Flight number record

DL 1001

Delta Air Lines · Atlanta to Jacksonville

Route: ATL → JAX
Departs: 21:35
Flights: 307
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1001, check with Delta Air Lines.

DL 1001 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 307 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so DL 1001 runs 10 points behind the country as a whole. Across a thousand flights that is about 97 extra late arrivals.

On time

67.9%

Arrivals under 15 minutes late, of 305 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

0.65%

National rate is 1.81%

1 hour+ late

11.1%

National rate is 8.1%

These figures cover 307 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 1001 flies

DL 1001 flies ATL to JAX without a single fixed slot. Its most common scheduled departure was 21:35, used on 41 of 307 flights, with 21:50 (37 flights) and 21:45 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:3541 flights13.4%
Departs 21:5037 flights12.1%
Departs 21:4536 flights11.7%

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 21:35 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 1001 runs 3 points worse at 67.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1001 next to ATL to JAX

Every carrier on ATL to JAX combined arrived on time 75.5% of the time across 4,017 flights, so DL 1001 is 8 points behind it. Delta flew 3,829 flights on the same city pair under all its flight numbers, including this one, and those ran 76.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 14 points.

DL 1001 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1001thin sample	307	67.9%	62 min	0.65%	C+
All Delta Air Lines on ATL–JAX	3,829	76.3%	57 min	1.44%	B
All carriers on ATL–JAX	4,017	75.5%	57 min	1.42%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 Apr–Jun 2026 at 56.2%, a swing of 20 points on roughly 77 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 202588 flights64.8%
Oct–Dec 202588 flights75.9%
Jan–Mar 202667 flights72.7%
Apr–Jun 202664 flights56.2%

Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1001 did best on Wednesday at 79.4% on time and worst on Friday at 61.5%. Each day rests on about 44 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1001 runs late

One category carries most of the weight here. Carrier accounts for 47% of the 6,023 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
47%
Late-arriving aircraft
27%
National Airspace System
13%
Extreme weather
13%

Extreme weather accounts for 13% 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 2.1 times the usual weather exposure. The split is drawn from 6,023 delay minutes reported on DL 1001.

Cancellations are rare at 0.65%, below the national 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. 307 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: 8 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.

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