Flight profile · Delta Air Lines
DL1264
Chicago (ORD) to Atlanta (ATL) · scheduled 5:30 AM – 8:52 AM
How DL1264 performs
784 operations, June 2024 – July 2026.
DL1264 arrived on time 88.8% of the time, against 75.6% for all ORD → ATL flights, so this departure is 13.2 percentage points better than the route as a whole. Against Delta Air Lines’ own flights on this route it is 8.9 points better.
DL1264’s scheduled departure has moved during the period FlyerIntel has on file: it typically left around 6:00 AM earlier on, and around 5:30 AM more recently — a 30-minute shift, not the few minutes of day-to-day rounding every published schedule carries. Confirm the current departure time before booking around an older listing.
Source: US DOT Bureau of Transportation Statistics · 784 operations, June 2024 – July 2026 · If DL1264 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 DL1264 compares to other flight numbers, not just to itself.
This flight runs unusually far ahead of the ORD → ATL route as a whole, better than 96% of 11,788 comparable flight numbers.
88.8% on time for this specific departure, against 75.6% for every ORD → 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 DL1264 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 |
|---|---|---|---|---|---|
| DL1264 | 88.8% | 1.79% | -10 min | 3.9% | 784 |
| Delta Air Lines on ORD → ATL | 79.9% | 1.44% | -7 min | 7.3% | 7,713 |
| All ORD → ATL flights | 75.6% | 1.62% | -6 min | 9.3% | 18,588 |
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
Why DL1264 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 DL1264 on ORD → 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 DL1264 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, DL1264 pushed back an average of 12 minutes late; when it came in on time or early, an average of 2 minutes late.
Each departure is matched to the flight the same aircraft flew into ORD just before it, using the tail number in the DOT file, 737 of 770 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 |
|---|---|---|---|
| DL1264 | 27% | 14% | 6% |
| Network, same turn | 33% | 24% | 11% |
The schedule leaves a long gap on the ground, which gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 3 to 6 hours. How often DL1264’s aircraft landed 15 or more minutes late is lower than the network’s and, once the aircraft was late, how often DL1264 left 15 or more minutes late is lower than 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 ORD late, does that still matter by the time it reaches ATL?
DL1264 pushes back an average of 5.4 minutes late and reaches the gate at ATL an average of 1.6 minutes early. The 7.0 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 18.2 minutes on the taxiways at ORD, 1.5 minutes longer than a typical ORD departure in the same hour.
On arrival at ATL, DL1264 spends 9.7 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 ATL spends on the ground before reaching the gate.
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 9,462 departures from ORD scheduled in the clock hour DL1264 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 DL1264’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
The hour it leaves ORD
Part of any flight’s record belongs to the clock rather than to the flight. DL1264 has one departure time, so this is what that time is worth.
On-time arrival rate. 9,462 departures from ORD are scheduled in the 5 AM–6 AM hour over the period, against 952,802 across the whole day.
DL1264 is scheduled out of ORD at 5:30 AM, in the 5 AM–6 AM bank. Departures from ORD in that hour arrive on time 88.7% of the time against 74.5% across the airport’s whole day — the slot alone is worth 14.2 points better before anything about this particular flight is considered.
The two airport figures cover every departure from ORD 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 DL1264 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 |
|---|---|---|---|
| LGA→MCO New York to Orlando | July 1, 2023 – June 6, 2024 | 186 | 67.2% |
| MSP→SLC Minneapolis to Salt Lake City | April 11, 2024 – May 6, 2024 | 16 | — |
| SEA→SJC Seattle to San Jose | April 8, 2024 | 1 | — |
| MIA→JFK Miami to New York | March 12, 2024 – April 6, 2024 | 12 | — |
| SLC→DFW Salt Lake City to Dallas–Fort Worth | January 8, 2024 – March 8, 2024 | 50 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1264 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.
17 min late
against a median of 10 min early
Percentiles over 784 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 |
|---|---|---|---|---|
| DL1264 this flight | Delta Air Lines | 88.8% | 10 min early | 784 |
| DL1178 | Delta Air Lines | 87.3% | 10 min early | 957 |
| DL1247 | Delta Air Lines | 87.1% | 10 min early | 774 |
| DL1147 | Delta Air Lines | 81.2% | 7 min early | 1,051 |
| DL1477 | Delta Air Lines | 72.1% | 5 min early | 914 |
| DL2738 | Delta Air Lines | 71.3% | 4 min early | 912 |
| F91596 | Frontier Airlines | 69.0% | 0 min early | 868 |
| AA2779 | American Airlines | 59.9% | 5 min late | 725 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL1264 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 784 records of DL1264 operating ORD → 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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