Flight number record
AS 680
Alaska Airlines · Seattle to San Francisco
- Route
- SEA → SFO
- Departs
- 13:20
- Flights
- 280
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 680, check with Alaska Airlines.
AS 680 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 280 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.3%, so AS 680 runs 12 points behind the country as a whole. Across a thousand flights that is about 118 extra late arrivals.
Key figures
On time
65.5%
Arrivals under 15 minutes late, of 275 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
1.79%
National rate is 1.89%
1 hour+ late
8.0%
National rate is 8.3%
These figures cover 280 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% 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 680 flies
AS 680 flies SEA to SFO without a single fixed slot. Its most common scheduled departure was 13:20, used on 69 of 280 flights, with 13:32 (34 flights) and 14:25 (30 flights) next.
- Departs 13:2069 flights24.6%
- Departs 13:3234 flights12.1%
- Departs 14:2530 flights10.7%
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 13:20 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and AS 680 runs 13 points worse at 65.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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 680 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 680 is 6 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 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 680thin sample | 280 | 65.5% | 48 min | 1.79% | 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 680 quarter by quarter
AS 680 did not run the same all year. Its best quarter was Jan–Mar 2026 at 85.0% on time and its weakest Apr–Jun 2026 at 54.4%, a swing of 31 points on roughly 70 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 202557 flights64.3%
- Jan–Mar 202681 flights85.0%
- Apr–Jun 202680 flights54.4%
- Jul–Sep 202662 flights55.0%
Scale runs 45% to 90%.
By weekday, AS 680 did best on Tuesday at 85.0% on time and worst on Thursday at 52.4%. Each day rests on about 40 flights, so a gap of 33 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 680 runs when it is late
The 95 late arrivals split 39 under half an hour, 34 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early42 flights15.3%
- Within 15 min138 flights50.2%
- 15–29 min late39 flights14.2%
- 30–59 min late34 flights12.4%
- 1–2 hours late16 flights5.8%
- 2+ hours late6 flights2.2%
Scale runs 0% to 100%.
Share of 275 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 73 departures that left 15 minutes late or more, only 8 made it up before arrival. 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 SFO.
The worst days
Worst days for AS 680
The latest arrival of the period was on 5 December 2025, 3 hours 52 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 December 2025 | 3 hours 52 minutes | Carrier |
| 16 July 2026 | 3 hours 8 minutes | Late-arriving aircraft |
| 5 January 2026 | 3 hours 3 minutes | Late-arriving aircraft |
| 23 February 2026 | 2 hours 44 minutes | Carrier |
| 30 April 2026 | 2 hours 35 minutes | Late-arriving aircraft |
Delay causes
Why AS 680 runs late
National Airspace System accounts for 47% of the 4,568 delay minutes carriers reported here, and the remaining four split what is left.
- 47%National Airspace System
- 32%Late-arriving aircraft
- 19%Carrier
- 2%Extreme weather
47% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,130 minutes out of 4,568, against a national NAS share of 21%. The split is drawn from 4,568 delay minutes reported on AS 680.
Cancellations sit at 1.79% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
8.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, which a normal layover absorbs.
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 280 flights under AS 680 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. 280 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 680
For a booking, read AS 680 as 65.5% on time with 1.79% cancelled over 280 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 655 on the same route67.2%
- Alaska Airlines 725 on the same route50.5%
- 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
- Why the first flight of the morning is statistically safest
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.