Flight number record
AS 655
Alaska Airlines · Seattle to San Francisco
- Route
- SEA → SFO
- Departs
- 11:42
- Flights
- 305
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 655, check with Alaska Airlines.
AS 655 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is roughly 50 minutes behind schedule. Build slack into anything you connect to. That rests on 305 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.3%, so AS 655 runs 10 points behind the country as a whole. Across a thousand flights that is about 101 extra late arrivals.
Key figures
On time
67.2%
Arrivals under 15 minutes late, of 305 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
4.3%
National rate is 8.3%
These figures cover 305 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When AS 655 flies
AS 655 flies SEA to SFO without a single fixed slot. Its most common scheduled departure was 11:42, used on 69 of 305 flights, with 11:40 (65 flights) and 11:43 (36 flights) next.
- Departs 11:4269 flights22.6%
- Departs 11:4065 flights21.3%
- Departs 11:4336 flights11.8%
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 11:42 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and AS 655 runs 11 points worse at 67.2%. 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 655 next to SEA to SFO
Every carrier on SEA to SFO combined arrived on time 59.8% of the time across 6,817 flights, so AS 655 is 7 points ahead of it. Alaska flew 2,727 flights on the same city pair under all its flight numbers, including this one, and those ran 56.0% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 655thin sample | 305 | 67.2% | 49 min | 0.00% | C+ |
| All Alaska Airlines on SEA–SFO | 2,727 | 56.0% | 52 min | 1.14% | D |
| All carriers on SEA–SFO | 6,817 | 59.8% | 57 min | 1.11% | D |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 655 quarter by quarter
AS 655 did not run the same all year. Its best quarter was Apr–Jun 2026 at 73.6% on time and its weakest Oct–Dec 2025 at 58.1%, a swing of 15 points on roughly 76 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.
- Oct–Dec 202562 flights58.1%
- Jan–Mar 202690 flights72.2%
- Apr–Jun 202691 flights73.6%
- Jul–Sep 202662 flights59.7%
Scale runs 50% to 80%.
By weekday, AS 655 did best on Saturday at 76.9% on time and worst on Monday at 55.6%. Each day rests on about 44 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 655 runs when it is late
The 100 late arrivals split 45 under half an hour, 42 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early52 flights17.0%
- Within 15 min153 flights50.2%
- 15–29 min late45 flights14.8%
- 30–59 min late42 flights13.8%
- 1–2 hours late5 flights1.6%
- 2+ hours late8 flights2.6%
Scale runs 0% to 100%.
Share of 305 completed flights by arrival against schedule.
33 of 122 late departures made up the time and arrived on time, 27% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for AS 655
The latest arrival of the period was on 21 March 2026, 7 hours 49 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across March, August and January, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 March 2026 | 7 hours 49 minutes | Carrier |
| 13 March 2026 | 3 hours 43 minutes | Late-arriving aircraft |
| 31 August 2026 | 3 hours 41 minutes | Late-arriving aircraft |
| 7 January 2026 | 3 hours 26 minutes | Carrier |
| 3 January 2026 | 3 hours 19 minutes | National Airspace System |
Delay causes
Why AS 655 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 4,882 reported delay minutes.
- 31%Late-arriving aircraft
- 31%National Airspace System
- 31%Carrier
- 6%Extreme weather
No single cause dominates. late-arriving aircraft at 31%, national airspace system at 31% and carrier at 31% split the 4,882 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around. The split is drawn from 4,882 delay minutes reported on AS 655.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 4.3% 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 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.
Every one of the 305 flights under AS 655 in the data flew SEA to SFO. 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. 305 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 655
For a booking, read AS 655 as 67.2% on time with 0.00% cancelled over 305 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to SFO, every carrier and departure
- SFO to SEA, the return direction
- United Airlines 737 on the same route53.9%
- Delta Air Lines 1412 on the same route60.1%
- Delta Air Lines 2635 on the same route69.6%
- SkyWest Airlines 3707 on the same route68.5%
- Alaska Airlines 725 on the same route50.5%
- SkyWest Airlines 3991 on the same route59.9%
- Seattle-Tacoma International (SEA) delay statistics
- San Francisco International (SFO) 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.