Flight profile · Delta Air Lines
DL863
New York (JFK) to Salt Lake City (SLC) · scheduled 6:40 PM – 10:15 PM
How DL863 performs
800 operations, January 2024 – July 2026.
DL863 arrived on time 71.3% of the time, against 79.9% for all JFK → SLC flights, so this departure is 8.6 percentage points worse than the route as a whole. Against Delta Air Lines’ own flights on this route it is 12.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 800 operations, January 2024 – July 2026 · If DL863 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 DL863 compares to other flight numbers, not just to itself.
This flight runs unusually far behind the carrier's own average on this route, worse than 92% of 11,589 comparable flight numbers.
71.3% on time for this specific departure, against 83.4% for the same carrier's other flights on this route.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – 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 DL863 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 |
|---|---|---|---|---|---|
| DL863 | 71.3% | 1.38% | -7 min | 9.9% | 800 |
| Delta Air Lines on JFK → SLC | 83.4% | 0.94% | -13 min | 5.3% | 4,677 |
| All JFK → SLC flights | 79.9% | 1.22% | -11 min | 7.1% | 6,059 |
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – July 2026
Why DL863 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for DL863 on JFK → SLC. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL863 comes in late, and what that does to the departure.
The aircraft flying DL863 came in 15 or more minutes late on 16% 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.
Each departure is matched to the flight the same aircraft flew into JFK just before it, using the tail number in the DOT file, 584 of 789 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 |
|---|---|
| DL863 | 16% |
| Network, same turn | 17% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often DL863’s aircraft landed 15 or more minutes late is about the same as the network’s. There are not enough departures in both groups to compare how it left.
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 January 2024 – July 2026
From pushback to gate
When it leaves JFK late, does that still matter by the time it reaches SLC?
DL863 pushes back an average of 16.3 minutes late and reaches the gate at SLC an average of 5.5 minutes late. The 10.8 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. It spends 37.2 minutes on the taxiways at JFK, 4.2 minutes longer than a typical JFK departure in the same hour.
On arrival at SLC, DL863 spends 6.9 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 SLC spends on the ground before reaching the gate.
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 SLC. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 18,053 departures from JFK scheduled in the clock hour DL863 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SLC (355,118 flights), not just DL863’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – July 2026
The hour it leaves JFK
Part of any flight’s record belongs to the clock rather than to the flight. DL863 has one departure time, so this is what that time is worth.
On-time arrival rate. 18,053 departures from JFK are scheduled in the 6 PM–7 PM hour over the period, against 351,635 across the whole day.
DL863 is scheduled out of JFK at 6:40 PM, in the 6 PM–7 PM bank. Departures from JFK in that hour arrive on time 67.9% of the time against 77.0% across the airport’s whole day — the slot alone is worth 9.2 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from JFK 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 · January 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes DL863 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.
| Route | Operated | Flights | On time |
|---|---|---|---|
| OGG→SLC Kahului to Salt Lake City | December 19, 2025 – January 4, 2026 | 17 | — |
| CHA→ATL Chattanooga to Atlanta | January 6, 2025 – February 11, 2025 | 27 | — |
| JFK→PHX New York to Phoenix | May 9, 2024 – June 6, 2024 | 17 | — |
| STL→MSP St. Louis to Minneapolis | April 9, 2024 – May 6, 2024 | 28 | — |
| JFK→LAS New York to Las Vegas | September 5, 2023 – January 7, 2024 | 116 | 87.0% |
| PDX→ATL Portland to Atlanta | July 1, 2023 – September 4, 2023 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route DL863 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.
59 min late
against a median of 7 min early
DL863 has an average that understates its risk: a typical arrival is 7 min early, but the worst tenth are 66 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 800 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL892 | Delta Air Lines | 89.4% | 15 min early | 877 |
| DL917 | Delta Air Lines | 83.7% | 10 min early | 845 |
| DL887 | Delta Air Lines | 81.2% | 13 min early | 784 |
| DL863 this flight | Delta Air Lines | 71.3% | 7 min early | 800 |
| B671 | JetBlue | 67.1% | 2 min early | 979 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL863 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 800 records of DL863 operating JFK → SLC, 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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