Flight number record

DL 2579

Delta Air Lines · Baltimore to Atlanta

Route: BWI → ATL
Departs: 07:00
Flights: 326
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2579, check with Delta Air Lines.

DL 2579 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 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 326 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 2579's record is 12 points better than the US average of 77.6%. That gap is worth roughly 124 fewer late arrivals for every thousand flights.

On time

90.0%

Arrivals under 15 minutes late, of 319 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

1.53%

National rate is 1.81%

1 hour+ late

2.8%

National rate is 8.1%

These figures cover 326 flights between July 2025 and June 2026. The median arrival is 8 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 2579 flies

DL 2579 flies BWI to ATL without a single fixed slot. Its most common scheduled departure was 07:00, used on 111 of 326 flights, with 07:05 (51 flights) and 07:28 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00111 flights34.0%
Departs 07:0551 flights15.6%
Departs 07:2836 flights11.0%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2579 runs level with that at 90.0%. 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 2579 next to BWI to ATL

Every carrier on BWI to ATL combined arrived on time 80.6% of the time across 5,415 flights, so DL 2579 is 9 points ahead of it. Delta flew 2,824 flights on the same city pair under all its flight numbers, including this one, and those ran 86.2% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 8 points.

DL 2579 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2579thin sample	326	90.0%	62 min	1.53%	A
All Delta Air Lines on BWI–ATL	2,824	86.2%	79 min	2.05%	A
All carriers on BWI–ATL	5,415	80.6%	70 min	1.87%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2579 quarter by quarter

DL 2579 did not run the same all year. Its best quarter was Jan–Mar 2026 at 97.9% on time and its weakest Oct–Dec 2025 at 87.0%, a swing of 11 points on roughly 82 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 202592 flights88.0%
Oct–Dec 202592 flights87.0%
Jan–Mar 202651 flights97.9%
Apr–Jun 202691 flights90.8%

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

By weekday, DL 2579 ranged from 84.8% on Wednesday to 93.5% on Tuesday. With about 47 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 2579 runs late

One category carries most of the weight here. Carrier accounts for 71% of the 1,973 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
71%
National Airspace System
29%

The largest share of delay minutes, 71%, 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 1,397 of the 1,973 delay minutes reported here. The split is drawn from 1,973 delay minutes reported on DL 2579.

Cancellations sit at 1.53% against a national 1.81%, which is ordinary. Diversions add another 0.61%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.8% 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 577 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.

The same number turns up on one other city pair in the data, including GSO to ATL (24), but none flew often enough under DL 2579 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BWI to ATL only.

One caution: this is a thin sample. 326 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 2579

For a booking, read DL 2579 as 90.0% on time with 1.53% cancelled over 326 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