Flight number record
DL 636
Delta Air Lines · New York to Honolulu
- Route
- JFK → HNL
- Departs
- 10:00
- Flights
- 297
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 636, check with Delta Air Lines.
DL 636 lands a B, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 297 flights, with a median arrival 6 minutes early.
Key figures
On time
76.7%
Arrivals under 15 minutes late, of 287 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
2.36%
National rate is 1.89%
1 hour+ late
4.9%
National rate is 8.3%
These figures cover 297 flights between September 2025 and August 2026. The median arrival is 6 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When DL 636 flies
DL 636 flies JFK to HNL without a single fixed slot. Its most common scheduled departure was 10:00, used on 101 of 297 flights, with 10:30 (81 flights) and 09:55 (66 flights) next.
- Departs 10:00101 flights34.0%
- Departs 10:3081 flights27.3%
- Departs 09:5566 flights22.2%
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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 636 runs 7 points worse at 76.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 636 next to JFK to HNL
Every carrier on JFK to HNL combined arrived on time 68.4% of the time across 666 flights, so DL 636 is 8 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 636thin sample | 297 | 76.7% | 59 min | 2.36% | B |
| All Delta Air Lines on JFK–HNLthin sample | 297 | 76.7% | 59 min | 2.36% | B |
| All carriers on JFK–HNL | 666 | 68.4% | 72 min | 3.15% | C− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 636 quarter by quarter
DL 636 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.2% on time and its weakest Jan–Mar 2026 at 63.5%, a swing of 19 points on roughly 74 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 202521 flights—
- Oct–Dec 202557 flights73.2%
- Jan–Mar 202666 flights63.5%
- Apr–Jun 202691 flights82.2%
- Jul–Sep 202662 flights79.3%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 636 did best on Tuesday at 90.3% on time and worst on Sunday at 69.8%. Each day rests on about 42 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 636 runs when it is late
DL 636 often beats the schedule: 110 of 287 completed flights, 38%, arrived 15 minutes or more early. The 67 late arrivals split 33 under half an hour, 20 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early110 flights38.3%
- Within 15 min110 flights38.3%
- 15–29 min late33 flights11.5%
- 30–59 min late20 flights7.0%
- 1–2 hours late7 flights2.4%
- 2+ hours late7 flights2.4%
Scale runs 0% to 100%.
Share of 287 completed flights by arrival against schedule.
8 of 33 late departures made up the time and arrived on time, 24% of them. In the other direction, 42 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 HNL.
The worst days
Worst days for DL 636
The latest arrival of the period was on 25 October 2025, 10 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 October 2025 | 10 hours 15 minutes | Carrier |
| 19 December 2025 | 7 hours 10 minutes | Carrier |
| 27 December 2025 | 2 hours 43 minutes | Extreme weather |
| 5 July 2026 | 2 hours 37 minutes | Carrier |
| 5 August 2026 | 2 hours 36 minutes | Carrier |
Delay causes
Why DL 636 runs late
Carrier accounts for 54% of the 3,926 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 35%National Airspace System
- 8%Extreme weather
- 3%Late-arriving aircraft
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,124 of the 3,926 delay minutes reported here. The split is drawn from 3,926 delay minutes reported on DL 636.
Cancellations sit at 2.36% against a national 1.89%, which is ordinary. Diversions add another 1.01%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.9% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 4,983 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 297 flights under DL 636 in the data flew JFK to HNL. 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. 297 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 636
For a booking, read DL 636 as 76.7% on time with 2.36% cancelled over 297 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- John F. Kennedy International (JFK) delay statistics
- Daniel K. Inouye International (HNL) 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
- Worst months to fly in the US, ranked by the data
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.