Flight Reliability
DL 688 · Delta Air Lines
New York → Seattle (JFK–SEA)
58
A Little Dicey
WanderNerd Reliability Score
- 65%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 2.8%
- Cancelled
- 3 min
- Median arrival delay
Based on 359 historical flights. Data through May 2026.
What the data says
Thursdays have been rough.
DL 688 arrived on time 77% of the time on Tuesdays and just 54% on Thursdays. That gap is worth planning around.
A bit behind the JFK–SEA route.
DL 688 arrived on time 65% of the time, versus 69% across the JFK–SEA route.
Well behind the Delta Air Lines network.
DL 688 arrived on time 65% of the time, versus 81% across the Delta Air Lines network.
Trending in the right direction.
DL 688 arrived on time 66% of the time over the last three months in the data, compared with 56% in the three months before that.
The breakdown
- Mon59%(51 flights)
- Tue77%(51 flights)
- Wed66%(50 flights)
- Thu54%(48 flights)
- Fri60%(48 flights)
- Sat74%(49 flights)
- Sun66%(50 flights)
77%
May
Jun 60% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 30 |
| July 2025 | 65% | 31 |
| August 2025 | 87% | 31 |
| September 2025 | 83% | 30 |
| October 2025 | 58% | 31 |
| November 2025 | 54% | 28 |
| December 2025 | 21% | 24 |
| January 2026 | 71% | 28 |
| February 2026 | 76% | 25 |
| March 2026 | 62% | 29 |
| April 2026 | 60% | 30 |
| May 2026 | 77% | 30 |
- Departures on time
- 71%
- Diverted
- 0.6%
- Flights flown
- 347
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 359 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.