Flight number record
AS 585
Alaska Airlines · Los Angeles to Seattle
- Route
- LAX → SEA
- Departs
- 13:59
- Flights
- 291
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 585, check with Alaska Airlines.
AS 585 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 291 flights, with a median arrival 9 minutes early.
Set against the rest of the country, AS 585's record is 8 points better than the US average of 77.3%. That gap is worth roughly 75 fewer late arrivals for every thousand flights.
Key figures
On time
84.8%
Arrivals under 15 minutes late, of 290 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
0.34%
National rate is 1.89%
1 hour+ late
4.8%
National rate is 8.3%
These figures cover 291 flights between September 2025 and August 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When AS 585 flies
AS 585 flies LAX to SEA without a single fixed slot. Its most common scheduled departure was 13:59, used on 70 of 291 flights, with 14:56 (36 flights) and 14:03 (34 flights) next.
- Departs 13:5970 flights24.1%
- Departs 14:5636 flights12.4%
- Departs 14:0334 flights11.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 13:59 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and AS 585 runs 7 points better at 84.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
AS 585 next to LAX to SEA
Every carrier on LAX to SEA combined arrived on time 85.0% of the time across 7,534 flights, so AS 585 is about level with it. Alaska flew 3,292 flights on the same city pair under all its flight numbers, including this one, and those ran 85.2% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 585thin sample | 291 | 84.8% | 48 min | 0.34% | B+ |
| All Alaska Airlines on LAX–SEA | 3,292 | 85.2% | 52 min | 0.88% | A+ |
| All carriers on LAX–SEA | 7,534 | 85.0% | 62 min | 0.84% | A+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 585 quarter by quarter
AS 585 did not run the same all year. Its best quarter was Jan–Mar 2026 at 92.0% on time and its weakest Jul–Sep 2026 at 76.7%, a swing of 15 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Oct–Dec 202552 flights78.8%
- Jan–Mar 202689 flights92.0%
- Apr–Jun 202690 flights86.7%
- Jul–Sep 202660 flights76.7%
Scale runs 70% to 95%.
By weekday, AS 585 did best on Wednesday at 94.9% on time and worst on Sunday at 77.5%. Each day rests on about 42 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 585 runs when it is late
AS 585 often beats the schedule: 108 of 290 completed flights, 37%, arrived 15 minutes or more early. The 44 late arrivals split 19 under half an hour, 11 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early108 flights37.2%
- Within 15 min138 flights47.6%
- 15–29 min late19 flights6.6%
- 30–59 min late11 flights3.8%
- 1–2 hours late11 flights3.8%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 290 completed flights by arrival against schedule.
A late pushback is often recovered here: of 69 departures that left 15 minutes late or more, 28 still arrived on time. Only 3 left on time and still arrived late.
The worst days
Worst days for AS 585
The latest arrival of the period was on 13 December 2025, 2 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 December 2025 | 2 hours 32 minutes | Carrier |
| 28 December 2025 | 2 hours 6 minutes | Late-arriving aircraft |
| 22 July 2026 | 2 hours | Late-arriving aircraft |
| 30 December 2025 | 1 hour 38 minutes | Late-arriving aircraft |
| 1 January 2026 | 1 hour 29 minutes | Late-arriving aircraft |
Delay causes
Why AS 585 runs late
Late-arriving aircraft accounts for 72% of the 2,101 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Late-arriving aircraft
- 23%Carrier
- 5%National Airspace System
72% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,101 reported delay minutes here, that single category outweighs weather by 72 to one. The split is drawn from 2,101 delay minutes reported on AS 585.
Cancellations are rare at 0.34%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 954 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 291 flights under AS 585 in the data flew LAX to SEA. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 291 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking AS 585
For a booking, read AS 585 as 84.8% on time with 0.34% cancelled over 291 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to SEA, every carrier and departure
- SEA to LAX, the return direction
- Delta Air Lines 2606 on the same route83.1%
- Delta Air Lines 2980 on the same route92.2%
- Delta Air Lines 2640 on the same route81.8%
- Delta Air Lines 1714 on the same route91.7%
- Delta Air Lines 1045 on the same route86.9%
- Alaska Airlines 1305 on the same route73.3%
- Los Angeles International (LAX) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.