Flight number record

DL 667

Delta Air Lines · New York to San Francisco

Route: JFK → SFO
Departs: 19:55
Flights: 360
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 667, check with Delta Air Lines.

DL 667 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 360 flights, with a median arrival 4 minutes late.

The national on-time rate over the same period is 77.6%, so DL 667 runs 16 points behind the country as a whole. Across a thousand flights that is about 158 extra late arrivals.

On time

61.8%

Arrivals under 15 minutes late, of 353 completed flights

Avg delay

73 min

Across delayed arrivals only, not all flights

Cancelled

1.94%

National rate is 1.81%

1 hour+ late

15.6%

National rate is 8.1%

These figures cover 360 flights between July 2025 and June 2026. Beyond the headline rate, 15.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 667 flies

DL 667 flies JFK to SFO without a single fixed slot. Its most common scheduled departure was 19:55, used on 97 of 360 flights, with 19:25 (83 flights) and 19:29 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:5597 flights26.9%
Departs 19:2583 flights23.1%
Departs 19:2936 flights10.0%

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 19:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 667 runs 6 points worse at 61.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 667 next to JFK to SFO

Every carrier on JFK to SFO combined arrived on time 74.1% of the time across 6,730 flights, so DL 667 is 12 points behind it. Delta flew 2,229 flights on the same city pair under all its flight numbers, including this one, and those ran 71.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 20 points.

DL 667 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 667thin sample	360	61.8%	73 min	1.94%	D
All Delta Air Lines on JFK–SFO	2,229	71.3%	70 min	1.48%	C
All carriers on JFK–SFO	6,730	74.1%	71 min	1.92%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 667 quarter by quarter

DL 667 did not run the same all year. Its best quarter was Jul–Sep 2025 at 78.0% on time and its weakest Apr–Jun 2026 at 31.1%, a swing of 47 points on roughly 90 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 202592 flights78.0%
Oct–Dec 202588 flights66.3%
Jan–Mar 202689 flights72.1%
Apr–Jun 202691 flights31.1%

Scale runs 25% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, DL 667 did best on Tuesday at 71.7% on time and worst on Sunday at 54.0%. Each day rests on about 51 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 667 runs late

One category carries most of the weight here. National Airspace System accounts for 48% of the 9,902 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.

National Airspace System
48%
Carrier
37%
Late-arriving aircraft
13%
Extreme weather
2%

48% 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 4,754 minutes out of 9,902, against a national NAS share of 21%. The split is drawn from 9,902 delay minutes reported on DL 667.

Cancellations sit at 1.94% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 15.6% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

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 360 flights under DL 667 in the data flew JFK to SFO. 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. 360 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 667

For a booking, DL 667 is a flight to put a long connection behind. 15.6% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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