Flight number record
DL 512
Delta Air Lines · Atlanta to Dallas
- Route
- ATL → DAL
- Departs
- 13:59
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 512, check with Delta Air Lines.
DL 512 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 365 flights, with a median arrival 9 minutes early.
Set against the rest of the country, DL 512's record is 7 points better than the US average of 77.3%. That gap is worth roughly 70 fewer late arrivals for every thousand flights.
Key figures
On time
84.3%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
5.3%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 9 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.
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Schedule
When DL 512 flies
DL 512 flies ATL to DAL without a single fixed slot. Its most common scheduled departure was 13:59, used on 98 of 365 flights, with 13:56 (64 flights) next.
- Departs 13:5998 flights26.8%
- Departs 13:5664 flights17.5%
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 13:59 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 512 runs 6 points better at 84.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 512 next to ATL to DAL
Every carrier on ATL to DAL combined arrived on time 80.4% of the time across 3,297 flights, so DL 512 is 4 points ahead of it. Delta flew 1,799 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 512 | 365 | 84.3% | 52 min | 1.10% | B |
| All Delta Air Lines on ATL–DAL | 1,799 | 83.6% | 65 min | 2.00% | B |
| All carriers on ATL–DAL | 3,297 | 80.4% | 61 min | 1.85% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 512 quarter by quarter
Quarter by quarter DL 512 held fairly steady: 87.9% in Oct–Dec 2025, 81.6% in Jan–Mar 2026, 85.1% in Apr–Jun 2026 and 82.3% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights—
- Oct–Dec 202592 flights87.9%
- Jan–Mar 202690 flights81.6%
- Apr–Jun 202691 flights85.1%
- Jul–Sep 202662 flights82.3%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 512 ranged from 78.0% on Friday to 88.5% on Wednesday. With about 52 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.
Arrival by arrival
How late DL 512 runs when it is late
DL 512 often beats the schedule: 105 of 356 completed flights, 29%, arrived 15 minutes or more early. The 56 late arrivals split 14 under half an hour, 23 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early105 flights29.5%
- Within 15 min195 flights54.8%
- 15–29 min late14 flights3.9%
- 30–59 min late23 flights6.5%
- 1–2 hours late17 flights4.8%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
18 of 64 late departures made up the time and arrived on time, 28% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for DL 512
The latest arrival of the period was on 4 August 2026, 2 hours 38 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 August 2026 | 2 hours 38 minutes | Carrier |
| 6 March 2026 | 2 hours | Carrier |
| 3 September 2025 | 1 hour 59 minutes | Carrier |
| 20 April 2026 | 1 hour 56 minutes | Carrier |
| 9 August 2026 | 1 hour 34 minutes | Carrier |
Delay causes
Why DL 512 runs late
Carrier accounts for 63% of the 2,903 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 19%National Airspace System
- 16%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,817 of the 2,903 delay minutes reported here. The split is drawn from 2,903 delay minutes reported on DL 512.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 1.37%.
Connections and routes
What a delay on this flight costs
5.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, which a normal layover absorbs.
The 721 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.
DL 512 is not only a ATL to DAL flight. It also flew DAL to ATL (362 flights, 69.7% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 365 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DAL to ATLthin sample | 362 | 69.7% | 78 min | 1.10% | C |
What to do with this
Booking DL 512
For a booking, read DL 512 as 84.3% on time with 1.10% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to DAL, every carrier and departure
- DAL to ATL, the return direction
- Delta Air Lines 2780 on the same route76.5%
- Delta Air Lines 1104 on the same route81.2%
- Delta Air Lines 1115 on the same route90.2%
- Delta Air Lines 441 on the same route90.2%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Dallas Love Field (DAL) 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
- Worst months to fly in the US, ranked by the data
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.