Flight number record
DL 917
Delta Air Lines · New York to Salt Lake City
- Route
- JFK → SLC
- Departs
- 11:10
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 917, check with Delta Air Lines.
DL 917 lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That rests on 364 flights, with a median arrival 6 minutes early.
Key figures
On time
79.8%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 364 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 917 flies
DL 917 flies JFK to SLC without a single fixed slot. Its most common scheduled departure was 11:10, used on 61 of 364 flights, with 10:00 (55 flights) next.
- Departs 11:1061 flights16.8%
- Departs 10:0055 flights15.1%
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 11:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 917 runs level with that at 79.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 917 next to JFK to SLC
Every carrier on JFK to SLC combined arrived on time 76.4% of the time across 1,929 flights, so DL 917 is 3 points ahead of it. Delta flew 1,536 flights on the same city pair under all its flight numbers, including this one, and those ran 78.6% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 917thin sample | 364 | 79.8% | 52 min | 1.92% | B |
| All Delta Air Lines on JFK–SLC | 1,536 | 78.6% | 66 min | 1.95% | B |
| All carriers on JFK–SLC | 1,929 | 76.4% | 65 min | 2.44% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 917 quarter by quarter
DL 917 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 58.3%, a swing of 28 points on roughly 73 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 202530 flights86.7%
- Oct–Dec 202591 flights82.2%
- Jan–Mar 202690 flights85.9%
- Apr–Jun 202691 flights83.5%
- Jul–Sep 202662 flights58.3%
Scale runs 50% to 90%.
By weekday, DL 917 ranged from 76.0% on Sunday to 86.3% on Friday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 917 runs when it is late
DL 917 often beats the schedule: 99 of 356 completed flights, 28%, arrived 15 minutes or more early. The 72 late arrivals split 35 under half an hour, 21 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early99 flights27.8%
- Within 15 min185 flights52.0%
- 15–29 min late35 flights9.8%
- 30–59 min late21 flights5.9%
- 1–2 hours late11 flights3.1%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
17 of 62 late departures made up the time and arrived on time, 27% of them. In the other direction, 27 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 SLC.
The worst days
Worst days for DL 917
The latest arrival of the period was on 16 December 2025, 8 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, February, July and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 December 2025 | 8 hours 15 minutes | Carrier |
| 1 February 2026 | 4 hours 35 minutes | Late-arriving aircraft |
| 18 July 2026 | 4 hours 34 minutes | Carrier |
| 5 August 2026 | 2 hours 36 minutes | Late-arriving aircraft |
| 25 February 2026 | 2 hours 3 minutes | Extreme weather |
Delay causes
Why DL 917 runs late
Carrier accounts for 43% of the 3,771 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 32%National Airspace System
- 20%Late-arriving aircraft
- 4%Extreme weather
32% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,223 minutes out of 3,771, against a national NAS share of 21%. The split is drawn from 3,771 delay minutes reported on DL 917.
Cancellations sit at 1.92% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
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 8.3% 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 1,990 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 364 flights under DL 917 in the data flew JFK to SLC. 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. 364 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 917
For a booking, read DL 917 as 79.8% on time with 1.92% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- JFK to SLC, every carrier and departure
- SLC to JFK, the return direction
- Delta Air Lines 887 on the same route76.8%
- Delta Air Lines 892 on the same route87.1%
- Delta Air Lines 863 on the same route70.2%
- JetBlue Airways 71 on the same route69.6%
- John F. Kennedy International (JFK) delay statistics
- Salt Lake City International (SLC) 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
- The best time of day to fly, according to 7.05 million flight records
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.