Flight number record
DL 2527
Delta Air Lines · Atlanta to Newark
- Route
- ATL → EWR
- Departs
- 20:52
- Flights
- 315
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2527, check with Delta Air Lines.
DL 2527 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 315 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.6%, so DL 2527 runs 15 points behind the country as a whole. Across a thousand flights that is about 149 extra late arrivals.
Key figures
On time
62.7%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
2.54%
National rate is 1.81%
1 hour+ late
14.4%
National rate is 8.1%
These figures cover 315 flights between July 2025 and June 2026. Beyond the headline rate, 14.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When DL 2527 flies
DL 2527 flies ATL to EWR without a single fixed slot. Its most common scheduled departure was 20:52, used on 57 of 315 flights, with 20:59 (43 flights) and 21:50 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 20:5257 flights18.1%
- Departs 20:5943 flights13.7%
- Departs 21:5038 flights12.1%
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 20:52 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 2527 runs 8 points worse at 62.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
DL 2527 next to ATL to EWR
Every carrier on ATL to EWR combined arrived on time 72.8% of the time across 6,285 flights, so DL 2527 is 10 points behind it. Delta flew 3,055 flights on the same city pair under all its flight numbers, including this one, and those ran 71.5% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 19 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2527thin sample | 315 | 62.7% | 69 min | 2.54% | D |
| All Delta Air Lines on ATL–EWR | 3,055 | 71.5% | 66 min | 3.31% | C− |
| All carriers on ATL–EWR | 6,285 | 72.8% | 74 min | 3.34% | C− |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 2527 quarter by quarter
DL 2527 did not run the same all year. Its best quarter was Apr–Jun 2026 at 75.6% on time and its weakest Jul–Sep 2025 at 55.1%, a swing of 20 points on roughly 79 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 202591 flights55.1%
- Oct–Dec 202572 flights58.6%
- Jan–Mar 202673 flights62.3%
- Apr–Jun 202679 flights75.6%
Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2527 did best on Tuesday at 70.0% on time and worst on Thursday at 54.2%. Each day rests on about 45 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 2527 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 7,841 reported delay minutes.
- 40%National Airspace System
- 31%Carrier
- 21%Late-arriving aircraft
- 8%Extreme weather
- 1%Security
40% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,138 minutes out of 7,841, against a national NAS share of 21%. The split is drawn from 7,841 delay minutes reported on DL 2527.
Cancellations run at 2.54%, against 1.81% nationally. That is about 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 746 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 315 flights under DL 2527 in the data flew ATL to EWR. 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. 315 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 2527
For a booking, the cancellation rate is the figure to plan around on DL 2527: 2.54% of its 315 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to EWR, every carrier and departure
- EWR to ATL, the return direction
- Delta Air Lines 2322 on the same route74.4%
- Frontier Airlines 4602 on the same route56.0%
- Delta Air Lines 2312 on the same route69.9%
- Delta Air Lines 2397 on the same route86.1%
- Delta Air Lines 2498 on the same route56.2%
- Frontier Airlines 1158 on the same route69.4%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Newark Liberty International (EWR) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.