Flight number record
DL 2579
Delta Air Lines · Baltimore to Atlanta
- Route
- BWI → ATL
- Departs
- 07:00
- Flights
- 326
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 13 points better than the national rate of 77.3%. 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 13 points better than the US average of 77.3%. That gap is worth roughly 125 fewer late arrivals for every thousand flights.
Key figures
On time
89.8%
Arrivals under 15 minutes late, of 315 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
2.76%
National rate is 1.89%
1 hour+ late
3.2%
National rate is 8.3%
These figures cover 326 flights between September 2025 and August 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.
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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 150 of 326 flights, with 07:05 (51 flights) and 07:28 (40 flights) next.
- Departs 07:00150 flights46.0%
- Departs 07:0551 flights15.6%
- Departs 07:2840 flights12.3%
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 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 89.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 2579 next to BWI to ATL
Every carrier on BWI to ATL combined arrived on time 79.9% of the time across 5,405 flights, so DL 2579 is 10 points ahead of it. Delta flew 2,790 flights on the same city pair under all its flight numbers, including this one, and those ran 86.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2579thin sample | 326 | 89.8% | 66 min | 2.76% | A |
| All Delta Air Lines on BWI–ATL | 2,790 | 86.0% | 85 min | 2.11% | A |
| All carriers on BWI–ATL | 5,405 | 79.9% | 70 min | 2.33% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 Jul–Sep 2026 at 86.2%, a swing of 12 points on roughly 65 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 202592 flights87.0%
- Jan–Mar 202651 flights97.9%
- Apr–Jun 202691 flights90.8%
- Jul–Sep 202662 flights86.2%
Scale runs 80% to 100%.
By weekday, DL 2579 ranged from 84.4% on Wednesday to 93.5% on Saturday. 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.
Arrival by arrival
How late DL 2579 runs when it is late
DL 2579 often beats the schedule: 98 of 315 completed flights, 31%, arrived 15 minutes or more early. The 32 late arrivals split 15 under half an hour, 7 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early98 flights31.1%
- Within 15 min185 flights58.7%
- 15–29 min late15 flights4.8%
- 30–59 min late7 flights2.2%
- 1–2 hours late7 flights2.2%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 315 completed flights by arrival against schedule.
A late pushback is often recovered here: of 26 departures that left 15 minutes late or more, 8 still arrived on time. 14 flights left on time and still arrived late.
The worst days
Worst days for DL 2579
The latest arrival of the period was on 7 December 2025, 9 hours 22 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 9 hours 22 minutes | Carrier |
| 21 October 2025 | 3 hours 46 minutes | Carrier |
| 12 August 2026 | 3 hours 7 minutes | Late-arriving aircraft |
| 25 November 2025 | 1 hour 36 minutes | National Airspace System |
| 20 November 2025 | 1 hour 29 minutes | Carrier |
Delay causes
Why DL 2579 runs late
Carrier accounts for 63% of the 2,110 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 29%National Airspace System
- 9%Late-arriving aircraft
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,321 of the 2,110 delay minutes reported here. The split is drawn from 2,110 delay minutes reported on DL 2579.
Cancellations run at 2.76%, against 1.89% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.2% 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 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.
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, the cancellation rate is the figure to plan around on DL 2579: 2.76% of its 326 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BWI to ATL, every carrier and departure
- ATL to BWI, the return direction
- Delta Air Lines 2950 on the same route92.9%
- Frontier Airlines 2633 on the same route76.3%
- Delta Air Lines 2562 on the same route90.7%
- Delta Air Lines 801 on the same route86.5%
- Delta Air Lines 2711 on the same route85.0%
- Delta Air Lines 2799 on the same route76.9%
- Baltimore/Washington International Thurgood Marshall (BWI) 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
- What a cancellation rate actually tells you (and what it hides)
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.