Flight profile · Delta Air Lines
DL440
Honolulu (HNL) to Seattle (SEA) · scheduled 10:35 PM – 7:30 AM
How DL440 performs
1,061 operations, July 2023 – July 2026.
DL440 arrived on time 93.4% of the time, against 78.9% for all HNL → SEA flights, so this departure is 14.5 percentage points better than the route as a whole. Against Delta Air Lines’ own flights on this route it is 3.4 points better.
Source: US DOT Bureau of Transportation Statistics · 1,061 operations, July 2023 – July 2026 · If DL440 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How DL440 compares to other flight numbers, not just to itself.
This flight runs unusually far ahead of the HNL → SEA route as a whole, better than 97% of 11,788 comparable flight numbers.
93.4% on time for this specific departure, against 78.9% for every HNL → SEA flight.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where DL440 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 |
|---|---|---|---|---|---|
| DL440 | 93.4% | 0.85% | -16 min | 2.4% | 1,061 |
| Delta Air Lines on HNL → SEA | 90.0% | 0.80% | -14 min | 3.8% | 2,388 |
| All HNL → SEA flights | 78.9% | 1.08% | -5 min | 5.4% | 9,090 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why DL440 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
Share of the delay minutes US DOT attributed to each cause for DL440 on HNL → SEA. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL440 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, DL440 pushed back an average of 16 minutes late; when it came in on time or early, an average of 2 minutes late.
Each departure is matched to the flight the same aircraft flew into HNL just before it, using the tail number in the DOT file, 1,035 of 1,055 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| DL440 | 19% | 24% | 3% |
| Network, same turn | 23% | 40% | 9% |
The schedule leaves a long gap on the ground, which 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 DL440’s aircraft landed 15 or more minutes late is lower than the network’s and, once the aircraft was late, how often DL440 left 15 or more minutes late is lower than the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves HNL late, does that still matter by the time it reaches SEA?
DL440 pushes back an average of 5.6 minutes late and reaches the gate at SEA an average of 8.8 minutes early. The 14.3 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. Its 17.9 minutes on the taxiways at HNL is about what any departure from the airport in that hour spends.
On arrival at SEA, DL440 spends 10.7 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 1.2 minutes shorter than a typical SEA arrival (11.9 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached SEA. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 6,012 departures from HNL scheduled in the clock hour DL440 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SEA (510,187 flights), not just DL440’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves HNL
Part of any flight’s record belongs to the clock rather than to the flight. DL440 has one departure time, so this is what that time is worth.
On-time arrival rate. 6,012 departures from HNL are scheduled in the 10 PM–11 PM hour over the period, against 186,300 across the whole day.
DL440 is scheduled out of HNL at 10:35 PM, in the 10 PM–11 PM bank. Departures from HNL in that hour arrive on time 86.1% of the time against 85.3% across the airport’s whole day, so the hour DL440 leaves in is an ordinary one for HNL and explains nothing about its record either way.
The two airport figures cover every departure from HNL to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does DL440 run worse on particular days?
Wednesday is historically the most reliable day and Saturday the least, a gap of 6.8 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes DL440 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route DL440 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
8 min late
against a median of 16 min early
Percentiles over 1,061 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL440 this flight | Delta Air Lines | 93.4% | 16 min early | 1,061 |
| AS888 | Alaska Airlines | 89.2% | 13 min early | 651 |
| DL359 | Delta Air Lines | 87.0% | 10 min early | 691 |
| AS802 | Alaska Airlines | 84.6% | 10 min early | 660 |
| AS896 | Alaska Airlines | 68.4% | 2 min late | 783 |
| HA22 | Hawaiian Airlines | 61.8% | 8 min late | 847 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL440 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 1,061 records of DL440 operating HNL → SEA, 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 excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
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
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