Flight Reliability
DL 1628 · Delta Air Lines
Seattle → Los Angeles (SEA–LAX)
100
Nerd Approved
WanderNerd Reliability Score
- 93%
- Arrive within 15 minutes
- 9 min early
- Average arrival delay
- 0%
- Cancelled
- 13 min early
- Median arrival delay
Based on 361 historical flights. Data through May 2026.
What the data says
Tuesdays have been rough.
DL 1628 arrived on time 100% of the time on Wednesdays and just 83% on Tuesdays. That gap is worth planning around.
Better than the SEA–LAX route average.
DL 1628 arrived on time 93% of the time, versus 84% across the SEA–LAX route.
Better than the Delta Air Lines network average.
DL 1628 arrived on time 93% of the time, versus 81% across the Delta Air Lines network.
It basically never cancels.
Out of 361 scheduled flights, only 0.0% were cancelled.
The breakdown
- Mon89%(52 flights)
- Tue83%(52 flights)
- Wed100%(50 flights)
- Thu100%(50 flights)
- Fri90%(52 flights)
- Sat92%(52 flights)
- Sun96%(53 flights)
84%
May
Jun 93% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 93% | 30 |
| July 2025 | 94% | 31 |
| August 2025 | 100% | 31 |
| September 2025 | 97% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 100% | 30 |
| December 2025 | 93% | 28 |
| January 2026 | 80% | 30 |
| February 2026 | 89% | 28 |
| March 2026 | 90% | 31 |
| April 2026 | 100% | 30 |
| May 2026 | 84% | 31 |
- Departures on time
- 95%
- Diverted
- 0%
- Flights flown
- 361
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 361 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.