Flight number record
DL 323
Delta Air Lines · Atlanta to New York
- Route
- ATL → LGA
- Departs
- 07:30
- Flights
- 337
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 323, check with Delta Air Lines.
DL 323 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 337 flights, with a median arrival 7 minutes early.
Set against the rest of the country, DL 323's record is 14 points better than the US average of 77.3%. That gap is worth roughly 135 fewer late arrivals for every thousand flights.
Key figures
On time
90.8%
Arrivals under 15 minutes late, of 325 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
2.97%
National rate is 1.89%
1 hour+ late
3.4%
National rate is 8.3%
These figures cover 337 flights between September 2025 and August 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.
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Schedule
When DL 323 flies
DL 323 is scheduled to leave Atlanta (ATL) at 07:30 local time and reach New York (LGA) at 09:39. That slot held for 319 of the 337 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 07:30319 flights94.7%
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 07:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 323 runs level with that at 90.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 323 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 323 is 19 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 beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 323thin sample | 337 | 90.8% | 50 min | 2.97% | A |
| 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 323 quarter by quarter
DL 323 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Oct–Dec 2025 at 88.5%, a swing of 12 points on roughly 67 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 flights100.0%
- Oct–Dec 202580 flights88.5%
- Jan–Mar 202676 flights91.7%
- Apr–Jun 202689 flights89.5%
- Jul–Sep 202662 flights89.8%
Scale runs 80% to 100%.
By weekday, DL 323 ranged from 85.7% on Wednesday to 94.1% on Friday. With about 48 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 323 runs when it is late
The 30 late arrivals split 13 under half an hour, 6 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early69 flights21.2%
- Within 15 min226 flights69.5%
- 15–29 min late13 flights4.0%
- 30–59 min late6 flights1.8%
- 1–2 hours late10 flights3.1%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 325 completed flights by arrival against schedule.
A late pushback is often recovered here: of 28 departures that left 15 minutes late or more, 9 still arrived on time. 11 flights left on time and still arrived late.
The worst days
Worst days for DL 323
The latest arrival of the period was on 5 December 2025, 2 hours 44 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 December 2025 | 2 hours 44 minutes | Carrier |
| 25 February 2026 | 1 hour 52 minutes | National Airspace System |
| 26 January 2026 | 1 hour 31 minutes | National Airspace System |
| 20 May 2026 | 1 hour 31 minutes | Carrier |
| 11 July 2026 | 1 hour 31 minutes | Carrier |
Delay causes
Why DL 323 runs late
Carrier accounts for 49% of the 1,486 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 47%National Airspace System
- 4%Extreme weather
- 0%Late-arriving aircraft
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 728 of the 1,486 delay minutes reported here. The split is drawn from 1,486 delay minutes reported on DL 323.
Cancellations run at 2.97%, 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
Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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.
Every one of the 337 flights under DL 323 in the data flew ATL to LGA. 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. 337 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 323
For a booking, the cancellation rate is the figure to plan around on DL 323: 2.97% of its 337 scheduled flights did not operate. A late arrival costs about 50 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.