Flight Reliability
DL 1819 · Delta Air Lines
Louisville → Atlanta (SDF–ATL)
97
Nerd Approved
WanderNerd Reliability Score
- 91%
- Arrive within 15 minutes
- 5 min early
- Average arrival delay
- 0.5%
- Cancelled
- 18 min early
- Median arrival delay
Based on 190 historical flights. Data through May 2026.
What the data says
Tuesday is the weak spot.
DL 1819 arrived on time 96% of the time on Thursdays. On Tuesdays: 82%.
Better than the Delta Air Lines network average.
DL 1819 arrived on time 91% of the time, versus 81% across the Delta Air Lines network.
Slipping a little lately.
DL 1819 arrived on time 87% of the time over the last three months in the data, compared with 91% in the three months before that.
The breakdown
- Mon93%(28 flights)
- Tue82%(28 flights)
- Wed89%(28 flights)
- Thu96%(28 flights)
- Fri89%(28 flights)
- Sat96%(22 flights)
- Sun93%(27 flights)
77%
Dec
Jun 96% → Dec 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 96% | 23 |
| July 2025 | 84% | 31 |
| August 2025 | 90% | 31 |
| September 2025 | 100% | 30 |
| October 2025 | 100% | 31 |
| November 2025 | 85% | 26 |
| December 2025 | 77% | 17 |
- Departures on time
- 92%
- Diverted
- 0%
- Flights flown
- 189
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 190 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.