Flight profile · Delta Air Lines
DL512
Atlanta (ATL) to Dallas (DAL) · scheduled 1:59 PM – 3:12 PM
How DL512 performs
623 operations, June 2024 – August 2026.
Between its first and last recorded date on ATL → DAL, DL512 averaged about 5 operations a week (623 in 816 days, cancelled ones included).
DL512 arrived on time 83.0% of the time, against 79.5% for all ATL → DAL flights, so this departure is 3.5 percentage points better than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 623 operations, June 2024 – August 2026 · If DL512 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL512 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL512 | 83.0% | 1.61% | -9 min | 5.6% | 623 |
| Delta Air Lines on ATL → DAL | 82.6% | 1.31% | -9 min | 6.0% | 5,792 |
| All ATL → DAL flights | 79.5% | 1.24% | -6 min | 6.4% | 11,011 |
DL512 cancelled 10 of 623 operations (1.61%), close to the 1.24% for ATL → DAL.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – August 2026
Why DL512 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL512 on ATL → DAL. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies DL512 comes in late, and what that does to the departure.
The aircraft flying DL512 came in 15 or more minutes late on 9% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Matched by tail number to the aircraft’s previous flight into ATL: 577 of 613 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| DL512 | 9% |
| Network, same turn | 18% |
51 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 45 to 59 minutes. How often DL512’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – August 2026
From pushback to gate
When it leaves ATL late, does that still matter by the time it reaches DAL?
DL512 pushes back an average of 7.4 minutes late and reaches the gate at DAL an average of 1.2 minutes late. The 6.2 minutes between those two figures are slack the published schedule already carries, so a late pushback is partly, not fully, made up before the gate. Its 14.1 minutes on the taxiways at ATL is about what any departure from the airport in that hour spends.
On arrival at DAL, DL512 spends 4.8 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at DAL spends on the ground before reaching the gate.
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 51,978 ATL departures. Taxi-in is landing to gate, set against 229,763 arrivals at DAL. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – August 2026
The hour it leaves ATL
DL512 has one departure time, 1:59 PM, so this is what that hour at ATL is worth.
On-time arrival rate. 51,978 departures from ATL are scheduled in the 1 PM–2 PM hour over the period, against 1,039,468 across the whole day.
DL512 is scheduled out of ATL at 1:59 PM, in the 1 PM–2 PM bank. Departures from ATL in that hour arrive on time 81.4% of the time against 78.6% across the airport’s whole day, so the hour DL512 leaves in is an ordinary one for ATL and explains nothing about its record either way.
Both airport figures cover every destination from ATL, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes DL512 has flown
Carriers reassign flight numbers. DL512 also served these 11 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DAL→ATL Dallas to Atlanta | June 7, 2024 – August 31, 2026 | 616 | 71.4% |
| BOS→MCO Boston to Orlando | April 14, 2025 – May 6, 2025 | 23 | — |
| FLL→DTW Fort Lauderdale to Detroit | March 9, 2025 – April 13, 2025 | 36 | — |
| SAT→DTW San Antonio to Detroit | October 7, 2024 – December 18, 2024 | 45 | — |
| MCI→LGA Kansas City to New York | November 16, 2024 – December 14, 2024 | 5 | — |
| BOS→ATL Boston to Atlanta | July 1, 2023 – June 6, 2024 | 221 | 72.6% |
| JFK→SFO New York to San Francisco | April 9, 2024 – May 6, 2024 | 28 | — |
| LGA→ATL New York to Atlanta | March 10, 2024 – April 8, 2024 | 26 | — |
| ATL→PVD Atlanta to Providence/Warwick | March 16, 2024 – April 6, 2024 | 4 | — |
| PVD→ATL Providence/Warwick to Atlanta | March 16, 2024 – April 6, 2024 | 4 | — |
| DEN→DTW Denver to Detroit | November 23, 2023 | 1 | — |
The figures above describe only ATL → DAL, the route DL512 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
37 min late
against a median of 9 min early
Percentiles over 623 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1115 | Delta Air Lines | 89.1% | 11 min early | 736 |
| DL512 this flight | Delta Air Lines | 83.0% | 9 min early | 623 |
| DL1104 | Delta Air Lines | 79.1% | 9 min early | 785 |
| DL2780 | Delta Air Lines | 77.9% | 7 min early | 892 |
Among all 4 departures on this route with at least 600 operations, DL512 has the 2nd highest on-time rate, 6.1 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 623 records of DL512 operating ATL → DAL, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule; cancelled and diverted flights are reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed