Flight Reliability
DL 991 · Delta Air Lines
Los Angeles → New York (LAX–JFK)
78
Usually Fine
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 9 min
- Average arrival delay
- 1.4%
- Cancelled
- 9 min early
- Median arrival delay
Based on 349 historical flights. Data through May 2026.
What the data says
Morning flights do better here.
DL 991 departing between 6–9 AM arrived on time 95% of the time, versus 72% between 12–3 PM.
Mondays have been rough.
DL 991 arrived on time 90% of the time on Tuesdays and just 68% on Mondays. That gap is worth planning around.
The breakdown
- Mon68%(50 flights)
- Tue90%(49 flights)
- Wed68%(47 flights)
- Thu80%(49 flights)
- Fri86%(51 flights)
- Sat84%(45 flights)
- Sun78%(50 flights)
- 6–9 AM95%(20 flights)
- 9 AM–12 PM—(3 flights)
- 12–3 PM72%(114 flights)
- 3–6 PM81%(192 flights)
- 9 PM–12 AM83%(12 flights)
88%
May
Jun 76% → May 88% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 76% | 29 |
| July 2025 | 83% | 30 |
| August 2025 | 81% | 31 |
| September 2025 | 83% | 30 |
| October 2025 | 81% | 31 |
| November 2025 | 83% | 29 |
| December 2025 | 82% | 27 |
| January 2026 | 71% | 24 |
| February 2026 | 76% | 25 |
| March 2026 | 58% | 31 |
| April 2026 | 90% | 29 |
| May 2026 | 88% | 25 |
- Departures on time
- 74%
- Diverted
- 0.9%
- Flights flown
- 341
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 349 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.