Flight number record
DL 1504
Delta Air Lines · Pittsburgh to Atlanta
- Route
- PIT → ATL
- Departs
- 06:00
- Flights
- 359
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1504, check with Delta Air Lines.
DL 1504 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 359 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 1504's record is 14 points better than the US average of 77.3%. That gap is worth roughly 142 fewer late arrivals for every thousand flights.
Key figures
On time
91.5%
Arrivals under 15 minutes late, of 351 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
1.95%
National rate is 1.89%
1 hour+ late
2.0%
National rate is 8.3%
These figures cover 359 flights between September 2025 and August 2026. The median arrival is 13 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 1504 flies
DL 1504 flies PIT to ATL without a single fixed slot. Its most common scheduled departure was 06:00, used on 248 of 359 flights.
- Departs 06:00248 flights69.1%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1504 runs 2 points better at 91.5%. 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 1504 next to PIT to ATL
Every carrier on PIT to ATL combined arrived on time 89.2% of the time across 2,737 flights, so DL 1504 is 2 points ahead of it. Delta flew 2,452 flights on the same city pair under all its flight numbers, including this one, and those ran 89.6% 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 1504thin sample | 359 | 91.5% | 75 min | 1.95% | A |
| All Delta Air Lines on PIT–ATL | 2,452 | 89.6% | 75 min | 2.08% | A |
| All carriers on PIT–ATL | 2,737 | 89.2% | 69 min | 1.90% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1504 quarter by quarter
DL 1504 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 86.2%, a swing of 11 points on roughly 72 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 flights88.8%
- Jan–Mar 202690 flights86.2%
- Apr–Jun 202688 flights95.4%
- Jul–Sep 202659 flights94.8%
Scale runs 80% to 100%.
By weekday, DL 1504 ranged from 87.8% on Monday to 94.0% on Thursday. With about 51 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 1504 runs when it is late
DL 1504 often beats the schedule: 167 of 351 completed flights, 48%, arrived 15 minutes or more early. The 30 late arrivals split 10 under half an hour, 13 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early167 flights47.6%
- Within 15 min154 flights43.9%
- 15–29 min late10 flights2.8%
- 30–59 min late13 flights3.7%
- 1–2 hours late3 flights0.9%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 351 completed flights by arrival against schedule.
6 of 24 late departures made up the time and arrived on time, 25% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 1504
The latest arrival of the period was on 29 September 2025, 7 hours 22 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 September 2025 | 7 hours 22 minutes | Carrier |
| 13 June 2026 | 6 hours 16 minutes | Carrier |
| 22 March 2026 | 4 hours 48 minutes | Carrier |
| 23 January 2026 | 3 hours 11 minutes | Carrier |
| 1 January 2026 | 1 hour 20 minutes | Carrier |
Delay causes
Why DL 1504 runs late
Carrier accounts for 77% of the 2,262 delay minutes carriers reported here, and the remaining four split what is left.
- 77%Carrier
- 19%National Airspace System
- 2%Extreme weather
- 2%Late-arriving aircraft
The largest share of delay minutes, 77%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,740 of the 2,262 delay minutes reported here. The split is drawn from 2,262 delay minutes reported on DL 1504.
Cancellations sit at 1.95% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.0% 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 526 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 359 flights under DL 1504 in the data flew PIT 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. 359 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 1504
For a booking, read DL 1504 as 91.5% on time with 1.95% cancelled over 359 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- PIT to ATL, every carrier and departure
- ATL to PIT, the return direction
- Delta Air Lines 1383 on the same route93.0%
- Delta Air Lines 1353 on the same route83.4%
- Delta Air Lines 1363 on the same route92.7%
- Delta Air Lines 1380 on the same route92.9%
- Pittsburgh International (PIT) 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.