Flight number record
DL 1309
Delta Air Lines · Atlanta to Washington
- Route
- ATL → IAD
- Departs
- 19:51
- Flights
- 287
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1309, check with Delta Air Lines.
DL 1309 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 287 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so DL 1309 runs 5 points behind the country as a whole. Across a thousand flights that is about 47 extra late arrivals.
Key figures
On time
72.6%
Arrivals under 15 minutes late, of 281 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
2.09%
National rate is 1.89%
1 hour+ late
9.3%
National rate is 8.3%
These figures cover 287 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 1309 flies
DL 1309 flies ATL to IAD without a single fixed slot. Its most common scheduled departure was 19:51, used on 49 of 287 flights, with 19:07 (31 flights) and 19:15 (29 flights) next.
- Departs 19:5149 flights17.1%
- Departs 19:0731 flights10.8%
- Departs 19:1529 flights10.1%
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 19:51 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1309 runs 5 points better at 72.6%. 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 1309 next to ATL to IAD
Every carrier on ATL to IAD combined arrived on time 76.4% of the time across 4,005 flights, so DL 1309 is 4 points behind it. Delta flew 2,233 flights on the same city pair under all its flight numbers, including this one, and those ran 77.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1309thin sample | 287 | 72.6% | 67 min | 2.09% | C |
| All Delta Air Lines on ATL–IAD | 2,233 | 77.8% | 76 min | 2.73% | B |
| All carriers on ATL–IAD | 4,005 | 76.4% | 79 min | 2.12% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1309 quarter by quarter
DL 1309 did not run the same all year. Its best quarter was Oct–Dec 2025 at 83.8% on time and its weakest Jul–Sep 2026 at 54.2%, a swing of 30 points on roughly 72 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 202513 flights—
- Oct–Dec 202581 flights83.8%
- Jan–Mar 202668 flights80.0%
- Apr–Jun 202676 flights61.3%
- Jul–Sep 202649 flights54.2%
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1309 did best on Thursday at 82.0% on time and worst on Friday at 54.2%. Each day rests on about 41 flights, so a gap of 28 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1309 runs when it is late
The 77 late arrivals split 27 under half an hour, 24 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early27 flights9.6%
- Within 15 min177 flights63.0%
- 15–29 min late27 flights9.6%
- 30–59 min late24 flights8.5%
- 1–2 hours late11 flights3.9%
- 2+ hours late15 flights5.3%
Scale runs 0% to 100%.
Share of 281 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 67 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 15 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at IAD.
The worst days
Worst days for DL 1309
The latest arrival of the period was on 25 November 2025, 4 hours behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 November 2025 | 4 hours | Carrier |
| 6 July 2026 | 3 hours 53 minutes | Carrier |
| 12 June 2026 | 3 hours 37 minutes | Carrier |
| 5 July 2026 | 3 hours 27 minutes | Carrier |
| 28 April 2026 | 3 hours 18 minutes | Late-arriving aircraft |
Delay causes
Why DL 1309 runs late
Carrier accounts for 48% of the 5,144 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 26%National Airspace System
- 24%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,493 of the 5,144 delay minutes reported here. The split is drawn from 5,144 delay minutes reported on DL 1309.
Cancellations sit at 2.09% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
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 534 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on one other city pair in the data, including IAD to ATL (25), but none flew often enough under DL 1309 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to IAD only.
One caution: this is a thin sample. 287 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 1309
For a booking, read DL 1309 as 72.6% on time with 2.09% cancelled over 287 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to IAD, every carrier and departure
- IAD to ATL, the return direction
- United Airlines 1831 on the same route76.2%
- Delta Air Lines 1695 on the same route75.6%
- Delta Air Lines 2549 on the same route72.8%
- United Airlines 632 on the same route87.0%
- United Airlines 2634 on the same route76.6%
- Delta Air Lines 1444 on the same route87.6%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Washington Dulles International (IAD) 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
- The best time of day to fly, according to 7.05 million flight records
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.