Flight number record
AS 1327
Alaska Airlines · San Francisco to Seattle
- Route
- SFO → SEA
- Departs
- 09:00
- Flights
- 258
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 1327, check with Alaska Airlines.
AS 1327 draws a C. About 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 258 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so AS 1327 runs 9 points behind the country as a whole. Across a thousand flights that is about 94 extra late arrivals.
Key figures
On time
67.9%
Arrivals under 15 minutes late, of 252 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
1.94%
National rate is 1.89%
1 hour+ late
9.5%
National rate is 8.3%
These figures cover 258 flights between September 2025 and August 2026. Beyond the headline rate, 9.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When AS 1327 flies
AS 1327 flies SFO to SEA without a single fixed slot. Its most common scheduled departure was 09:00, used on 70 of 258 flights, with 19:40 (36 flights) and 19:37 (26 flights) next.
- Departs 09:0070 flights27.1%
- Departs 19:4036 flights14.0%
- Departs 19:3726 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 09:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 1327 runs 16 points worse at 67.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
AS 1327 next to SFO to SEA
Every carrier on SFO to SEA combined arrived on time 72.3% of the time across 6,821 flights, so AS 1327 is 4 points behind it. Alaska flew 2,729 flights on the same city pair under all its flight numbers, including this one, and those ran 68.8% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1327thin sample | 258 | 67.9% | 67 min | 1.94% | C |
| All Alaska Airlines on SFO–SEA | 2,729 | 68.8% | 54 min | 1.28% | C |
| All carriers on SFO–SEA | 6,821 | 72.3% | 56 min | 1.08% | C |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | 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 Oct–Dec 2025 at 59.3%, a swing of 30 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 202517 flights—
- Oct–Dec 202586 flights59.3%
- Jan–Mar 202666 flights88.9%
- Apr–Jun 202627 flights—
- Jul–Sep 202662 flights60.7%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 1327 did best on Saturday at 75.8% on time and worst on Monday at 61.0%. Each day rests on about 37 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 1327 runs when it is late
AS 1327 often beats the schedule: 70 of 252 completed flights, 28%, arrived 15 minutes or more early. The 81 late arrivals split 29 under half an hour, 28 between 30 and 60 minutes, and 24 an hour or more.
- 15+ min early70 flights27.8%
- Within 15 min101 flights40.1%
- 15–29 min late29 flights11.5%
- 30–59 min late28 flights11.1%
- 1–2 hours late13 flights5.2%
- 2+ hours late11 flights4.4%
Scale runs 0% to 100%.
Share of 252 completed flights by arrival against schedule.
9 of 60 late departures made up the time and arrived on time, 15% of them. In the other direction, 30 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for AS 1327
The latest arrival of the period was on 2 July 2026, 9 hours 2 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 July 2026 | 9 hours 2 minutes | Carrier |
| 16 June 2026 | 6 hours 49 minutes | Carrier |
| 3 August 2026 | 5 hours 20 minutes | Carrier |
| 13 July 2026 | 5 hours 17 minutes | Carrier |
| 23 October 2025 | 3 hours 50 minutes | Carrier |
Delay causes
Why AS 1327 runs late
Carrier accounts for 46% of the 5,462 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 31%National Airspace System
- 23%Late-arriving aircraft
- 0%Extreme weather
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,498 of the 5,462 delay minutes reported here. The split is drawn from 5,462 delay minutes reported on AS 1327.
Cancellations sit at 1.94% against a national 1.89%, which is ordinary. Diversions add another 0.39%.
Connections and routes
What a delay on this flight costs
9.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
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. 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 1327
For a booking, read AS 1327 as 67.9% on time with 1.94% cancelled over 258 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SFO to SEA, every carrier and departure
- SEA to SFO, the return direction
- Delta Air Lines 2721 on the same route95.3%
- Delta Air Lines 1412 on the same route74.1%
- SkyWest Airlines 3707 on the same route65.1%
- Alaska Airlines 758 on the same route67.2%
- SkyWest Airlines 3991 on the same route64.3%
- United Airlines 2279 on the same route75.7%
- San Francisco International (SFO) 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
- The best time of day to fly, according to 7.05 million flight records
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.