Flight Reliability
DL 1551 · Delta Air Lines
Los Angeles → Seattle (LAX–SEA)94% of its flights flew this route. The rest (ATL–PNS, PNS–ATL) are included in these numbers.
88
Pretty Reliable
WanderNerd Reliability Score
- 85%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 0.6%
- Cancelled
- 12 min early
- Median arrival delay
Based on 330 historical flights. Data through May 2026.
What the data says
Skip Tuesday if you can.
DL 1551 arrived on time 91% of the time on Fridays. On Tuesdays: 79%.
A bit ahead of the Delta Air Lines network.
DL 1551 arrived on time 85% of the time, versus 81% across the Delta Air Lines network.
Slipping a little lately.
DL 1551 arrived on time 82% of the time over the last three months in the data, compared with 88% in the three months before that.
The breakdown
- Mon87%(52 flights)
- Tue79%(38 flights)
- Wed90%(49 flights)
- Thu80%(50 flights)
- Fri91%(53 flights)
- Sat90%(31 flights)
- Sun81%(53 flights)
- 6–9 PM85%(325 flights)
- 9 PM–12 AM—(1 flights)
58%
May
Jun 93% → May 58% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 93% | 30 |
| July 2025 | 79% | 29 |
| August 2025 | 87% | 31 |
| September 2025 | 100% | 30 |
| October 2025 | 70% | 30 |
| November 2025 | 82% | 28 |
| December 2025 | 91% | 35 |
| January 2026 | 89% | 27 |
| February 2026 | 83% | 18 |
| March 2026 | 96% | 22 |
| April 2026 | 91% | 22 |
| May 2026 | 58% | 24 |
- Departures on time
- 80%
- Diverted
- 0.6%
- Flights flown
- 326
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 330 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.