Flight Reliability
DL 442 · Delta Air Lines
Detroit → San Francisco (DTW–SFO)
75
Usually Fine
WanderNerd Reliability Score
- 70%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 0.3%
- Cancelled
- 1 min
- Median arrival delay
Based on 350 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
DL 442 arrived on time 84% of the time on Tuesdays and just 61% on Fridays. That gap is worth planning around.
Lagging the Delta Air Lines network.
DL 442 arrived on time 70% of the time, versus 81% across the Delta Air Lines network.
It basically never cancels.
Out of 350 scheduled flights, only 0.3% were cancelled.
The breakdown
- Mon63%(51 flights)
- Tue84%(50 flights)
- Wed75%(48 flights)
- Thu73%(51 flights)
- Fri61%(49 flights)
- Sat70%(46 flights)
- Sun66%(53 flights)
- 12–3 PM—(2 flights)
- 3–6 PM70%(346 flights)
52%
May
Jun 76% → May 52% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 76% | 29 |
| July 2025 | 67% | 30 |
| August 2025 | 74% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 83% | 30 |
| November 2025 | 76% | 29 |
| December 2025 | 50% | 20 |
| January 2026 | 70% | 30 |
| February 2026 | 64% | 28 |
| March 2026 | 71% | 31 |
| April 2026 | 59% | 29 |
| May 2026 | 52% | 31 |
- Departures on time
- 78%
- Diverted
- 0.3%
- Flights flown
- 348
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 350 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.