Flight Reliability
DL 4251 · Delta Air Lines
CIU → Minneapolis (CIU–MSP)
61
A Little Dicey
WanderNerd Reliability Score
- 80%
- Arrive within 15 minutes
- 18 min
- Average arrival delay
- 5.6%
- Cancelled
- 12 min early
- Median arrival delay
Based on 357 historical flights. Data through May 2026.
What the data says
Saturdays have been rough.
DL 4251 arrived on time 90% of the time on Fridays and just 67% on Saturdays. That gap is worth planning around.
Keep a backup plan handy.
DL 4251 was cancelled 5.6% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon79%(47 flights)
- Tue83%(42 flights)
- Wed88%(49 flights)
- Thu80%(50 flights)
- Fri90%(51 flights)
- Sat67%(48 flights)
- Sun72%(50 flights)
82%
May
Jun 93% → May 82% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 93% | 30 |
| July 2025 | 74% | 31 |
| August 2025 | 84% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 80% | 30 |
| December 2025 | 69% | 29 |
| January 2026 | 80% | 25 |
| February 2026 | 71% | 24 |
| March 2026 | 68% | 25 |
| April 2026 | 71% | 24 |
| May 2026 | 82% | 27 |
- Departures on time
- 81%
- Diverted
- 0%
- Flights flown
- 337
- Months covered
- 12
Keep nerding
Based on 357 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.