Flight Reliability
DL 740 · Delta Air Lines
New York → Seattle (JFK–SEA)
65
Usually Fine
WanderNerd Reliability Score
- 69%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 2.2%
- Cancelled
- 1 min
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
DL 740 departing between 3–6 PM arrived on time 70% of the time, versus 47% between 12–3 PM.
Sunday scaries are real for this one.
DL 740 arrived on time 76% of the time on Tuesdays and just 54% on Sundays. That gap is worth planning around.
Lagging the Delta Air Lines network.
DL 740 arrived on time 69% of the time, versus 81% across the Delta Air Lines network.
Ticking up lately.
DL 740 arrived on time 69% of the time over the last three months in the data, compared with 64% in the three months before that.
The breakdown
- Mon68%(50 flights)
- Tue76%(50 flights)
- Wed76%(50 flights)
- Thu65%(52 flights)
- Fri72%(50 flights)
- Sat75%(51 flights)
- Sun54%(50 flights)
- 12–3 PM47%(15 flights)
- 3–6 PM70%(338 flights)
79%
May
Jun 57% → May 79% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 57% | 30 |
| July 2025 | 62% | 29 |
| August 2025 | 90% | 30 |
| September 2025 | 83% | 29 |
| October 2025 | 77% | 31 |
| November 2025 | 67% | 30 |
| December 2025 | 41% | 29 |
| January 2026 | 77% | 30 |
| February 2026 | 73% | 26 |
| March 2026 | 50% | 30 |
| April 2026 | 77% | 30 |
| May 2026 | 79% | 29 |
- Departures on time
- 80%
- Diverted
- 0.8%
- Flights flown
- 353
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 364 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.