Flight number record
DL 1477
Delta Air Lines · Atlanta to Chicago
- Route
- ATL → ORD
- Departs
- 13:02
- Flights
- 356
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1477, check with Delta Air Lines.
DL 1477 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 356 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so DL 1477 runs 4 points behind the country as a whole. Across a thousand flights that is about 44 extra late arrivals.
Key figures
On time
72.9%
Arrivals under 15 minutes late, of 350 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.69%
National rate is 1.89%
1 hour+ late
9.1%
National rate is 8.3%
These figures cover 356 flights between September 2025 and August 2026. Beyond the headline rate, 9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1477 flies
DL 1477 flies ATL to ORD without a single fixed slot. Its most common scheduled departure was 13:02, used on 40 of 356 flights.
- Departs 13:0240 flights11.2%
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 13:02 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1477 runs 5 points worse at 72.9%. 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 1477 next to ATL to ORD
Every carrier on ATL to ORD combined arrived on time 69.0% of the time across 6,493 flights, so DL 1477 is 4 points ahead of it. Delta flew 2,631 flights on the same city pair under all its flight numbers, including this one, and those ran 67.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1477thin sample | 356 | 72.9% | 64 min | 1.69% | C |
| All Delta Air Lines on ATL–ORD | 2,631 | 67.6% | 63 min | 2.20% | C |
| All carriers on ATL–ORD | 6,493 | 69.0% | 83 min | 2.40% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1477 quarter by quarter
DL 1477 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 64.0%, a swing of 26 points on roughly 71 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 flights90.0%
- Oct–Dec 202586 flights74.7%
- Jan–Mar 202687 flights64.0%
- Apr–Jun 202691 flights75.3%
- Jul–Sep 202662 flights71.0%
Scale runs 55% to 95%.
By weekday, DL 1477 ranged from 68.0% on Wednesday to 78.8% on Saturday. With about 51 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 1477 runs when it is late
The 95 late arrivals split 41 under half an hour, 22 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early47 flights13.4%
- Within 15 min208 flights59.4%
- 15–29 min late41 flights11.7%
- 30–59 min late22 flights6.3%
- 1–2 hours late21 flights6.0%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 350 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 68 departures that left 15 minutes late or more, only 6 made it up before arrival. In the other direction, 33 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ORD.
The worst days
Worst days for DL 1477
The latest arrival of the period was on 29 November 2025, 5 hours 59 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 November 2025 | 5 hours 59 minutes | National Airspace System |
| 6 March 2026 | 5 hours 51 minutes | Extreme weather |
| 3 July 2026 | 4 hours 55 minutes | National Airspace System |
| 9 August 2026 | 4 hours 35 minutes | National Airspace System |
| 17 June 2026 | 4 hours 27 minutes | National Airspace System |
Delay causes
Why DL 1477 runs late
National Airspace System accounts for 60% of the 6,106 delay minutes carriers reported here, and the remaining four split what is left.
- 60%National Airspace System
- 30%Carrier
- 5%Late-arriving aircraft
- 4%Extreme weather
60% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,675 minutes out of 6,106, against a national NAS share of 21%. The split is drawn from 6,106 delay minutes reported on DL 1477.
Cancellations sit at 1.69% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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.
DL 1477 is not only a ATL to ORD flight. It also flew ORD to ATL (291 flights, 71.8% 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. 356 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 |
|---|---|---|---|---|---|
| ORD to ATLthin sample | 291 | 71.8% | 93 min | 1.72% | C |
What to do with this
Booking DL 1477
For a booking, read DL 1477 as 72.9% on time with 1.69% cancelled over 356 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to ORD, every carrier and departure
- ORD to ATL, the return direction
- Delta Air Lines 2738 on the same route57.6%
- United Airlines 516 on the same route70.8%
- Delta Air Lines 1147 on the same route79.0%
- Delta Air Lines 2879 on the same route45.6%
- Frontier Airlines 1441 on the same route72.7%
- Delta Air Lines 1199 on the same route70.6%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Chicago O'Hare International (ORD) 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
- How often a connection fails at the major US hubs
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.