Flight number record
DL 525
Delta Air Lines · Atlanta to New York
- Route
- ATL → LGA
- Departs
- 12:30
- Flights
- 335
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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, 4 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 335 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.6%, so DL 525 runs 4 points behind the country as a whole. Across a thousand flights that is about 44 extra late arrivals.
Key figures
On time
73.2%
Arrivals under 15 minutes late, of 325 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
1.79%
National rate is 1.81%
1 hour+ late
6.8%
National rate is 8.1%
These figures cover 335 flights between July 2025 and June 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.
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%. 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 12:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 525 runs 6 points worse at 73.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
DL 525 next to ATL to LGA
Every carrier on ATL to LGA combined arrived on time 73.4% of the time across 8,344 flights, so DL 525 is about level with it. Delta flew 4,936 flights on the same city pair under all its flight numbers, including this one, and those ran 76.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 525thin sample | 335 | 73.2% | 56 min | 1.79% | C |
| All Delta Air Lines on ATL–LGA | 4,936 | 76.7% | 66 min | 2.96% | B |
| All carriers on ATL–LGA | 8,344 | 73.4% | 75 min | 3.61% | C− |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | 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 202589 flights70.5%
- Oct–Dec 202579 flights61.0%
- Jan–Mar 202686 flights84.0%
- Apr–Jun 202681 flights77.2%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 525 did best on Friday at 80.0% on time and worst on Sunday at 65.2%. Each day rests on about 48 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 525 runs late
One category carries most of the weight here. National Airspace System accounts for 46% of the 4,895 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.
- 46%National Airspace System
- 42%Carrier
- 12%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 42%, 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 2,050 of the 4,895 delay minutes reported here. The split is drawn from 4,895 delay minutes reported on DL 525.
Cancellations sit at 1.79% against a national 1.81%, which is ordinary. Diversions add another 1.19%.
Connections and routes
What a delay on this flight costs
6.8% of arrivals land an hour or more late, close to the national 8.1%. 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 about an hour, 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. 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.
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, read DL 525 as 73.2% on time with 1.79% cancelled over 335 flights. Those are rates from the past twelve months, not a forecast for any particular day.
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 route70.4%
- Frontier Airlines 3288 on the same route40.8%
- Delta Air Lines 997 on the same route66.2%
- Delta Air Lines 513 on the same route88.6%
- Delta Air Lines 371 on the same route85.5%
- Delta Air Lines 434 on the same route62.2%
- 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.