Flight number record
DL 2539
Delta Air Lines · Atlanta to Greensboro
- Route
- ATL → GSO
- Departs
- 15:20
- Flights
- 310
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2539, check with Delta Air Lines.
DL 2539 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 310 flights, with a median arrival 6 minutes early.
Set against the rest of the country, DL 2539's record is 9 points better than the US average of 77.3%. That gap is worth roughly 86 fewer late arrivals for every thousand flights.
Key figures
On time
85.9%
Arrivals under 15 minutes late, of 305 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.29%
National rate is 1.89%
1 hour+ late
6.2%
National rate is 8.3%
These figures cover 310 flights between September 2025 and August 2026. The median arrival is 6 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 2539 flies
DL 2539 flies ATL to GSO without a single fixed slot. Its most common scheduled departure was 15:20, used on 44 of 310 flights, with 14:10 (32 flights) next.
- Departs 15:2044 flights14.2%
- Departs 14:1032 flights10.3%
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 15:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2539 runs 14 points better at 85.9%. 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 2539 next to ATL to GSO
Every carrier on ATL to GSO combined arrived on time 83.7% of the time across 2,730 flights, so DL 2539 is 2 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2539thin sample | 310 | 85.9% | 63 min | 1.29% | A |
| All Delta Air Lines on ATL–GSO | 2,730 | 83.7% | 59 min | 1.94% | B |
| All carriers on ATL–GSO | 2,730 | 83.7% | 59 min | 1.94% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2539 quarter by quarter
DL 2539 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 82.0%, a swing of 11 points on roughly 62 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 flights93.3%
- Oct–Dec 202579 flights85.7%
- Jan–Mar 202662 flights86.7%
- Apr–Jun 202677 flights85.7%
- Jul–Sep 202662 flights82.0%
Scale runs 75% to 100%.
By weekday, DL 2539 did best on Saturday at 92.7% on time and worst on Monday at 77.8%. Each day rests on about 44 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2539 runs when it is late
The 43 late arrivals split 11 under half an hour, 13 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early51 flights16.7%
- Within 15 min211 flights69.2%
- 15–29 min late11 flights3.6%
- 30–59 min late13 flights4.3%
- 1–2 hours late13 flights4.3%
- 2+ hours late6 flights2.0%
Scale runs 0% to 100%.
Share of 305 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 44 departures that left 15 minutes late or more, only 5 made it up before arrival. Only 4 left on time and still arrived late.
The worst days
Worst days for DL 2539
The latest arrival of the period was on 28 July 2026, 2 hours 55 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 |
|---|---|---|
| 28 July 2026 | 2 hours 55 minutes | Carrier |
| 4 August 2026 | 2 hours 34 minutes | Carrier |
| 30 November 2025 | 2 hours 15 minutes | Carrier |
| 9 February 2026 | 2 hours 12 minutes | Carrier |
| 5 January 2026 | 2 hours 3 minutes | Carrier |
Delay causes
Why DL 2539 runs late
Carrier accounts for 60% of the 2,698 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 18%Late-arriving aircraft
- 16%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,608 of the 2,698 delay minutes reported here. The split is drawn from 2,698 delay minutes reported on DL 2539.
Cancellations sit at 1.29% against a national 1.89%, which is ordinary. Diversions add another 0.32%.
Connections and routes
What a delay on this flight costs
6.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
DL 2539 is not only a ATL to GSO flight. It also flew GSO to ATL (286 flights, 83.5% 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. 310 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 |
|---|---|---|---|---|---|
| GSO to ATLthin sample | 286 | 83.5% | 102 min | 1.75% | B |
What to do with this
Booking DL 2539
For a booking, DL 2539 has one of the better records a US domestic flight can show: 85.9% on time and 1.29% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- ATL to GSO, every carrier and departure
- GSO to ATL, the return direction
- Delta Air Lines 3005 on the same route83.0%
- Delta Air Lines 1617 on the same route79.9%
- 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.