Flight number record

DL 1571

Delta Air Lines · Atlanta to St. Louis

Route: ATL → STL
Departs: 08:05
Flights: 319
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 14 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 319 flights, with a median arrival 10 minutes early.

Set against the rest of the country, DL 1571's record is 14 points better than the US average of 77.6%. That gap is worth roughly 140 fewer late arrivals for every thousand flights.

On time

91.6%

Arrivals under 15 minutes late, of 310 completed flights

Avg delay

48 min

Across delayed arrivals only, not all flights

Cancelled

2.82%

National rate is 1.81%

1 hour+ late

2.3%

National rate is 8.1%

These figures cover 319 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 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 319 flights, with 07:35 (51 flights) and 07:45 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:0553 flights16.6%
Departs 07:3551 flights16.0%
Departs 07:4547 flights14.7%

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 08:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1571 runs 8 points better at 91.6%. 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

DL 1571 next to ATL to STL

Every carrier on ATL to STL combined arrived on time 82.4% of the time across 3,706 flights, so DL 1571 is 9 points ahead of it. Delta flew 2,371 flights on the same city pair under all its flight numbers, including this one, and those ran 84.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 10 points.

DL 1571 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1571thin sample	319	91.6%	48 min	2.82%	A
All Delta Air Lines on ATL–STL	2,371	84.7%	55 min	1.98%	B
All carriers on ATL–STL	3,706	82.4%	56 min	1.54%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1571 quarter by quarter

Quarter by quarter DL 1571 held fairly steady: 95.9% in Jul–Sep 2025, 88.1% in Oct–Dec 2025, 90.7% in Jan–Mar 2026 and 91.6% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202574 flights95.9%
Oct–Dec 202570 flights88.1%
Jan–Mar 202690 flights90.7%
Apr–Jun 202685 flights91.6%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1571 ranged from 87.0% on Sunday to 95.6% on Thursday. With about 46 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.

Delay causes

Why DL 1571 runs late

One category carries most of the weight here. Carrier accounts for 63% of the 1,251 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.

Carrier
63%
National Airspace System
27%
Late-arriving aircraft
10%

The largest share of delay minutes, 63%, 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 793 of the 1,251 delay minutes reported here. The split is drawn from 1,251 delay minutes reported on DL 1571.

Cancellations run at 2.82%, against 1.81% nationally. That is roughly one flight in 40 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 8.1% 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.

DL 1571 is not only a ATL to STL flight. It also flew STL to ATL (315 flights, 93.8% 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. 319 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.

Other routes flown as DL 1571
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
STL to ATLthin sample	315	93.8%	79 min	2.86%	A

What to do with this

Booking DL 1571

For a booking, the cancellation rate is the figure to plan around on DL 1571: 2.82% of its 319 scheduled flights did not operate. A late arrival costs roughly 50 minutes, but a cancellation costs the day, so leave a later option open.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures