Flight number record

DL 1636

Delta Air Lines · New York to Tampa

Route: JFK → TPA
Departs: 19:10
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1636, check with Delta Air Lines.

DL 1636 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 77.6%. The late ones land a little over an hour behind schedule. That rests on 364 flights, with a median arrival 12 minutes early.

On time

74.9%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

2.47%

National rate is 1.81%

1 hour+ late

11.5%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 11.5% 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 1636 flies

DL 1636 flies JFK to TPA without a single fixed slot. Its most common scheduled departure was 19:10, used on 87 of 364 flights, with 19:59 (60 flights) and 19:50 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:1087 flights23.9%
Departs 19:5960 flights16.5%
Departs 19:5047 flights12.9%

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 19:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 1636 runs 7 points better at 74.9%. 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 1636 next to JFK to TPA

Every carrier on JFK to TPA combined arrived on time 77.1% of the time across 2,301 flights, so DL 1636 is 2 points behind it. Delta flew 1,094 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 7 points.

DL 1636 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1636thin sample	364	74.9%	79 min	2.47%	C
All Delta Air Lines on JFK–TPA	1,094	79.6%	76 min	2.65%	B
All carriers on JFK–TPA	2,301	77.1%	75 min	3.09%	B−
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1636 quarter by quarter

DL 1636 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.4% on time and its weakest Oct–Dec 2025 at 68.5%, a swing of 14 points on roughly 91 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 flights72.2%
Oct–Dec 202591 flights68.5%
Jan–Mar 202690 flights76.5%
Apr–Jun 202691 flights82.4%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1636 did best on Wednesday at 86.5% on time and worst on Sunday at 60.4%. Each day rests on about 52 flights, so a gap of 26 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1636 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 7,065 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.

Late-arriving aircraft
47%
National Airspace System
28%
Carrier
23%
Extreme weather
1%

47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,065 reported delay minutes here, that single category outweighs weather by 32 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,065 delay minutes reported on DL 1636.

Cancellations sit at 2.47% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

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. 11.5% 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 1,005 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.

Every one of the 364 flights under DL 1636 in the data flew JFK to TPA. 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. 364 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 1636

For a booking, read DL 1636 as 74.9% on time with 2.47% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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