Flight number record
DL 667
Delta Air Lines · New York to San Francisco
- Route
- JFK → SFO
- Departs
- 19:25
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 667, check with Delta Air Lines.
DL 667 earns a D−, which is as low as this site's scale goes for a reason. Only 55.7% of flights arrive inside the 15-minute window, 22 points worse than the national rate of 77.3%. Late arrivals average about an hour. Treat any tight connection here as a coin flip. That rests on 358 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so DL 667 runs 22 points behind the country as a whole. Across a thousand flights that is about 216 extra late arrivals.
Key figures
On time
55.7%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
3.63%
National rate is 1.89%
1 hour+ late
16.8%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. Beyond the headline rate, 16.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 667 flies
DL 667 flies JFK to SFO without a single fixed slot. Its most common scheduled departure was 19:25, used on 83 of 358 flights, with 19:29 (36 flights) next.
- Departs 19:2583 flights23.2%
- Departs 19:2936 flights10.1%
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 19:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 667 runs 12 points worse at 55.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 667 next to JFK to SFO
Every carrier on JFK to SFO combined arrived on time 71.4% of the time across 6,800 flights, so DL 667 is 16 points behind it. Delta flew 2,231 flights on the same city pair under all its flight numbers, including this one, and those ran 67.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 25 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 667thin sample | 358 | 55.7% | 66 min | 3.63% | D− |
| All Delta Air Lines on JFK–SFO | 2,231 | 67.3% | 70 min | 2.20% | C |
| All carriers on JFK–SFO | 6,800 | 71.4% | 69 min | 2.57% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 86.7% on time and its weakest Apr–Jun 2026 at 31.1%, a swing of 56 points on roughly 72 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 202588 flights66.3%
- Jan–Mar 202689 flights72.1%
- Apr–Jun 202691 flights31.1%
- Jul–Sep 202660 flights35.8%
Scale runs 25% to 90%.
By weekday, DL 667 did best on Tuesday at 68.0% on time and worst on Saturday at 47.9%. Each day rests on about 51 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 667 runs when it is late
The 153 late arrivals split 41 under half an hour, 54 between 30 and 60 minutes, and 58 an hour or more.
- 15+ min early63 flights18.3%
- Within 15 min129 flights37.4%
- 15–29 min late41 flights11.9%
- 30–59 min late54 flights15.7%
- 1–2 hours late37 flights10.7%
- 2+ hours late21 flights6.1%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
14 of 106 late departures made up the time and arrived on time, 13% of them. In the other direction, 61 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 SFO.
The worst days
Worst days for DL 667
The latest arrival of the period was on 30 October 2025, 13 hours 6 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 October 2025 | 13 hours 6 minutes | Carrier |
| 11 July 2026 | 3 hours 55 minutes | Carrier |
| 21 December 2025 | 3 hours 38 minutes | Carrier |
| 30 May 2026 | 3 hours 21 minutes | Carrier |
| 15 July 2026 | 3 hours 3 minutes | Late-arriving aircraft |
Delay causes
Why DL 667 runs late
National Airspace System accounts for 49% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%National Airspace System
- 34%Carrier
- 15%Late-arriving aircraft
- 2%Extreme weather
49% 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 4,980 minutes out of 10,000, against a national NAS share of 21%. The split is drawn from 10,137 delay minutes reported on DL 667.
Cancellations run at 3.63%, against 1.89% nationally. That is roughly one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
16.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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 358 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. 358 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, the cancellation rate is the figure to plan around on DL 667: 3.63% of its 358 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- JFK to SFO, every carrier and departure
- SFO to JFK, the return direction
- American Airlines 179 on the same route79.8%
- American Airlines 177 on the same route60.4%
- Delta Air Lines 668 on the same route71.8%
- American Airlines 15 on the same route73.7%
- JetBlue Airways 115 on the same route80.9%
- Delta Air Lines 679 on the same route72.7%
- John F. Kennedy International (JFK) delay statistics
- San Francisco International (SFO) 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.