Flight profile · Delta Air Lines
DL1211
Miami (MIA) to Atlanta (ATL) · scheduled 7:00 AM – 9:00 AM
How DL1211 performs
761 operations, June 2024 – July 2026.
DL1211 arrived on time 91.0% of the time, against 71.9% for all MIA → ATL flights, so this departure is 19.1 percentage points better than the route as a whole. Against Delta Air Lines’ own flights on this route it is 17.1 points better.
Source: US DOT Bureau of Transportation Statistics · 761 operations, June 2024 – July 2026 · If DL1211 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How DL1211 compares to other flight numbers, not just to itself.
This flight runs unusually far ahead of the MIA → ATL route as a whole, better than 100% of 11,788 comparable flight numbers.
91.0% on time for this specific departure, against 71.9% for every MIA → ATL flight.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where DL1211 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL1211 | 91.0% | 2.10% | -7 min | 3.1% | 761 |
| Delta Air Lines on MIA → ATL | 73.9% | 1.18% | -3 min | 10.1% | 9,995 |
| All MIA → ATL flights | 71.9% | 1.31% | -3 min | 11.0% | 20,121 |
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
Why DL1211 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL1211 on MIA → ATL. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL1211 comes in late, and what that does to the departure.
DL1211 is usually the aircraft’s first flight of the day: the schedule gives it a median of 9.2 hours on the ground at MIA, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, DL1211 pushed back an average of 12 minutes late; when it came in on time or early, an average of 2 minutes early.
Each departure is matched to the flight the same aircraft flew into MIA just before it, using the tail number in the DOT file, 684 of 745 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| DL1211 | 33% | 10% | 3% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often DL1211’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often DL1211 left 15 or more minutes late is about the same as the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
From pushback to gate
When it leaves MIA late, does that still matter by the time it reaches ATL?
DL1211 pushes back an average of 5.9 minutes late and reaches the gate at ATL an average of 3.2 minutes late. The 2.7 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 20.3 minutes on the taxiways at MIA, 2.3 minutes longer than a typical MIA departure in the same hour.
On arrival at ATL, DL1211 spends 12.4 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 2.8 minutes longer than a typical ATL arrival (9.6 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached ATL. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 19,818 departures from MIA scheduled in the clock hour DL1211 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at ATL (1,012,161 flights), not just DL1211’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
The hour it leaves MIA
Part of any flight’s record belongs to the clock rather than to the flight. DL1211 has one departure time, so this is what that time is worth.
On-time arrival rate. 19,818 departures from MIA are scheduled in the 7 AM–8 AM hour over the period, against 340,469 across the whole day.
DL1211 is scheduled out of MIA at 7:00 AM, in the 7 AM–8 AM bank. Departures from MIA in that hour arrive on time 89.1% of the time against 73.2% across the airport’s whole day — the slot alone is worth 16.0 points better before anything about this particular flight is considered.
The two airport figures cover every departure from MIA to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes DL1211 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| ATL→MCO Atlanta to Orlando | May 7, 2024 – June 6, 2024 | 31 | — |
| MCO→ATL Orlando to Atlanta | May 7, 2024 – June 6, 2024 | 28 | — |
| MCO→BOS Orlando to Boston | April 9, 2024 – May 6, 2024 | 28 | — |
| MSP→FAR Minneapolis to Fargo | March 10, 2024 – April 8, 2024 | 22 | — |
| STL→DTW St. Louis to Detroit | January 8, 2024 – March 9, 2024 | 62 | — |
| DEN→SEA Denver to Seattle | December 16–30, 2023 | 13 | — |
| SEA→DEN Seattle to Denver | December 16–30, 2023 | 13 | — |
| FLL→JFK Fort Lauderdale to New York | September 5, 2023 – December 15, 2023 | 75 | — |
| JFK→FLL New York to Fort Lauderdale | September 5, 2023 – December 15, 2023 | 75 | — |
| MIA→MCO Miami to Orlando | October 9, 2023 – November 4, 2023 | 27 | — |
| BUF→BOS Buffalo to Boston | July 1, 2023 – August 6, 2023 | 29 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1211 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
12 min late
against a median of 7 min early
Percentiles over 761 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1249 | Delta Air Lines | 92.2% | 11 min early | 693 |
| DL1211 this flight | Delta Air Lines | 91.0% | 7 min early | 761 |
| DL1261 | Delta Air Lines | 88.4% | 9 min early | 785 |
| AA1046 | American Airlines | 83.1% | 7 min early | 625 |
| DL2836 | Delta Air Lines | 79.0% | 5 min early | 940 |
| F92483 | Frontier Airlines | 76.2% | 5 min early | 808 |
| DL1510 | Delta Air Lines | 74.1% | 3 min early | 1,127 |
| DL1332 | Delta Air Lines | 68.8% | 1 min early | 1,016 |
| DL1579 | Delta Air Lines | 64.1% | 2 min late | 680 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL1211 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 761 records of DL1211 operating MIA → ATL, 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 excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
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
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