Flight number record
AS 1305
Alaska Airlines · Los Angeles to Seattle
- Route
- LAX → SEA
- Departs
- 12:00
- Flights
- 304
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AS 1305, check with Alaska Airlines.
AS 1305 lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 304 flights, with a median arrival 4 minutes early.
Key figures
On time
76.8%
Arrivals under 15 minutes late, of 297 completed flights
Avg delay
55 min
Across delayed arrivals only, not all flights
Cancelled
2.30%
National rate is 1.81%
1 hour+ late
7.1%
National rate is 8.1%
These figures cover 304 flights between July 2025 and June 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.
Schedule
When AS 1305 flies
AS 1305 flies LAX to SEA without a single fixed slot. Its most common scheduled departure was 12:00, used on 54 of 304 flights, with 11:00 (41 flights) and 11:55 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 12:0054 flights17.8%
- Departs 11:0041 flights13.5%
- Departs 11:5536 flights11.8%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 12:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and AS 1305 runs 2 points worse at 76.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
AS 1305 next to LAX to SEA
Every carrier on LAX to SEA combined arrived on time 85.4% of the time across 7,424 flights, so AS 1305 is 9 points behind it. Alaska flew 3,279 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 79.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1305thin sample | 304 | 76.8% | 55 min | 2.30% | B |
| All Alaska Airlines on LAX–SEA | 3,279 | 85.2% | 49 min | 1.10% | A |
| All carriers on LAX–SEA | 7,424 | 85.4% | 64 min | 0.98% | A+ |
| Alaska Airlines, whole network | 293,372 | 79.1% | 52 min | 1.28% | B |
Across the year
AS 1305 quarter by quarter
AS 1305 did not run the same all year. Its best quarter was Oct–Dec 2025 at 90.5% on time and its weakest Apr–Jun 2026 at 58.7%, a swing of 32 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 202577 flights82.4%
- Oct–Dec 202577 flights90.5%
- Jan–Mar 202675 flights75.7%
- Apr–Jun 202675 flights58.7%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 1305 did best on Sunday at 90.0% on time and worst on Thursday at 68.8%. Each day rests on about 43 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Delay causes
Why AS 1305 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,796 reported delay minutes.
- 41%Late-arriving aircraft
- 33%Carrier
- 24%National Airspace System
- 1%Extreme weather
- 1%Security
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 3,796 reported delay minutes here, that single category outweighs weather by 28 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 3,796 delay minutes reported on AS 1305.
Cancellations sit at 2.30% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
7.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 304 flights under AS 1305 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. 304 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 1305
For a booking, AS 1305 is one of the weaker ways to fly LAX to SEA: 9 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
- LAX to SEA, every carrier and departure
- SEA to LAX, the return direction
- Delta Air Lines 2606 on the same route84.8%
- Delta Air Lines 2980 on the same route91.9%
- Delta Air Lines 2640 on the same route82.4%
- Delta Air Lines 1714 on the same route92.5%
- Delta Air Lines 1045 on the same route88.8%
- Alaska Airlines 1301 on the same route86.8%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.