Flight number record
AS 1305
Alaska Airlines · Los Angeles to Seattle
- Route
- LAX → SEA
- Departs
- 12:47
- Flights
- 312
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 1305, check with Alaska Airlines.
AS 1305 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about 55 minutes behind schedule. That rests on 312 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so AS 1305 runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.
Key figures
On time
73.3%
Arrivals under 15 minutes late, of 307 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
1.60%
National rate is 1.89%
1 hour+ late
7.5%
National rate is 8.3%
These figures cover 312 flights between September 2025 and August 2026. The median arrival is 2 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 1305 flies
AS 1305 flies LAX to SEA without a single fixed slot. Its most common scheduled departure was 12:47, used on 70 of 312 flights, with 12:00 (45 flights) and 11:00 (41 flights) next.
- Departs 12:4770 flights22.4%
- Departs 12:0045 flights14.4%
- Departs 11:0041 flights13.1%
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 12:47 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and AS 1305 runs 5 points worse at 73.3%. 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 1305 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 1305 is 12 points behind 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 trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1305thin sample | 312 | 73.3% | 54 min | 1.60% | C |
| 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 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 78 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 202525 flights—
- Oct–Dec 202577 flights90.5%
- Jan–Mar 202675 flights75.7%
- Apr–Jun 202675 flights58.7%
- Jul–Sep 202660 flights60.0%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 1305 did best on Sunday at 84.0% on time and worst on Thursday at 62.0%. Each day rests on about 45 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 1305 runs when it is late
AS 1305 often beats the schedule: 83 of 307 completed flights, 27%, arrived 15 minutes or more early. The 82 late arrivals split 29 under half an hour, 30 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early83 flights27.0%
- Within 15 min142 flights46.3%
- 15–29 min late29 flights9.4%
- 30–59 min late30 flights9.8%
- 1–2 hours late16 flights5.2%
- 2+ hours late7 flights2.3%
Scale runs 0% to 100%.
Share of 307 completed flights by arrival against schedule.
A late pushback is often recovered here: of 112 departures that left 15 minutes late or more, 35 still arrived on time. Only 5 left on time and still arrived late.
The worst days
Worst days for AS 1305
The latest arrival of the period was on 19 August 2026, 4 hours 58 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 August 2026 | 4 hours 58 minutes | Carrier |
| 8 February 2026 | 3 hours 51 minutes | Carrier |
| 7 August 2026 | 3 hours 26 minutes | Late-arriving aircraft |
| 24 February 2026 | 3 hours 9 minutes | Carrier |
| 26 July 2026 | 2 hours 23 minutes | Late-arriving aircraft |
Delay causes
Why AS 1305 runs late
Late-arriving aircraft accounts for 52% of the 4,445 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 30%Carrier
- 16%National Airspace System
- 1%Extreme weather
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,445 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 4,445 delay minutes reported on AS 1305.
Cancellations sit at 1.60% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
7.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 55 minutes, 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.
Every one of the 312 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. 312 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: 12 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 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%
- Frontier Airlines 1177 on the same route83.6%
- 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.