Flight number record
DL 1001
Delta Air Lines · Atlanta to Jacksonville
- Route
- ATL → JAX
- Departs
- 21:45
- Flights
- 284
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1001, check with Delta Air Lines.
DL 1001 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 284 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so DL 1001 runs 9 points behind the country as a whole. Across a thousand flights that is about 89 extra late arrivals.
Key figures
On time
68.4%
Arrivals under 15 minutes late, of 282 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.70%
National rate is 1.89%
1 hour+ late
10.3%
National rate is 8.3%
These figures cover 284 flights between September 2025 and August 2026. Beyond the headline rate, 10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1001 flies
DL 1001 flies ATL to JAX without a single fixed slot. Its most common scheduled departure was 21:45, used on 53 of 284 flights, with 21:50 (37 flights) and 21:55 (29 flights) next.
- Departs 21:4553 flights18.7%
- Departs 21:5037 flights13.0%
- Departs 21:5529 flights10.2%
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 21:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1001 runs level with that at 68.4%. 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 1001 next to ATL to JAX
Every carrier on ATL to JAX combined arrived on time 75.1% of the time across 4,076 flights, so DL 1001 is 7 points behind it. Delta flew 3,845 flights on the same city pair under all its flight numbers, including this one, and those ran 76.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1001thin sample | 284 | 68.4% | 59 min | 0.70% | C+ |
| All Delta Air Lines on ATL–JAX | 3,845 | 76.4% | 56 min | 1.59% | B |
| All carriers on ATL–JAX | 4,076 | 75.1% | 56 min | 1.59% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1001 quarter by quarter
DL 1001 did not run the same all year. Its best quarter was Oct–Dec 2025 at 75.9% on time and its weakest Jul–Sep 2026 at 47.4%, a swing of 29 points on roughly 71 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 202527 flights—
- Oct–Dec 202588 flights75.9%
- Jan–Mar 202667 flights72.7%
- Apr–Jun 202664 flights56.2%
- Jul–Sep 202638 flights47.4%
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1001 did best on Thursday at 74.0% on time and worst on Friday at 57.7%. Each day rests on about 41 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1001 runs when it is late
The 89 late arrivals split 22 under half an hour, 38 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early26 flights9.2%
- Within 15 min167 flights59.2%
- 15–29 min late22 flights7.8%
- 30–59 min late38 flights13.5%
- 1–2 hours late23 flights8.2%
- 2+ hours late6 flights2.1%
Scale runs 0% to 100%.
Share of 282 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 93 departures that left 15 minutes late or more, only 10 made it up before arrival. 6 flights left on time and still arrived late.
The worst days
Worst days for DL 1001
The latest arrival of the period was on 6 March 2026, 5 hours 51 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across March, June, July and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 March 2026 | 5 hours 51 minutes | Extreme weather |
| 14 June 2026 | 5 hours 9 minutes | National Airspace System |
| 19 July 2026 | 2 hours 38 minutes | Carrier |
| 15 March 2026 | 2 hours 18 minutes | Late-arriving aircraft |
| 6 August 2026 | 2 hours 9 minutes | Late-arriving aircraft |
Delay causes
Why DL 1001 runs late
Carrier accounts for 51% of the 5,243 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 25%Late-arriving aircraft
- 14%National Airspace System
- 10%Extreme weather
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,672 of the 5,243 delay minutes reported here. The split is drawn from 5,243 delay minutes reported on DL 1001.
Cancellations are rare at 0.70%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
10.3% 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 two other city pairs in the data, including ATL to AGS (11) and MSP to SEA (1), but none flew often enough under DL 1001 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to JAX only.
One caution: this is a thin sample. 284 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 1001
For a booking, DL 1001 is one of the weaker ways to fly ATL to JAX: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- ATL to JAX, every carrier and departure
- JAX to ATL, the return direction
- Delta Air Lines 2720 on the same route78.2%
- Delta Air Lines 2923 on the same route85.0%
- Delta Air Lines 2276 on the same route73.6%
- Delta Air Lines 2627 on the same route68.7%
- Delta Air Lines 2326 on the same route89.2%
- Delta Air Lines 3024 on the same route78.2%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Jacksonville International (JAX) 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
- How often a connection fails at the major US hubs
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.