Flight number record
AS 524
Alaska Airlines · Seattle to Los Angeles
- Route
- SEA → LAX
- Departs
- 18:10
- Flights
- 276
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 524, check with Alaska Airlines.
AS 524 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 40 minutes on average. That rests on 276 flights, with a median arrival 4 minutes early.
Key figures
On time
78.9%
Arrivals under 15 minutes late, of 275 completed flights
Avg delay
40 min
Across delayed arrivals only, not all flights
Cancelled
0.36%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 276 flights between September 2025 and August 2026. The median arrival is 4 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 524 flies
AS 524 flies SEA to LAX without a single fixed slot. Its most common scheduled departure was 18:10, used on 65 of 276 flights, with 17:59 (51 flights) and 18:53 (36 flights) next.
- Departs 18:1065 flights23.6%
- Departs 17:5951 flights18.5%
- Departs 18:5336 flights13.0%
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 18:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 524 runs 11 points better at 78.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 524 next to SEA to LAX
Every carrier on SEA to LAX combined arrived on time 82.0% of the time across 7,536 flights, so AS 524 is 3 points behind it. Alaska flew 3,293 flights on the same city pair under all its flight numbers, including this one, and those ran 80.4% on time. Across its whole network Alaska Airlines managed 79.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 524thin sample | 276 | 78.9% | 40 min | 0.36% | B+ |
| All Alaska Airlines on SEA–LAX | 3,293 | 80.4% | 42 min | 0.91% | B+ |
| All carriers on SEA–LAX | 7,536 | 82.0% | 59 min | 0.81% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 524 quarter by quarter
AS 524 did not run the same all year. Its best quarter was Jan–Mar 2026 at 87.6% on time and its weakest Jul–Sep 2026 at 62.5%, a swing of 25 points on roughly 69 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 202565 flights76.9%
- Jan–Mar 202690 flights87.6%
- Apr–Jun 202665 flights83.1%
- Jul–Sep 202656 flights62.5%
Scale runs 55% to 95%.
By weekday, AS 524 did best on Tuesday at 92.5% on time and worst on Sunday at 66.7%. Each day rests on about 39 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 524 runs when it is late
Most of the lateness is short. 34 of the 58 late arrivals were under half an hour behind, and 10 reached an hour or more.
- 15+ min early62 flights22.5%
- Within 15 min155 flights56.4%
- 15–29 min late34 flights12.4%
- 30–59 min late14 flights5.1%
- 1–2 hours late9 flights3.3%
- 2+ hours late1 flights0.4%
Scale runs 0% to 100%.
Share of 275 completed flights by arrival against schedule.
A late pushback is often recovered here: of 60 departures that left 15 minutes late or more, 18 still arrived on time. In the other direction, 16 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAX.
The worst days
Worst days for AS 524
The latest arrival of the period was on 3 August 2026, 2 hours 22 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 August 2026 | 2 hours 22 minutes | Late-arriving aircraft |
| 18 December 2025 | 1 hour 56 minutes | Late-arriving aircraft |
| 28 December 2025 | 1 hour 44 minutes | Carrier |
| 31 August 2026 | 1 hour 42 minutes | Late-arriving aircraft |
| 15 June 2026 | 1 hour 36 minutes | Carrier |
Delay causes
Why AS 524 runs late
Late-arriving aircraft accounts for 44% of the 2,325 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 32%Carrier
- 20%National Airspace System
- 4%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,325 reported delay minutes here, that single category outweighs weather by 12 to one. The split is drawn from 2,325 delay minutes reported on AS 524.
Cancellations are rare at 0.36%, 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 3.6% 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.
The same number turns up on three other city pairs in the data, including BNA to SEA (20), SFO to PDX (18) and SFO to AUS (1), but none flew often enough under AS 524 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to LAX only.
One caution: this is a thin sample. 276 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 524
For a booking, read AS 524 as 78.9% on time with 0.36% cancelled over 276 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to LAX, every carrier and departure
- LAX to SEA, the return direction
- Delta Air Lines 2769 on the same route83.8%
- Delta Air Lines 2861 on the same route74.2%
- Delta Air Lines 1628 on the same route90.6%
- Delta Air Lines 2830 on the same route83.8%
- Alaska Airlines 505 on the same route82.8%
- Delta Air Lines 2914 on the same route84.0%
- Seattle-Tacoma International (SEA) delay statistics
- Los Angeles International (LAX) 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.