Flight profile · Delta Air Lines
DL636
New York (JFK) to Honolulu (HNL) · scheduled 10:00 AM – 3:21 PM
How DL636 performs
606 operations, September 2024 – August 2026.
Between its first and last recorded date on JFK → HNL, DL636 averaged about 6 operations a week (606 in 722 days, cancelled ones included).
DL636 arrived on time 80.2% of the time, against 74.0% for all JFK → HNL flights, so this departure is 6.2 percentage points better than the route as a whole. Against Delta Air Lines’ own flights on this route it is 1.7 points worse.
Source: US DOT Bureau of Transportation Statistics · 606 operations, September 2024 – August 2026 · If DL636 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL636 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL636 | 80.2% | 1.16% | -8 min | 5.0% | 606 |
| Delta Air Lines on JFK → HNL | 81.9% | 0.80% | -10 min | 4.8% | 1,005 |
| All JFK → HNL flights | 74.0% | 1.24% | -3 min | 6.6% | 2,170 |
DL636 cancelled 7 of 606 operations (1.16%), close to the 1.24% for JFK → HNL.
5.0% of DL636’s arrivals were an hour or more late, against 6.6% across JFK → HNL, so the long delays are less common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · September 2024 – August 2026
Why DL636 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL636 on JFK → HNL. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering September 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies DL636 comes in late, and what that does to the departure.
The aircraft flying DL636 came in 15 or more minutes late on 15% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Matched by tail number to the aircraft’s previous flight into JFK: 445 of 601 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| DL636 | 15% |
| Network, same turn | 23% |
A long gap on the ground gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 90 minutes to 3 hours. How often DL636’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2024 – August 2026
From pushback to gate
When it leaves JFK late, does that still matter by the time it reaches HNL?
DL636 pushes back an average of 7.9 minutes late and reaches the gate at HNL an average of 0.7 minutes early. The 8.6 minutes between those two figures are slack the published schedule already carries, so on average a late pushback on this flight is made up before the gate. It spends 28.6 minutes on the taxiways at JFK, 5.1 minutes longer than a typical JFK departure in the same hour.
On arrival at HNL, DL636 spends 8.6 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at HNL spends on the ground before reaching the gate.
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 12,290 JFK departures. Taxi-in is landing to gate, set against 191,221 arrivals at HNL. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · September 2024 – August 2026
The hour it leaves JFK
DL636 has one departure time, 10:00 AM, so this is what that hour at JFK is worth.
On-time arrival rate. 12,290 departures from JFK are scheduled in the 10 AM–11 AM hour over the period, against 360,775 across the whole day.
DL636 is scheduled out of JFK at 10:00 AM, in the 10 AM–11 AM bank. Departures from JFK in that hour arrive on time 80.2% of the time against 76.7% across the airport’s whole day — the slot alone is worth 3.5 points better before anything about this particular flight is considered.
Both airport figures cover every destination from JFK, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · September 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes DL636 has flown
Carriers reassign flight numbers. DL636 also served these 8 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DTW→LAX Detroit to Los Angeles | September 10, 2024 – October 2, 2024 | 8 | — |
| JFK→LAX New York to Los Angeles | July 8, 2024 – September 8, 2024 | 54 | — |
| LGA→DFW New York to Dallas–Fort Worth | July 2, 2023 – June 6, 2024 | 185 | 65.9% |
| ATL→SEA Atlanta to Seattle | March 10, 2024 – May 6, 2024 | 58 | — |
| PHL→DTW Philadelphia to Detroit | February 8–15, 2024 | 5 | — |
| DTW→PHL Detroit to Philadelphia | February 8–15, 2024 | 4 | — |
| LGA→DTW New York to Detroit | October 14, 2023 – November 4, 2023 | 3 | — |
| ATL→DCA Atlanta to Washington | July 8, 2023 | 1 | — |
The figures above describe only JFK → HNL, the route DL636 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
34 min late
against a median of 8 min early
Percentiles over 606 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL636 this flight | Delta Air Lines | 80.2% | 8 min early | 606 |
| HA51 | Hawaiian Airlines | 69.9% | 1 min late | 848 |
Among all 2 departures on this route with at least 600 operations, DL636 has the highest on-time rate. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 606 records of DL636 operating JFK → HNL, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule; cancelled and diverted flights are reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed