.3%. That gap is worth roughly 189 fewer late arrivals for every thousand flights.
Key figures
On time
96.2%
Arrivals under 15 minutes late, of 263 completed flights
Avg delay
102 min
Across delayed arrivals only, not all flights
Cancelled
1.50%
National rate is 1.89%
1 hour+ late
2.3%
National rate is 8.3%
These figures cover 267 flights between September 2025 and August 2026. The median arrival is 15 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 DL 1536 flies
DL 1536 flies STL to ATL without a single fixed slot. Its most common scheduled departure was 07:05, used on 104 of 267 flights, with 07:00 (55 flights) and 07:08 (43 flights) next.
- Departs 07:05104 flights39.0%
- Departs 07:0055 flights20.6%
- Departs 07:0843 flights16.1%
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 07:05 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1536 runs 7 points better at 96.2%. 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
DL 1536 next to STL to ATL
Every carrier on STL to ATL combined arrived on time 84.6% of the time across 3,673 flights, so DL 1536 is 12 points ahead of it. Delta flew 2,348 flights on the same city pair under all its flight numbers, including this one, and those ran 89.5% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1536thin sample | 267 | 96.2% | 102 min | 1.50% | A |
| All Delta Air Lines on STL–ATL | 2,348 | 89.5% | 77 min | 1.87% | A |
| All carriers on STL–ATL | 3,673 | 84.6% | 71 min | 1.63% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1536 quarter by quarter
Quarter by quarter DL 1536 held fairly steady: 100.0% in Jul–Sep 2025, 94.4% in Oct–Dec 2025, 94.9% in Apr–Jun 2026 and 98.4% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202592 flights94.4%
- Jan–Mar 20264 flights—
- Apr–Jun 202679 flights94.9%
- Jul–Sep 202662 flights98.4%
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1536 ranged from 91.9% on Monday to 100.0% on Wednesday. With about 38 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1536 runs when it is late
DL 1536 often beats the schedule: 139 of 263 completed flights, 53%, arrived 15 minutes or more early. When DL 1536 is late it tends to be very late: 6 of its 10 late arrivals were an hour or more behind, and 3 were two hours or more.
- 15+ min early139 flights52.9%
- Within 15 min114 flights43.3%
- 15–29 min late2 flights0.8%
- 30–59 min late2 flights0.8%
- 1–2 hours late3 flights1.1%
- 2+ hours late3 flights1.1%
Scale runs 0% to 100%.
Share of 263 completed flights by arrival against schedule.
Only 11 of 263 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for DL 1536
The latest arrival of the period was on 7 December 2025, 3 hours 30 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 3 hours 30 minutes | Extreme weather |
| 30 November 2025 | 3 hours 21 minutes | Carrier |
| 22 December 2025 | 3 hours 18 minutes | Carrier |
| 8 December 2025 | 1 hour 36 minutes | Carrier |
| 9 June 2026 | 1 hour 28 minutes | Carrier |
Delay causes
Why DL 1536 runs late
Carrier accounts for 62% of the 1,019 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Carrier
- 27%Extreme weather
- 11%National Airspace System
Extreme weather accounts for 27% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 4.5 times the usual weather exposure. The split is drawn from 1,019 delay minutes reported on DL 1536.
Cancellations sit at 1.50% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.3% 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 same number turns up on three other city pairs in the data, including MSP to BIS (62), MSP to PSP (36) and PSP to MSP (36), but none flew often enough under DL 1536 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to STL to ATL only.
One caution: this is a thin sample. 267 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 DL 1536
For a booking, read DL 1536 as 96.2% on time with 1.50% cancelled over 267 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- STL to ATL, every carrier and departure
- ATL to STL, the return direction
- Delta Air Lines 1524 on the same route94.4%
- Delta Air Lines 1571 on the same route93.7%
- St. Louis Lambert International (STL) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines 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 Delta Air Lines’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.