Flight number record
DL 1636
Delta Air Lines · New York to Tampa
- Route
- JFK → TPA
- Departs
- 19:59
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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, 4 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 364 flights, with a median arrival 10 minutes early.
The national on-time rate over the same period is 77.3%, so DL 1636 runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.
Key figures
On time
73.3%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
2.20%
National rate is 1.89%
1 hour+ late
12.4%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 12.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1636 flies
DL 1636 flies JFK to TPA without a single fixed slot. Its most common scheduled departure was 19:59, used on 66 of 364 flights, with 19:55 (66 flights) and 19:50 (47 flights) next.
- Departs 19:5966 flights18.1%
- Departs 19:5566 flights18.1%
- Departs 19:5047 flights12.9%
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 19:59 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1636 runs 5 points better at 73.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 1636 next to JFK to TPA
Every carrier on JFK to TPA combined arrived on time 76.1% of the time across 2,310 flights, so DL 1636 is 3 points behind it. Delta flew 1,094 flights on the same city pair under all its flight numbers, including this one, and those ran 79.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1636thin sample | 364 | 73.3% | 71 min | 2.20% | C |
| All Delta Air Lines on JFK–TPA | 1,094 | 79.7% | 69 min | 2.74% | B |
| All carriers on JFK–TPA | 2,310 | 76.1% | 76 min | 4.16% | B− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 Jul–Sep 2026 at 60.7%, a swing of 22 points on roughly 73 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 flights76.7%
- Oct–Dec 202591 flights68.5%
- Jan–Mar 202690 flights76.5%
- Apr–Jun 202691 flights82.4%
- Jul–Sep 202662 flights60.7%
Scale runs 50% to 90%.
By weekday, DL 1636 did best on Wednesday at 90.4% on time and worst on Sunday at 56.2%. Each day rests on about 52 flights, so a gap of 34 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1636 runs when it is late
DL 1636 often beats the schedule: 156 of 356 completed flights, 44%, arrived 15 minutes or more early. The 95 late arrivals split 28 under half an hour, 23 between 30 and 60 minutes, and 44 an hour or more.
- 15+ min early156 flights43.8%
- Within 15 min105 flights29.5%
- 15–29 min late28 flights7.9%
- 30–59 min late23 flights6.5%
- 1–2 hours late28 flights7.9%
- 2+ hours late16 flights4.5%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
21 of 93 late departures made up the time and arrived on time, 23% of them. In the other direction, 23 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at TPA.
The worst days
Worst days for DL 1636
The latest arrival of the period was on 30 October 2025, 6 hours 3 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 October 2025 | 6 hours 3 minutes | Late-arriving aircraft |
| 26 January 2026 | 3 hours 53 minutes | Carrier |
| 6 July 2026 | 3 hours 53 minutes | Late-arriving aircraft |
| 6 September 2025 | 3 hours 15 minutes | Late-arriving aircraft |
| 8 November 2025 | 3 hours 11 minutes | Late-arriving aircraft |
Delay causes
Why DL 1636 runs late
Late-arriving aircraft accounts for 49% of the 6,779 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 24%National Airspace System
- 24%Carrier
- 2%Extreme weather
- 1%Security
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,779 reported delay minutes here, that single category outweighs weather by 32 to one. The split is drawn from 6,779 delay minutes reported on DL 1636.
Cancellations sit at 2.20% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
12.4% 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 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.
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, DL 1636 is a flight to put a long connection behind. 12.4% 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
- JFK to TPA, every carrier and departure
- TPA to JFK, the return direction
- Delta Air Lines 2042 on the same route87.7%
- JetBlue Airways 225 on the same route81.0%
- JetBlue Airways 2725 on the same route77.2%
- Delta Air Lines 2093 on the same route78.0%
- John F. Kennedy International (JFK) delay statistics
- Tampa International (TPA) 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
- Why the first flight of the morning is statistically safest
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.