Flight Reliability
DL 2159 · Delta Air Lines
San Francisco → Minneapolis (SFO–MSP)93% of its flights flew this route. The rest (DTW–BUF) are included in these numbers.
87
Pretty Reliable
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 0.9%
- Cancelled
- 10 min early
- Median arrival delay
Based on 347 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
DL 2159 arrived on time 94% of the time on Saturdays and just 76% on Mondays. That gap is worth planning around.
The breakdown
- Mon76%(50 flights)
- Tue84%(50 flights)
- Wed90%(50 flights)
- Thu90%(50 flights)
- Fri77%(48 flights)
- Sat94%(47 flights)
- Sun77%(48 flights)
- 3–6 PM84%(321 flights)
- 9 PM–12 AM86%(22 flights)
77%
May
Jun 90% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 30 |
| July 2025 | 90% | 30 |
| August 2025 | 90% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 93% | 30 |
| November 2025 | 72% | 29 |
| December 2025 | 68% | 19 |
| January 2026 | 89% | 27 |
| February 2026 | 82% | 27 |
| March 2026 | 79% | 29 |
| April 2026 | 83% | 30 |
| May 2026 | 77% | 31 |
- Departures on time
- 82%
- Diverted
- 0.3%
- Flights flown
- 343
- 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.