Flight number record

DL 2539

Delta Air Lines · Atlanta to Greensboro

Route: ATL → GSO
Departs: 14:51
Flights: 310
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2539, check with Delta Air Lines.

DL 2539 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 310 flights, with a median arrival 7 minutes early.

Set against the rest of the country, DL 2539's record is 7 points better than the US average of 77.6%. That gap is worth roughly 66 fewer late arrivals for every thousand flights.

On time

84.2%

Arrivals under 15 minutes late, of 304 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

1.29%

National rate is 1.81%

1 hour+ late

5.3%

National rate is 8.1%

These figures cover 310 flights between July 2025 and June 2026. The median arrival is 7 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 2539 flies

DL 2539 flies ATL to GSO without a single fixed slot. Its most common scheduled departure was 14:51, used on 47 of 310 flights, with 15:20 (44 flights) and 14:10 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:5147 flights15.2%
Departs 15:2044 flights14.2%
Departs 14:1032 flights10.3%

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 14:51 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 2539 runs 12 points better at 84.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 2539 next to ATL to GSO

Every carrier on ATL to GSO combined arrived on time 83.8% of the time across 2,755 flights, so DL 2539 is about level with it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 3 points.

DL 2539 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2539thin sample	310	84.2%	53 min	1.29%	B
All Delta Air Lines on ATL–GSO	2,755	83.8%	59 min	1.92%	B
All carriers on ATL–GSO	2,755	83.8%	59 min	1.92%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2539 quarter by quarter

Quarter by quarter DL 2539 held fairly steady: 80.0% in Jul–Sep 2025, 85.7% in Oct–Dec 2025, 86.7% in Jan–Mar 2026 and 85.7% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights80.0%
Oct–Dec 202579 flights85.7%
Jan–Mar 202662 flights86.7%
Apr–Jun 202677 flights85.7%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2539 did best on Friday at 93.2% on time and worst on Monday at 73.3%. Each day rests on about 44 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2539 runs late

One category carries most of the weight here. Carrier accounts for 57% of the 2,543 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
57%
Late-arriving aircraft
23%
National Airspace System
14%
Extreme weather
6%

The largest share of delay minutes, 57%, 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 1,446 of the 2,543 delay minutes reported here. The split is drawn from 2,543 delay minutes reported on DL 2539.

Cancellations sit at 1.29% against a national 1.81%, which is ordinary. Diversions add another 0.65%.

Connections and routes

What a delay on this flight costs

5.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 55 minutes, which a normal layover absorbs.

DL 2539 is not only a ATL to GSO flight. It also flew GSO to ATL (285 flights, 85.3% 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.

Other routes flown as DL 2539
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
GSO to ATLthin sample	285	85.3%	93 min	1.75%	A

What to do with this

Booking DL 2539

For a booking, read DL 2539 as 84.2% on time with 1.29% cancelled over 310 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