Flight number record
DL 1393
Delta Air Lines · Atlanta to St. Louis
- Route
- ATL → STL
- Departs
- 17:16
- Flights
- 302
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1393, check with Delta Air Lines.
DL 1393 lands a B−, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 302 flights, with a median arrival 5 minutes early.
Key figures
On time
78.7%
Arrivals under 15 minutes late, of 291 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
3.64%
National rate is 1.89%
1 hour+ late
9.3%
National rate is 8.3%
These figures cover 302 flights between September 2025 and August 2026. Beyond the headline rate, 9.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1393 flies
DL 1393 flies ATL to STL without a single fixed slot. Its most common scheduled departure was 17:16, used on 58 of 302 flights, with 17:10 (40 flights) next.
- Departs 17:1658 flights19.2%
- Departs 17:1040 flights13.2%
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 17:16 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1393 runs 11 points better at 78.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 1393 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 1393 is 3 points behind 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 trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1393thin sample | 302 | 78.7% | 73 min | 3.64% | B− |
| 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 1393 quarter by quarter
DL 1393 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.2% on time and its weakest Jul–Sep 2026 at 60.3%, a swing of 28 points on roughly 76 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 202512 flights—
- Oct–Dec 202587 flights82.1%
- Jan–Mar 202656 flights75.0%
- Apr–Jun 202689 flights88.2%
- Jul–Sep 202658 flights60.3%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1393 did best on Wednesday at 88.9% on time and worst on Sunday at 71.1%. Each day rests on about 43 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1393 runs when it is late
The 62 late arrivals split 19 under half an hour, 16 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early35 flights12.0%
- Within 15 min194 flights66.7%
- 15–29 min late19 flights6.5%
- 30–59 min late16 flights5.5%
- 1–2 hours late15 flights5.2%
- 2+ hours late12 flights4.1%
Scale runs 0% to 100%.
Share of 291 completed flights by arrival against schedule.
8 of 62 late departures made up the time and arrived on time, 13% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for DL 1393
The latest arrival of the period was on 11 July 2026, 6 hours 14 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 July 2026 | 6 hours 14 minutes | Late-arriving aircraft |
| 25 July 2026 | 4 hours 55 minutes | Extreme weather |
| 20 December 2025 | 3 hours 34 minutes | Carrier |
| 3 July 2026 | 3 hours 17 minutes | Carrier |
| 18 June 2026 | 2 hours 52 minutes | Carrier |
Delay causes
Why DL 1393 runs late
Carrier accounts for 53% of the 4,516 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Carrier
- 23%Late-arriving aircraft
- 14%Extreme weather
- 10%National Airspace System
Extreme weather accounts for 14% 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 2.4 times the usual weather exposure. The split is drawn from 4,516 delay minutes reported on DL 1393.
Cancellations run at 3.64%, against 1.89% nationally. That is roughly one flight in 25 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
9.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on one other city pair in the data, including STL to ATL (230), but none flew often enough under DL 1393 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to STL only.
One caution: this is a thin sample. 302 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 1393
For a booking, the cancellation rate is the figure to plan around on DL 1393: 3.64% of its 302 scheduled flights did not operate. A late arrival costs a little over an hour, 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 1571 on the same route91.8%
- 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.