Flight number record

DL 383

Delta Air Lines · San Francisco to New York

Route: SFO → JFK
Departs: 09:35
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 383, check with Delta Air Lines.

DL 383 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 16 minutes early.

Set against the rest of the country, DL 383's record is 9 points better than the US average of 77.6%. That gap is worth roughly 87 fewer late arrivals for every thousand flights.

On time

86.3%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

84 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

5.0%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 16 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 383 flies

DL 383 flies SFO to JFK without a single fixed slot. Its most common scheduled departure was 09:35, used on 106 of 365 flights, with 09:00 (76 flights) and 09:10 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:35106 flights29.0%
Departs 09:0076 flights20.8%
Departs 09:1047 flights12.9%

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 09:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 383 runs 2 points better at 86.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 383 next to SFO to JFK

Every carrier on SFO to JFK combined arrived on time 80.1% of the time across 6,729 flights, so DL 383 is 6 points ahead of it. Delta flew 2,229 flights on the same city pair under all its flight numbers, including this one, and those ran 79.9% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 5 points.

DL 383 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 383	365	86.3%	84 min	1.37%	A
All Delta Air Lines on SFO–JFK	2,229	79.9%	69 min	1.57%	B
All carriers on SFO–JFK	6,729	80.1%	78 min	1.98%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 383 quarter by quarter

Quarter by quarter DL 383 held fairly steady: 83.3% in Jul–Sep 2025, 90.1% in Oct–Dec 2025, 89.7% in Jan–Mar 2026 and 82.0% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights83.3%
Oct–Dec 202592 flights90.1%
Jan–Mar 202690 flights89.7%
Apr–Jun 202691 flights82.0%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 383 did best on Friday at 94.0% on time and worst on Monday at 78.0%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 383 runs late

One category carries most of the weight here. Carrier accounts for 46% of the 4,104 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
39%
Late-arriving aircraft
10%
Extreme weather
5%

The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,876 of the 4,104 delay minutes reported here. The split is drawn from 4,104 delay minutes reported on DL 383.

Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.82%.

Connections and routes

What a delay on this flight costs

5.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

At 2,586 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 365 flights under DL 383 in the data flew SFO to JFK. 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. 365 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 383

For a booking, DL 383 has one of the better records a US domestic flight can show: 86.3% on time and 1.37% cancelled. That is a base rate, not a promise about any single 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