Flight number record
AS 1321
Alaska Airlines · Seattle to Santa Rosa
- Route
- SEA → STS
- Departs
- 09:54
- Flights
- 258
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 1321, check with Alaska Airlines.
AS 1321 lands a B+, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 45 minutes on average. That rests on 258 flights, with a median arrival 8 minutes early.
Set against the rest of the country, AS 1321's record is 5 points better than the US average of 77.3%. That gap is worth roughly 47 fewer late arrivals for every thousand flights.
Key figures
On time
82.0%
Arrivals under 15 minutes late, of 255 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
0.78%
National rate is 1.89%
1 hour+ late
2.7%
National rate is 8.3%
These figures cover 258 flights between September 2025 and August 2026. The median arrival is 8 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 1321 flies
AS 1321 flies SEA to STS without a single fixed slot. Its most common scheduled departure was 09:54, used on 70 of 258 flights, with 11:30 (33 flights) and 11:15 (26 flights) next.
- Departs 09:5470 flights27.1%
- Departs 11:3033 flights12.8%
- Departs 11:1526 flights10.1%
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 09:54 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 1321 runs level with that at 82.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
AS 1321 next to SEA to STS
Every carrier on SEA to STS combined arrived on time 82.8% of the time across 420 flights, so AS 1321 is about level with it. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1321thin sample | 258 | 82.0% | 45 min | 0.78% | B+ |
| All Alaska Airlines on SEA–STSthin sample | 358 | 85.6% | 44 min | 2.23% | A |
| All carriers on SEA–STS | 420 | 82.8% | 44 min | 1.90% | B |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 1321 quarter by quarter
AS 1321 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.9% on time and its weakest Jul–Sep 2026 at 77.4%, a swing of 16 points on roughly 86 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 202530 flights—
- Oct–Dec 202590 flights81.8%
- Jan–Mar 20266 flights—
- Apr–Jun 202670 flights92.9%
- Jul–Sep 202662 flights77.4%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, AS 1321 did best on Thursday at 89.2% on time and worst on Wednesday at 75.7%. Each day rests on about 37 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 1321 runs when it is late
AS 1321 often beats the schedule: 70 of 255 completed flights, 27%, arrived 15 minutes or more early. The 46 late arrivals split 19 under half an hour, 20 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early70 flights27.5%
- Within 15 min139 flights54.5%
- 15–29 min late19 flights7.5%
- 30–59 min late20 flights7.8%
- 1–2 hours late4 flights1.6%
- 2+ hours late3 flights1.2%
Scale runs 0% to 100%.
Share of 255 completed flights by arrival against schedule.
13 of 50 late departures made up the time and arrived on time, 26% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for AS 1321
The latest arrival of the period was on 24 October 2025, 4 hours 25 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 |
|---|---|---|
| 24 October 2025 | 4 hours 25 minutes | Carrier |
| 6 June 2026 | 2 hours 16 minutes | National Airspace System |
| 24 August 2026 | 2 hours 14 minutes | Carrier |
| 30 August 2026 | 1 hour 19 minutes | Carrier |
| 16 July 2026 | 1 hour 18 minutes | Extreme weather |
Delay causes
Why AS 1321 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 2,046 reported delay minutes.
- 42%Carrier
- 30%Late-arriving aircraft
- 24%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 857 of the 2,046 delay minutes reported here. The split is drawn from 2,046 delay minutes reported on AS 1321.
Cancellations are rare at 0.78%, 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 2.7% 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 618 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 one other city pair in the data, including STS to SEA (50), but none flew often enough under AS 1321 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to STS only.
One caution: this is a thin sample. 258 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 1321
For a booking, read AS 1321 as 82.0% on time with 0.78% cancelled over 258 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- 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
- Worst months to fly in the US, ranked by the data
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.