Flight number record

DL 2378

Delta Air Lines · Atlanta to New York

Route: ATL → JFK
Departs: 19:40
Flights: 259
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2378, check with Delta Air Lines.

DL 2378 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 259 flights, with a median arrival 5 minutes early.

The national on-time rate over the same period is 77.6%, so DL 2378 runs 9 points behind the country as a whole. Across a thousand flights that is about 92 extra late arrivals.

On time

68.4%

Arrivals under 15 minutes late, of 253 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

1.93%

National rate is 1.81%

1 hour+ late

13.0%

National rate is 8.1%

These figures cover 259 flights between July 2025 and June 2026. Beyond the headline rate, 13.0% 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 2378 flies

DL 2378 flies ATL to JFK without a single fixed slot. Its most common scheduled departure was 19:40, used on 75 of 259 flights, with 19:59 (39 flights) and 19:45 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:4075 flights29.0%
Departs 19:5939 flights15.1%
Departs 19:4531 flights12.0%

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 19:40 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 2378 runs level with that at 68.4%. 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 2378 next to ATL to JFK

Every carrier on ATL to JFK combined arrived on time 75.3% of the time across 4,263 flights, so DL 2378 is 7 points behind it. Delta flew 2,448 flights on the same city pair under all its flight numbers, including this one, and those ran 79.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 13 points.

DL 2378 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2378thin sample	259	68.4%	76 min	1.93%	C
All Delta Air Lines on ATL–JFK	2,448	79.7%	75 min	1.51%	B
All carriers on ATL–JFK	4,263	75.3%	83 min	2.35%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2378 quarter by quarter

DL 2378 did not run the same all year. Its best quarter was Apr–Jun 2026 at 75.7% on time and its weakest Oct–Dec 2025 at 64.0%, a swing of 12 points on roughly 86 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 202592 flights67.8%
Oct–Dec 202592 flights64.0%
Jan–Mar 20264 flights—
Apr–Jun 202671 flights75.7%

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2378 ranged from 62.2% on Sunday to 72.2% on Wednesday. With about 37 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 2378 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 6,069 reported delay minutes.

Carrier
42%
National Airspace System
32%
Late-arriving aircraft
15%
Extreme weather
9%
Security
2%

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 2,531 of the 6,069 delay minutes reported here. The split is drawn from 6,069 delay minutes reported on DL 2378.

Cancellations sit at 1.93% against a national 1.81%, which is ordinary. Diversions add another 0.39%.

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. 13.0% 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 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. 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 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. 259 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. 13.0% 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.

Where to go next

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.

Key figures