Flight Reliability
DL 335 · Delta Air Lines
San Francisco → Detroit (SFO–DTW)
79
Usually Fine
WanderNerd Reliability Score
- 74%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 0.9%
- Cancelled
- 4 min early
- Median arrival delay
Based on 347 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 335 arrived on time 89% of the time on Saturdays and just 65% on Sundays. That gap is worth planning around.
A bit behind the SFO–DTW route.
DL 335 arrived on time 74% of the time, versus 81% across the SFO–DTW route.
A bit behind the Delta Air Lines network.
DL 335 arrived on time 74% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon75%(52 flights)
- Tue75%(47 flights)
- Wed77%(47 flights)
- Thu73%(51 flights)
- Fri70%(50 flights)
- Sat89%(45 flights)
- Sun65%(52 flights)
42%
May
Jun 59% → May 42% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 59% | 29 |
| July 2025 | 65% | 20 |
| August 2025 | 72% | 25 |
| September 2025 | 83% | 30 |
| October 2025 | 74% | 31 |
| November 2025 | 86% | 29 |
| December 2025 | 83% | 29 |
| January 2026 | 65% | 31 |
| February 2026 | 79% | 28 |
| March 2026 | 87% | 31 |
| April 2026 | 97% | 30 |
| May 2026 | 42% | 31 |
- Departures on time
- 73%
- Diverted
- 0%
- Flights flown
- 344
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 347 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.