Flight number record

DL 636

Delta Air Lines · New York to Honolulu

Route: JFK → HNL
Departs: 10:00
Flights: 297
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 297 flights, with a median arrival 5 minutes early.

On time

77.0%

Arrivals under 15 minutes late, of 291 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

1.35%

National rate is 1.81%

1 hour+ late

4.5%

National rate is 8.1%

These figures cover 297 flights between July 2025 and June 2026. The median arrival is 5 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.

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 09:55 (67 flights) and 09:00 (61 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:00101 flights34.0%
Departs 09:5567 flights22.6%
Departs 09:0061 flights20.5%

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 10:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 636 runs 7 points worse at 77.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 636 next to JFK to HNL

Every carrier on JFK to HNL combined arrived on time 69.8% of the time across 667 flights, so DL 636 is 7 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 5 points.

DL 636 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 636thin sample	297	77.0%	57 min	1.35%	B
All Delta Air Lines on JFK–HNLthin sample	297	77.0%	57 min	1.35%	B
All carriers on JFK–HNL	667	69.8%	69 min	2.40%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 636 quarter by quarter

DL 636 did not run the same all year. Its best quarter was Jul–Sep 2025 at 84.1% on time and its weakest Jan–Mar 2026 at 63.5%, a swing of 21 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 202583 flights84.1%
Oct–Dec 202557 flights73.2%
Jan–Mar 202666 flights63.5%
Apr–Jun 202691 flights82.2%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 636 did best on Monday at 88.4% on time and worst on Sunday at 65.1%. Each day rests on about 42 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 636 runs late

One category carries most of the weight here. Carrier accounts for 46% of the 3,805 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.

Carrier
46%
National Airspace System
34%
Late-arriving aircraft
13%
Extreme weather
7%

The largest share of delay minutes, 46%, 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 1,740 of the 3,805 delay minutes reported here. The split is drawn from 3,805 delay minutes reported on DL 636.

Cancellations sit at 1.35% against a national 1.81%, which is ordinary. Diversions add another 0.67%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.5% land an hour or more behind schedule, against 8.1% 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 77.0% on time with 1.35% cancelled over 297 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