Flight number record
DL 2378
Delta Air Lines · Atlanta to New York
- Route
- ATL → JFK
- Departs
- 16:59
- Flights
- 255
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2378, check with Delta Air Lines.
DL 2378 draws a C. About 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 255 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so DL 2378 runs 10 points behind the country as a whole. Across a thousand flights that is about 100 extra late arrivals.
Key figures
On time
67.3%
Arrivals under 15 minutes late, of 248 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.57%
National rate is 1.89%
1 hour+ late
13.3%
National rate is 8.3%
These figures cover 255 flights between September 2025 and August 2026. Beyond the headline rate, 13.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2378 flies
DL 2378 flies ATL to JFK without a single fixed slot. Its most common scheduled departure was 16:59, used on 51 of 255 flights, with 19:59 (39 flights) and 19:40 (34 flights) next.
- Departs 16:5951 flights20.0%
- Departs 19:5939 flights15.3%
- Departs 19:4034 flights13.3%
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 16:59 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2378 runs 5 points worse at 67.3%. 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 2378 next to ATL to JFK
Every carrier on ATL to JFK combined arrived on time 74.6% of the time across 4,218 flights, so DL 2378 is 7 points behind it. Delta flew 2,445 flights on the same city pair under all its flight numbers, including this one, and those ran 78.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2378thin sample | 255 | 67.3% | 73 min | 1.57% | C |
| All Delta Air Lines on ATL–JFK | 2,445 | 78.4% | 73 min | 1.55% | B |
| All carriers on ATL–JFK | 4,218 | 74.6% | 81 min | 2.80% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2378 quarter by quarter
DL 2378 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 52.7%, a swing of 34 points on roughly 64 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 flights86.7%
- Oct–Dec 202592 flights64.0%
- Jan–Mar 20264 flights—
- Apr–Jun 202671 flights75.7%
- Jul–Sep 202658 flights52.7%
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2378 did best on Wednesday at 81.1% on time and worst on Sunday at 62.2%. Each day rests on about 36 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2378 runs when it is late
DL 2378 often beats the schedule: 73 of 248 completed flights, 29%, arrived 15 minutes or more early. The 81 late arrivals split 22 under half an hour, 26 between 30 and 60 minutes, and 33 an hour or more.
- 15+ min early73 flights29.4%
- Within 15 min94 flights37.9%
- 15–29 min late22 flights8.9%
- 30–59 min late26 flights10.5%
- 1–2 hours late21 flights8.5%
- 2+ hours late12 flights4.8%
Scale runs 0% to 100%.
Share of 248 completed flights by arrival against schedule.
18 of 89 late departures made up the time and arrived on time, 20% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for DL 2378
The latest arrival of the period was on 17 November 2025, 5 hours 39 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 November 2025 | 5 hours 39 minutes | Carrier |
| 8 November 2025 | 5 hours 24 minutes | National Airspace System |
| 7 August 2026 | 4 hours 41 minutes | National Airspace System |
| 26 May 2026 | 3 hours 44 minutes | Carrier |
| 27 August 2026 | 3 hours 35 minutes | National Airspace System |
Delay causes
Why DL 2378 runs late
Carrier accounts for 44% of the 5,914 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 39%National Airspace System
- 10%Late-arriving aircraft
- 4%Extreme weather
- 2%Security
39% 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 2,321 minutes out of 5,914, against a national NAS share of 21%. The split is drawn from 5,914 delay minutes reported on DL 2378.
Cancellations sit at 1.57% against a national 1.89%, which is ordinary. Diversions add another 1.18%.
Connections and routes
What a delay on this flight costs
13.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 760 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 one other city pair in the data, including MIA to LGA (36), but none flew often enough under DL 2378 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to JFK only.
One caution: this is a thin sample. 255 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 2378
For a booking, DL 2378 is a flight to put a long connection behind. 13.3% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- ATL to JFK, every carrier and departure
- JFK to ATL, the return direction
- Delta Air Lines 2398 on the same route72.8%
- Delta Air Lines 2380 on the same route80.7%
- Delta Air Lines 2420 on the same route89.3%
- Frontier Airlines 4732 on the same route73.3%
- Delta Air Lines 1034 on the same route89.2%
- JetBlue Airways 320 on the same route83.8%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- John F. Kennedy International (JFK) 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
- How often a connection fails at the major US hubs
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.