Flight Reliability
DL 415 · Delta Air Lines
Seattle → New York (SEA–JFK)
67
Usually Fine
WanderNerd Reliability Score
- 72%
- Arrive within 15 minutes
- 15 min
- Average arrival delay
- 1.9%
- Cancelled
- 4 min early
- Median arrival delay
Based on 363 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
DL 415 departing between 12–3 PM arrived on time 78% of the time, versus 69% between 9 AM–12 PM.
Friday has been the better bet.
A small edge: 76% on time on Fridays against 69% on Sundays.
Lagging the Delta Air Lines network.
DL 415 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 415 arrived on time 78% of the time over the last three months in the data, compared with 71% in the three months before that.
The breakdown
- Mon75%(51 flights)
- Tue73%(51 flights)
- Wed71%(51 flights)
- Thu73%(51 flights)
- Fri76%(49 flights)
- Sat71%(52 flights)
- Sun69%(48 flights)
- 9 AM–12 PM69%(235 flights)
- 12–3 PM78%(118 flights)
76%
May
Jun 73% → May 76% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 73% | 30 |
| July 2025 | 52% | 31 |
| August 2025 | 80% | 30 |
| September 2025 | 80% | 30 |
| October 2025 | 68% | 31 |
| November 2025 | 71% | 28 |
| December 2025 | 61% | 28 |
| January 2026 | 67% | 30 |
| February 2026 | 85% | 26 |
| March 2026 | 83% | 30 |
| April 2026 | 73% | 30 |
| May 2026 | 76% | 29 |
- Departures on time
- 71%
- Diverted
- 0.8%
- Flights flown
- 353
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 363 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.