Flight number record
DL 525
Delta Air Lines · Atlanta to New York
- Route
- ATL → LGA
- Departs
- 12:30
- Flights
- 335
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 525, check with Delta Air Lines.
DL 525 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land roughly 55 minutes behind schedule. That rests on 335 flights, with a median arrival 2 minutes early.
Key figures
On time
73.9%
Arrivals under 15 minutes late, of 322 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
2.99%
National rate is 1.89%
1 hour+ late
6.8%
National rate is 8.3%
These figures cover 335 flights between September 2025 and August 2026. The median arrival is 2 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 525 flies
DL 525 is scheduled to leave Atlanta (ATL) at 12:30 local time and reach New York (LGA) at 14:44. That slot held for 325 of the 335 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 12:30325 flights97.0%
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 12:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 525 runs 4 points worse at 73.9%. 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 525 next to ATL to LGA
Every carrier on ATL to LGA combined arrived on time 72.3% of the time across 8,502 flights, so DL 525 is 2 points ahead of it. Delta flew 4,937 flights on the same city pair under all its flight numbers, including this one, and those ran 75.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 525thin sample | 335 | 73.9% | 54 min | 2.99% | C |
| All Delta Air Lines on ATL–LGA | 4,937 | 75.9% | 66 min | 3.48% | B− |
| All carriers on ATL–LGA | 8,502 | 72.3% | 79 min | 4.34% | C− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 525 quarter by quarter
DL 525 did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.0% on time and its weakest Oct–Dec 2025 at 61.0%, a swing of 23 points on roughly 84 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 202527 flights—
- Oct–Dec 202579 flights61.0%
- Jan–Mar 202686 flights84.0%
- Apr–Jun 202681 flights77.2%
- Jul–Sep 202662 flights69.0%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 525 did best on Saturday at 85.3% on time and worst on Thursday at 67.3%. Each day rests on about 48 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 525 runs when it is late
The 84 late arrivals split 37 under half an hour, 25 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early65 flights20.2%
- Within 15 min173 flights53.7%
- 15–29 min late37 flights11.5%
- 30–59 min late25 flights7.8%
- 1–2 hours late16 flights5.0%
- 2+ hours late6 flights1.9%
Scale runs 0% to 100%.
Share of 322 completed flights by arrival against schedule.
13 of 63 late departures made up the time and arrived on time, 21% of them. In the other direction, 34 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LGA.
The worst days
Worst days for DL 525
The latest arrival of the period was on 30 October 2025, 6 hours 36 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across October, December, November and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 October 2025 | 6 hours 36 minutes | National Airspace System |
| 7 December 2025 | 4 hours 1 minute | Late-arriving aircraft |
| 10 November 2025 | 3 hours 3 minutes | National Airspace System |
| 29 November 2025 | 2 hours 33 minutes | Carrier |
| 17 February 2026 | 2 hours 33 minutes | Carrier |
Delay causes
Why DL 525 runs late
National Airspace System accounts for 55% of the 4,498 delay minutes carriers reported here, and the remaining four split what is left.
- 55%National Airspace System
- 33%Carrier
- 12%Late-arriving aircraft
- 0%Extreme weather
55% 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 2,482 minutes out of 4,498, against a national NAS share of 21%. The split is drawn from 4,498 delay minutes reported on DL 525.
Cancellations run at 2.99%, against 1.89% nationally. That is roughly one flight in 30 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
6.8% 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 roughly 55 minutes, which a normal layover absorbs.
The 762 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 two other city pairs in the data, including ATL to MSN (4) and LAS to JFK (1), but none flew often enough under DL 525 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to LGA only.
One caution: this is a thin sample. 335 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 525
For a booking, the cancellation rate is the figure to plan around on DL 525: 2.99% of its 335 scheduled flights did not operate. A late arrival costs roughly 55 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to LGA, every carrier and departure
- LGA to ATL, the return direction
- Delta Air Lines 520 on the same route69.5%
- Frontier Airlines 3288 on the same route36.9%
- Delta Air Lines 513 on the same route87.7%
- Delta Air Lines 997 on the same route67.1%
- Delta Air Lines 371 on the same route84.7%
- Delta Air Lines 434 on the same route62.1%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- LaGuardia (LGA) 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.