Flight profile · Delta Air Lines
DL917
New York (JFK) to Salt Lake City (SLC) · scheduled 11:00 AM – 2:40 PM
How DL917 performs
845 operations, January 2024 – July 2026.
DL917 arrived on time 83.7% of the time, against 79.9% for all JFK → SLC flights, so this departure is 3.8 percentage points better than the route as a whole.
Source: US DOT Bureau of Transportation Statistics · 845 operations, January 2024 – July 2026 · If DL917 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL917 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 |
|---|---|---|---|---|---|
| DL917 | 83.7% | 1.18% | -10 min | 3.4% | 845 |
| 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 DL917 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 DL917 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 DL917 comes in late, and what that does to the departure.
The aircraft flying DL917 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, 238 of 835 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 |
|---|---|
| DL917 | 16% |
| Network, same turn | 23% |
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 DL917’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.
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?
DL917 pushes back an average of 4.7 minutes late and reaches the gate at SLC an average of 4.1 minutes early. The 8.8 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 25.7 minutes on the taxiways at JFK, 2.5 minutes longer than a typical JFK departure in the same hour.
On arrival at SLC, DL917 spends 7.1 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 23,754 departures from JFK scheduled in the clock hour DL917 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 DL917’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. DL917 has one departure time, so this is what that time is worth.
On-time arrival rate. 23,754 departures from JFK are scheduled in the 11 AM–12 PM hour over the period, against 351,635 across the whole day.
DL917 is scheduled out of JFK at 11:00 AM, in the 11 AM–12 PM bank. Departures from JFK in that hour arrive on time 82.2% of the time against 77.0% across the airport’s whole day — the slot alone is worth 5.2 points better 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.
By day of week
Does DL917 run worse on particular days?
Monday is historically the most reliable day and Saturday the least, a gap of 13.8 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes DL917 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 |
|---|---|---|---|
| RDU→BOS Raleigh–Durham to Boston | May 7, 2024 – June 6, 2024 | 23 | — |
| LAX→ATL Los Angeles to Atlanta | April 11, 2024 – May 6, 2024 | 16 | — |
| DFW→ATL Dallas–Fort Worth to Atlanta | March 10, 2024 – April 8, 2024 | 30 | — |
| EWR→SLC Newark to Salt Lake City | September 5, 2023 – January 7, 2024 | 125 | 88.0% |
| SLC→BNA Salt Lake City to Nashville | July 10, 2023 – September 4, 2023 | 57 | — |
| GPT→ATL Gulfport to Atlanta | July 1–9, 2023 | 9 | — |
Because the same number has served different journeys, the statistics above describe only the route DL917 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.
24 min late
against a median of 10 min early
Percentiles over 845 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 this flight | Delta Air Lines | 83.7% | 10 min early | 845 |
| DL887 | Delta Air Lines | 81.2% | 13 min early | 784 |
| DL863 | 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. DL917 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 845 records of DL917 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
Analysis last recomputed