Flight Reliability
DL 1031 · Delta Air Lines
Atlanta → Detroit (ATL–DTW)
86
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 3 min
- Average arrival delay
- 0.8%
- Cancelled
- 6 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Saturdays have been rough.
DL 1031 arrived on time 92% of the time on Wednesdays and just 69% on Saturdays. That gap is worth planning around.
A bit ahead of the ATL–DTW route.
DL 1031 arrived on time 83% of the time, versus 78% across the ATL–DTW route.
Trending in the right direction.
DL 1031 arrived on time 87% of the time over the last three months in the data, compared with 77% in the three months before that.
The breakdown
- Mon82%(51 flights)
- Tue85%(52 flights)
- Wed92%(52 flights)
- Thu85%(52 flights)
- Fri89%(52 flights)
- Sat69%(52 flights)
- Sun78%(50 flights)
83%
May
Jun 77% → May 83% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 77% | 30 |
| July 2025 | 70% | 30 |
| August 2025 | 77% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 97% | 29 |
| December 2025 | 74% | 31 |
| January 2026 | 68% | 31 |
| February 2026 | 89% | 28 |
| March 2026 | 81% | 31 |
| April 2026 | 97% | 29 |
| May 2026 | 83% | 30 |
- Departures on time
- 81%
- Diverted
- 0.3%
- Flights flown
- 361
- 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.