Flight profile · Delta Air Lines
DL1551
Los Angeles (LAX) to Seattle (SEA) · scheduled 7:59 PM – 10:25 PM
How DL1551 performs
768 operations, 2023-07-01 to 2026-06-30.
DL1551 arrived on time 82.0% of the time, against 85.0% for all LAX → SEA flights — this specific departure is 3.0 percentage points worse than the route as a whole. Against Delta Air Lines’s own flights on this route it is 6.0 points worse.
Source: US DOT Bureau of Transportation Statistics · 768 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| DL1551 | 82.0% | 0.52% | -13 min | 7.5% | 768 |
| Delta Air Lines on LAX → SEA | 88.0% | 0.42% | -15 min | 4.1% | 6,648 |
| All LAX → SEA flights | 85.0% | 0.85% | -10 min | 4.1% | 22,509 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
Other routes DL1551 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| ATL→PNS Atlanta to Pensacola | 2024-12-19 – 2026-01-04 | 26 | — |
| PNS→ATL Pensacola to Atlanta | 2024-12-19 – 2026-01-04 | 19 | — |
| MIA→RDU Miami to Raleigh–Durham | 2024-05-07 – 2024-06-06 | 31 | — |
| JFK→MSY New York to New Orleans | 2024-04-09 – 2024-05-06 | 28 | — |
| MSY→JFK New Orleans to New York | 2024-04-09 – 2024-05-06 | 28 | — |
| IND→MSP Indianapolis to Minneapolis | 2024-01-08 – 2024-03-09 | 62 | — |
Because the same number has served different journeys, the statistics above describe only the route DL1551 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 768 records of DL1551 operating LAX → SEA, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.