Flight Reliability
DL 1237 · Delta Air Lines
FSD → Atlanta (FSD–ATL)
85
Pretty Reliable
WanderNerd Reliability Score
- 87%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 1.4%
- Cancelled
- 12 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Tuesday is the weak spot.
DL 1237 arrived on time 92% of the time on Fridays. On Tuesdays: 84%.
A bit ahead of the Delta Air Lines network.
DL 1237 arrived on time 87% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 1237 arrived on time 91% of the time over the last three months in the data, compared with 85% in the three months before that.
The breakdown
- Mon84%(51 flights)
- Tue84%(50 flights)
- Wed87%(52 flights)
- Thu89%(52 flights)
- Fri92%(52 flights)
- Sat86%(51 flights)
- Sun90%(48 flights)
97%
May
Jun 89% → May 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 89% | 28 |
| July 2025 | 90% | 31 |
| August 2025 | 90% | 31 |
| September 2025 | 97% | 30 |
| October 2025 | 71% | 31 |
| November 2025 | 82% | 28 |
| December 2025 | 72% | 29 |
| January 2026 | 90% | 31 |
| February 2026 | 93% | 28 |
| March 2026 | 80% | 30 |
| April 2026 | 97% | 29 |
| May 2026 | 97% | 30 |
- Departures on time
- 91%
- Diverted
- 1.1%
- Flights flown
- 356
- 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.