Flight Reliability
DL 1231 · Delta Air Lines
New York → Detroit (LGA–DTW)
81
Pretty Reliable
WanderNerd Reliability Score
- 96%
- Arrive within 15 minutes
- 11 min early
- Average arrival delay
- 5.8%
- Cancelled
- 12 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Wednesday comes out ahead.
A small edge: 98% on time on Wednesdays against 92% on Sundays.
Well ahead of the LGA–DTW route.
DL 1231 arrived on time 96% of the time, versus 78% across the LGA–DTW route.
Better than the Delta Air Lines network average.
DL 1231 arrived on time 96% of the time, versus 81% across the Delta Air Lines network.
Keep a backup plan handy.
DL 1231 was cancelled 5.8% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon94%(46 flights)
- Tue96%(47 flights)
- Wed98%(52 flights)
- Thu98%(50 flights)
- Fri96%(51 flights)
- Sat98%(48 flights)
- Sun92%(50 flights)
100%
May
Jun 93% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 93% | 29 |
| July 2025 | 100% | 29 |
| August 2025 | 97% | 31 |
| September 2025 | 100% | 30 |
| October 2025 | 97% | 31 |
| November 2025 | 97% | 30 |
| December 2025 | 75% | 24 |
| January 2026 | 93% | 29 |
| February 2026 | 96% | 26 |
| March 2026 | 100% | 24 |
| April 2026 | 100% | 30 |
| May 2026 | 100% | 31 |
- Departures on time
- 97%
- Diverted
- 0%
- Flights flown
- 344
- Months covered
- 12
Same route, other flights
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.