Flight number record

AS 1321

Alaska Airlines · Seattle to Santa Rosa

Route: SEA → STS
Departs: 17:08
Flights: 256
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 1321, check with Alaska Airlines.

AS 1321 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That is a workable record, not a spotless one. That rests on 256 flights, with a median arrival 8 minutes early.

On time

79.8%

Arrivals under 15 minutes late, of 252 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

1.17%

National rate is 1.81%

1 hour+ late

4.0%

National rate is 8.1%

These figures cover 256 flights between July 2025 and June 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.

Schedule

When AS 1321 flies

AS 1321 flies SEA to STS without a single fixed slot. Its most common scheduled departure was 17:08, used on 49 of 256 flights, with 11:30 (43 flights) and 11:15 (26 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:0849 flights19.1%
Departs 11:3043 flights16.8%
Departs 11:1526 flights10.2%

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 17:08 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AS 1321 runs 12 points better at 79.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

AS 1321 next to SEA to STS

Every carrier on SEA to STS combined arrived on time 82.2% of the time across 428 flights, so AS 1321 is 2 points behind it. Across its whole network Alaska Airlines managed 79.1%, close to this flight's figure.

AS 1321 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 1321thin sample	256	79.8%	49 min	1.17%	B
All Alaska Airlines on SEA–STSthin sample	356	84.6%	48 min	2.53%	B
All carriers on SEA–STS	428	82.2%	51 min	2.10%	B
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	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 2025 at 69.3%, a swing of 24 points on roughly 85 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 202590 flights69.3%
Oct–Dec 202590 flights81.8%
Jan–Mar 20266 flights—
Apr–Jun 202670 flights92.9%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, AS 1321 ranged from 72.7% on Friday to 84.2% on Tuesday. With about 37 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why AS 1321 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 2,477 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
42%
Carrier
39%
National Airspace System
18%
Extreme weather
1%

42% 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 2,477 reported delay minutes here, that single category outweighs weather by 34 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 2,477 delay minutes reported on AS 1321.

Cancellations sit at 1.17% against a national 1.81%, which is ordinary. Diversions add another 0.39%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.0% land an hour or more behind schedule, against 8.1% 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. 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.

The same number turns up on one other city pair in the data, including STS to SEA (99), 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. 256 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 79.8% on time with 1.17% cancelled over 256 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures