Flight number record
DL 1571
Delta Air Lines · Atlanta to St. Louis
- Route
- ATL → STL
- Departs
- 08:05
- Flights
- 315
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1571, check with Delta Air Lines.
DL 1571 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 315 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 1571's record is 15 points better than the US average of 77.3%. That gap is worth roughly 145 fewer late arrivals for every thousand flights.
Key figures
On time
91.8%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
2.86%
National rate is 1.89%
1 hour+ late
2.3%
National rate is 8.3%
These figures cover 315 flights between September 2025 and August 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.
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Schedule
When DL 1571 flies
DL 1571 flies ATL to STL without a single fixed slot. Its most common scheduled departure was 08:05, used on 53 of 315 flights, with 07:35 (41 flights) next.
- Departs 08:0553 flights16.8%
- Departs 07:3541 flights13.0%
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 08:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1571 runs 8 points better at 91.8%. 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 1571 next to ATL to STL
Every carrier on ATL to STL combined arrived on time 81.8% of the time across 3,678 flights, so DL 1571 is 10 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 84.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1571thin sample | 315 | 91.8% | 50 min | 2.86% | A |
| All Delta Air Lines on ATL–STL | 2,348 | 84.6% | 56 min | 1.87% | B |
| All carriers on ATL–STL | 3,678 | 81.8% | 56 min | 1.41% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1571 quarter by quarter
Quarter by quarter DL 1571 held fairly steady: 88.1% in Oct–Dec 2025, 90.7% in Jan–Mar 2026, 91.6% in Apr–Jun 2026 and 98.0% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202521 flights—
- Oct–Dec 202570 flights88.1%
- Jan–Mar 202690 flights90.7%
- Apr–Jun 202685 flights91.6%
- Jul–Sep 202649 flights98.0%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1571 ranged from 87.2% on Sunday to 95.7% on Tuesday. With about 45 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1571 runs when it is late
DL 1571 often beats the schedule: 86 of 306 completed flights, 28%, arrived 15 minutes or more early. The 25 late arrivals split 9 under half an hour, 9 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early86 flights28.1%
- Within 15 min195 flights63.7%
- 15–29 min late9 flights2.9%
- 30–59 min late9 flights2.9%
- 1–2 hours late6 flights2.0%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 306 completed flights by arrival against schedule.
5 of 22 late departures made up the time and arrived on time, 23% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for DL 1571
The latest arrival of the period was on 16 March 2026, 2 hours 5 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 2 hours 5 minutes | Late-arriving aircraft |
| 7 December 2025 | 1 hour 58 minutes | National Airspace System |
| 17 March 2026 | 1 hour 47 minutes | Carrier |
| 10 January 2026 | 1 hour 41 minutes | Carrier |
| 22 December 2025 | 1 hour 21 minutes | Carrier |
Delay causes
Why DL 1571 runs late
Carrier accounts for 63% of the 1,256 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 27%National Airspace System
- 10%Late-arriving aircraft
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 792 of the 1,256 delay minutes reported here. The split is drawn from 1,256 delay minutes reported on DL 1571.
Cancellations run at 2.86%, against 1.89% nationally. That is roughly one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
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.
DL 1571 is not only a ATL to STL flight. It also flew STL to ATL (311 flights, 93.7% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 315 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| STL to ATLthin sample | 311 | 93.7% | 79 min | 2.89% | A |
What to do with this
Booking DL 1571
For a booking, the cancellation rate is the figure to plan around on DL 1571: 2.86% of its 315 scheduled flights did not operate. A late arrival costs about 50 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to STL, every carrier and departure
- STL to ATL, the return direction
- Delta Air Lines 1403 on the same route83.0%
- Delta Air Lines 1393 on the same route78.7%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- St. Louis Lambert International (STL) 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
- What a cancellation rate actually tells you (and what it hides)
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.