Flight number record

DL 917

Delta Air Lines · New York to Salt Lake City

Route: JFK → SLC
Departs: 11:25
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 917, check with Delta Air Lines.

DL 917 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 55 minutes. That rests on 364 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 917's record is 7 points better than the US average of 77.6%. That gap is worth roughly 70 fewer late arrivals for every thousand flights.

On time

84.6%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

3.4%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 8 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 917 flies

DL 917 flies JFK to SLC without a single fixed slot. Its most common scheduled departure was 11:25, used on 97 of 364 flights, with 10:00 (55 flights) and 11:10 (55 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:2597 flights26.6%
Departs 10:0055 flights15.1%
Departs 11:1055 flights15.1%

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 11:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 917 runs 6 points better at 84.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 917 next to JFK to SLC

Every carrier on JFK to SLC combined arrived on time 78.4% of the time across 1,928 flights, so DL 917 is 6 points ahead of it. Delta flew 1,535 flights on the same city pair under all its flight numbers, including this one, and those ran 80.8% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 3 points.

DL 917 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 917thin sample	364	84.6%	54 min	1.37%	B
All Delta Air Lines on JFK–SLC	1,535	80.8%	64 min	1.63%	B
All carriers on JFK–SLC	1,928	78.4%	65 min	1.82%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 917 quarter by quarter

Quarter by quarter DL 917 held fairly steady: 87.0% in Jul–Sep 2025, 82.2% in Oct–Dec 2025, 85.9% in Jan–Mar 2026 and 83.5% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights87.0%
Oct–Dec 202591 flights82.2%
Jan–Mar 202690 flights85.9%
Apr–Jun 202691 flights83.5%

Scale runs 75% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 917 ranged from 80.4% on Thursday to 86.5% on Tuesday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 917 runs late

One category carries most of the weight here. Carrier accounts for 46% of the 2,988 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
14%
Extreme weather
6%

34% 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 1,022 minutes out of 2,988, against a national NAS share of 21%. The split is drawn from 2,988 delay minutes reported on DL 917.

Cancellations sit at 1.37% against a national 1.81%, 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 3.4% 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 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 84.6% on time with 1.37% cancelled over 364 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