About 1 in 3 DL 668 flights from New York arrived 15+ minutes late, diverted or cancelled over the past year (30%); 1.9% were cancelled. The typical flight landed 5 minutes early.
DL 668: JFK → SFO
Scheduled to leave New York at 7:00 a.m. local time. Over the past year it arrived on time 70% of the time (359 flights), in line with other DL flights on the route at that hour (70%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 62% |
| Tuesday | 52 | 71% |
| Wednesday | 52 | 81% |
| Thursday | 52 | 73% |
| Friday | 52 | 71% |
| Saturday | 49 | 65% |
| Sunday | 49 | 67% |
Why it was late
All flights JFK → SFO · Connecting off DL 668? Check the risk
DL 668: SFO → JFK
Scheduled to leave San Francisco at 11:50 a.m. local time. Over the past year it arrived on time 71% of the time (346 flights), in line with other DL flights on the route at that hour (68%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 51 | 69% |
| Tuesday | 50 | 72% |
| Wednesday | 50 | 78% |
| Thursday | 49 | 80% |
| Friday | 50 | 68% |
| Saturday | 49 | 65% |
| Sunday | 47 | 62% |
Why it was late
All flights SFO → JFK · Connecting off DL 668? Check the risk
Questions
How often is DL 668 from JFK to SFO late?
Delta Air Lines 668 from New York, NY to San Francisco, CA arrived 15 or more minutes late, was diverted or was cancelled on 30% of 359 scheduled flights between September 2025 and August 2026. 1.9% were cancelled.
How often is DL 668 from SFO to JFK late?
Delta Air Lines 668 from San Francisco, CA to New York, NY arrived 15 or more minutes late, was diverted or was cancelled on 29% of 346 scheduled flights between September 2025 and August 2026. 2.6% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.