Flight number record
AS 1300
Alaska Airlines · Seattle to Los Angeles
- Route
- SEA → LAX
- Departs
- 15:59
- Flights
- 302
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 1300, check with Alaska Airlines.
AS 1300 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land roughly 40 minutes behind schedule. That rests on 302 flights, with a median arrival 1 minute early.
Key figures
On time
74.7%
Arrivals under 15 minutes late, of 296 completed flights
Avg delay
42 min
Across delayed arrivals only, not all flights
Cancelled
1.99%
National rate is 1.89%
1 hour+ late
4.1%
National rate is 8.3%
These figures cover 302 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When AS 1300 flies
AS 1300 flies SEA to LAX without a single fixed slot. Its most common scheduled departure was 15:59, used on 70 of 302 flights, with 14:59 (43 flights) next.
- Departs 15:5970 flights23.2%
- Departs 14:5943 flights14.2%
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 15:59 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and AS 1300 runs 3 points better at 74.7%. 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 1300 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 1300 is 7 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%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1300thin sample | 302 | 74.7% | 42 min | 1.99% | C |
| 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 1300 quarter by quarter
AS 1300 did not run the same all year. Its best quarter was Jan–Mar 2026 at 86.1% on time and its weakest Jul–Sep 2026 at 48.4%, a swing of 38 points on roughly 76 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.
- Jul–Sep 202522 flights—
- Oct–Dec 202576 flights78.1%
- Jan–Mar 202673 flights86.1%
- Apr–Jun 202669 flights79.4%
- Jul–Sep 202662 flights48.4%
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, AS 1300 did best on Tuesday at 85.7% on time and worst on Friday at 62.8%. Each day rests on about 43 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 1300 runs when it is late
Most of the lateness is short. 38 of the 75 late arrivals were under half an hour behind, and 12 reached an hour or more.
- 15+ min early57 flights19.3%
- Within 15 min164 flights55.4%
- 15–29 min late38 flights12.8%
- 30–59 min late25 flights8.4%
- 1–2 hours late8 flights2.7%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 296 completed flights by arrival against schedule.
16 of 75 late departures made up the time and arrived on time, 21% of them. 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 1300
The latest arrival of the period was on 30 November 2025, 3 hours 35 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 November 2025 | 3 hours 35 minutes | Carrier |
| 6 August 2026 | 2 hours 39 minutes | Carrier |
| 12 December 2025 | 2 hours 32 minutes | Carrier |
| 16 July 2026 | 2 hours 8 minutes | Late-arriving aircraft |
| 3 June 2026 | 1 hour 44 minutes | Carrier |
Delay causes
Why AS 1300 runs late
Carrier accounts for 48% of the 3,116 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 35%Late-arriving aircraft
- 17%National Airspace System
- 0%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,116 reported delay minutes here, that single category outweighs weather by 35 to one. The split is drawn from 3,116 delay minutes reported on AS 1300.
Cancellations sit at 1.99% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.1% 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 302 flights under AS 1300 in the data flew SEA to LAX. 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. 302 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 1300
For a booking, AS 1300 is one of the weaker ways to fly SEA to LAX: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
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.