Flight Reliability
DL 667 · Delta Air Lines
New York → San Francisco (JFK–SFO)
62
A Little Dicey
WanderNerd Reliability Score
- 66%
- Arrive within 15 minutes
- 19 min
- Average arrival delay
- 1.9%
- Cancelled
- 1 min
- Median arrival delay
Based on 360 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 667 arrived on time 77% of the time on Tuesdays and just 59% on Sundays. That gap is worth planning around.
Lagging the JFK–SFO route.
DL 667 arrived on time 66% of the time, versus 76% across the JFK–SFO route.
Well behind the Delta Air Lines network.
DL 667 arrived on time 66% of the time, versus 81% across the Delta Air Lines network.
Recent months have been rougher.
DL 667 arrived on time 47% of the time over the last three months in the data, compared with 66% in the three months before that.
The breakdown
- Mon59%(51 flights)
- Tue77%(52 flights)
- Wed74%(49 flights)
- Thu63%(48 flights)
- Fri71%(51 flights)
- Sat61%(51 flights)
- Sun59%(51 flights)
33%
May
Jun 70% → May 33% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 70% | 30 |
| July 2025 | 63% | 30 |
| August 2025 | 84% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 81% | 31 |
| November 2025 | 66% | 29 |
| December 2025 | 54% | 26 |
| January 2026 | 76% | 29 |
| February 2026 | 69% | 26 |
| March 2026 | 77% | 31 |
| April 2026 | 30% | 30 |
| May 2026 | 33% | 30 |
- Departures on time
- 77%
- Diverted
- 0%
- Flights flown
- 353
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 360 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.