Flight number record
DL 1264
Delta Air Lines · Chicago to Atlanta
- Route
- ORD → ATL
- Departs
- 05:30
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1264, check with Delta Air Lines.
DL 1264 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 flights, with a median arrival 14 minutes early.
Set against the rest of the country, DL 1264's record is 14 points better than the US average of 77.3%. That gap is worth roughly 140 fewer late arrivals for every thousand flights.
Key figures
On time
91.3%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 14 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 1264 flies
DL 1264 flies ORD to ATL without a single fixed slot. Its most common scheduled departure was 05:30, used on 250 of 365 flights.
- Departs 05:30250 flights68.5%
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 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1264 runs 2 points better at 91.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 1264 next to ORD to ATL
Every carrier on ORD to ATL combined arrived on time 74.1% of the time across 6,495 flights, so DL 1264 is 17 points ahead of it. Delta flew 2,629 flights on the same city pair under all its flight numbers, including this one, and those ran 79.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1264 | 365 | 91.3% | 73 min | 1.92% | A |
| All Delta Air Lines on ORD–ATL | 2,629 | 79.8% | 84 min | 2.40% | B |
| All carriers on ORD–ATL | 6,495 | 74.1% | 81 min | 2.31% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1264 quarter by quarter
DL 1264 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Oct–Dec 2025 at 86.4%, a swing of 10 points on roughly 73 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 202530 flights96.7%
- Oct–Dec 202592 flights86.4%
- Jan–Mar 202690 flights93.3%
- Apr–Jun 202691 flights93.3%
- Jul–Sep 202662 flights90.2%
Scale runs 80% to 100%.
By weekday, DL 1264 ranged from 88.0% on Sunday to 94.2% on Thursday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1264 runs when it is late
DL 1264 often beats the schedule: 178 of 357 completed flights, 50%, arrived 15 minutes or more early. The 31 late arrivals split 9 under half an hour, 13 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early178 flights49.9%
- Within 15 min148 flights41.5%
- 15–29 min late9 flights2.5%
- 30–59 min late13 flights3.6%
- 1–2 hours late4 flights1.1%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
9 of 31 late departures made up the time and arrived on time, 29% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for DL 1264
The latest arrival of the period was on 30 November 2025, 8 hours 49 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 November 2025 | 8 hours 49 minutes | Late-arriving aircraft |
| 11 March 2026 | 3 hours 21 minutes | Late-arriving aircraft |
| 2 May 2026 | 2 hours 26 minutes | Carrier |
| 7 March 2026 | 2 hours 21 minutes | Carrier |
| 5 July 2026 | 2 hours 14 minutes | Carrier |
Delay causes
Why DL 1264 runs late
Carrier accounts for 49% of the 2,259 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 31%Late-arriving aircraft
- 17%National Airspace System
- 3%Extreme weather
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,107 of the 2,259 delay minutes reported here. The split is drawn from 2,259 delay minutes reported on DL 1264.
Cancellations sit at 1.92% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.5% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 606 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.
Every one of the 365 flights under DL 1264 in the data flew ORD to ATL. The number was not reused on any other city pair, which makes this a clean record of one route.
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.
What to do with this
Booking DL 1264
For a booking, read DL 1264 as 91.3% on time with 1.92% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to ATL, every carrier and departure
- ATL to ORD, the return direction
- Delta Air Lines 1247 on the same route87.8%
- United Airlines 356 on the same route73.1%
- Delta Air Lines 1147 on the same route79.3%
- Delta Air Lines 1178 on the same route85.4%
- Frontier Airlines 1596 on the same route72.4%
- United Airlines 1398 on the same route56.2%
- Chicago O'Hare International (ORD) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.