Flight number record

DL 1504

Delta Air Lines · Pittsburgh to Atlanta

Route: PIT → ATL
Departs: 06:00
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 362 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 77.6%. That gap is worth roughly 136 fewer late arrivals for every thousand flights.

On time

91.2%

Arrivals under 15 minutes late, of 353 completed flights

Avg delay

78 min

Across delayed arrivals only, not all flights

Cancelled

2.21%

National rate is 1.81%

1 hour+ late

2.3%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 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.

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 269 of 362 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:00269 flights74.3%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 level with that at 91.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 1504 next to PIT to ATL

Every carrier on PIT to ATL combined arrived on time 90.3% of the time across 2,777 flights, so DL 1504 is about level with it. Delta flew 2,475 flights on the same city pair under all its flight numbers, including this one, and those ran 90.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 10 points.

DL 1504 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1504thin sample	362	91.2%	78 min	2.21%	A
All Delta Air Lines on PIT–ATL	2,475	90.7%	71 min	2.34%	A
All carriers on PIT–ATL	2,777	90.3%	66 min	2.12%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1504 quarter by quarter

Quarter by quarter DL 1504 held fairly steady: 94.4% in Jul–Sep 2025, 88.8% in Oct–Dec 2025, 86.2% in Jan–Mar 2026 and 95.4% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights94.4%
Oct–Dec 202592 flights88.8%
Jan–Mar 202690 flights86.2%
Apr–Jun 202688 flights95.4%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1504 ranged from 83.3% on Monday to 94.2% on Tuesday. With about 52 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.

Delay causes

Why DL 1504 runs late

One category carries most of the weight here. Carrier accounts for 80% of the 2,411 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
80%
National Airspace System
16%
Late-arriving aircraft
2%
Extreme weather
2%

The largest share of delay minutes, 80%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,935 of the 2,411 delay minutes reported here. The split is drawn from 2,411 delay minutes reported on DL 1504.

Cancellations sit at 2.21% against a national 1.81%, 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 2.3% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 362 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. 362 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 91.2% on time with 2.21% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures