Flight number record

AS 1327

Alaska Airlines · San Francisco to Seattle

Route: SFO → SEA
Departs: 19:49
Flights: 252
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 1327, check with Alaska Airlines.

AS 1327 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 252 flights, with a median arrival 4 minutes late.

The national on-time rate over the same period is 77.6%, so AS 1327 runs 15 points behind the country as a whole. Across a thousand flights that is about 154 extra late arrivals.

On time

62.2%

Arrivals under 15 minutes late, of 246 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

2.38%

National rate is 1.81%

1 hour+ late

12.2%

National rate is 8.1%

These figures cover 252 flights between July 2025 and June 2026. Beyond the headline rate, 12.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When AS 1327 flies

AS 1327 flies SFO to SEA without a single fixed slot. Its most common scheduled departure was 19:49, used on 42 of 252 flights, with 19:40 (36 flights) and 20:19 (26 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:4942 flights16.7%
Departs 19:4036 flights14.3%
Departs 20:1926 flights10.3%

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 19:49 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AS 1327 runs 6 points worse at 62.2%. 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 1327 next to SFO to SEA

Every carrier on SFO to SEA combined arrived on time 73.7% of the time across 6,770 flights, so AS 1327 is 12 points behind it. Alaska flew 2,719 flights on the same city pair under all its flight numbers, including this one, and those ran 69.1% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight trails by 17 points.

AS 1327 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 1327thin sample	252	62.2%	60 min	2.38%	D
All Alaska Airlines on SFO–SEA	2,719	69.1%	53 min	1.62%	C
All carriers on SFO–SEA	6,770	73.7%	56 min	1.18%	C
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 1327 quarter by quarter

AS 1327 did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.9% on time and its weakest Jul–Sep 2025 at 43.7%, a swing of 45 points on roughly 84 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 202573 flights43.7%
Oct–Dec 202586 flights59.3%
Jan–Mar 202666 flights88.9%
Apr–Jun 202627 flights—

Scale runs 35% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, AS 1327 did best on Saturday at 71.0% on time and worst on Friday at 51.3%. Each day rests on about 36 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 1327 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 50% of the 5,569 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
50%
National Airspace System
30%
Carrier
20%
Extreme weather
1%

50% 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 5,569 reported delay minutes here, that single category outweighs weather by 50 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 5,569 delay minutes reported on AS 1327.

Cancellations sit at 2.38% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The 679 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 SEA to LIH (1), but none flew often enough under AS 1327 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to SEA only.

One caution: this is a thin sample. 252 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 1327

For a booking, AS 1327 is a flight to put a long connection behind. 12.2% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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