Flight Reliability
DL 4243 · Delta Air Lines
Detroit → ESC (DTW–ESC)
56
A Little Dicey
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 6.8%
- Cancelled
- 16 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 4243 arrived on time 88% of the time on Wednesdays. On Sundays: 77%.
Keep a backup plan handy.
DL 4243 was cancelled 6.8% of the time. Typical for U.S. flights is around 1–2%.
Trending in the right direction.
DL 4243 arrived on time 85% of the time over the last three months in the data, compared with 69% in the three months before that.
The breakdown
- Mon85%(46 flights)
- Tue83%(48 flights)
- Wed88%(49 flights)
- Thu84%(51 flights)
- Fri83%(46 flights)
- Sat87%(47 flights)
- Sun77%(47 flights)
- 3–6 PM—(3 flights)
- 9 PM–12 AM84%(331 flights)
77%
May
Jun 83% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 87% | 30 |
| August 2025 | 90% | 31 |
| September 2025 | 97% | 30 |
| October 2025 | 87% | 30 |
| November 2025 | 96% | 28 |
| December 2025 | 67% | 27 |
| January 2026 | 75% | 28 |
| February 2026 | 65% | 23 |
| March 2026 | 83% | 24 |
| April 2026 | 96% | 22 |
| May 2026 | 77% | 31 |
- Departures on time
- 86%
- Diverted
- 1.6%
- Flights flown
- 334
- Months covered
- 12
Keep nerding
Based on 365 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.