Flight number record

DL 1536

Delta Air Lines · St. Louis to Atlanta

Route: STL → ATL
Departs: 07:05
Flights: 267
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 18 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 267 flights, with a median arrival 16 minutes early.

Set against the rest of the country, DL 1536's record is 18 points better than the US average of 77.6%. That gap is worth roughly 182 fewer late arrivals for every thousand flights.

On time

95.8%

Arrivals under 15 minutes late, of 264 completed flights

Avg delay

105 min

Across delayed arrivals only, not all flights

Cancelled

1.12%

National rate is 1.81%

1 hour+ late

2.7%

National rate is 8.1%

These figures cover 267 flights between July 2025 and June 2026. The median arrival is 16 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 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 (88 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:05104 flights39.0%
Departs 07:0088 flights33.0%

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 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 95.8%. 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 1536 next to STL to ATL

Every carrier on STL to ATL combined arrived on time 85.3% of the time across 3,705 flights, so DL 1536 is 11 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 89.4% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 14 points.

DL 1536 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1536thin sample	267	95.8%	105 min	1.12%	A
All Delta Air Lines on STL–ATL	2,371	89.4%	77 min	1.98%	A
All carriers on STL–ATL	3,705	85.3%	72 min	1.73%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1536 quarter by quarter

Quarter by quarter DL 1536 held fairly steady: 97.8% in Jul–Sep 2025, 94.4% in Oct–Dec 2025 and 94.9% in Apr–Jun 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights97.8%
Oct–Dec 202592 flights94.4%
Jan–Mar 20264 flights—
Apr–Jun 202679 flights94.9%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1536 ranged from 89.2% on Monday to 100.0% on Wednesday. With about 38 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1536 runs late

One category carries most of the weight here. Carrier accounts for 64% of the 1,158 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
64%
Extreme weather
24%
National Airspace System
12%

Extreme weather accounts for 24% 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 3.9 times the usual weather exposure. The split is drawn from 1,158 delay minutes reported on DL 1536.

Cancellations sit at 1.12% against a national 1.81%, 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 2.7% 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.

The same number turns up on three other city pairs in the data, including MSP to BIS (62), PSP to MSP (36) and MSP to PSP (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, DL 1536 has one of the better records a US domestic flight can show: 95.8% on time and 1.12% cancelled. That is a base rate, not a promise about any single day.

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