Flight number record
AS 725
Alaska Airlines · Seattle to San Francisco
- Route
- SEA → SFO
- Departs
- 07:03
- Flights
- 299
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 725, check with Alaska Airlines.
AS 725 earns an F, which is as low as this site's scale goes for a reason. Only 50.5% of flights arrive inside the 15-minute window, 27 points worse than the national rate of 77.3%. Late arrivals average roughly 50 minutes. Treat any tight connection here as a coin flip. That rests on 299 flights, with a median arrival 14 minutes late.
The national on-time rate over the same period is 77.3%, so AS 725 runs 27 points behind the country as a whole. Across a thousand flights that is about 268 extra late arrivals.
Key figures
On time
50.5%
Arrivals under 15 minutes late, of 293 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
2.01%
National rate is 1.89%
1 hour+ late
10.6%
National rate is 8.3%
These figures cover 299 flights between September 2025 and August 2026. Beyond the headline rate, 10.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When AS 725 flies
AS 725 flies SEA to SFO without a single fixed slot. Its most common scheduled departure was 07:03, used on 95 of 299 flights, with 08:25 (36 flights) and 08:15 (34 flights) next.
- Departs 07:0395 flights31.8%
- Departs 08:2536 flights12.0%
- Departs 08:1534 flights11.4%
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 07:03 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 725 runs 39 points worse at 50.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
AS 725 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 725 is 9 points behind 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 29 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 725thin sample | 299 | 50.5% | 48 min | 2.01% | F |
| 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 725 quarter by quarter
AS 725 did not run the same all year. Its best quarter was Jan–Mar 2026 at 79.8% on time and its weakest Apr–Jun 2026 at 22.6%, a swing of 57 points on roughly 75 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 202566 flights66.2%
- Jan–Mar 202686 flights79.8%
- Apr–Jun 202685 flights22.6%
- Jul–Sep 202662 flights31.7%
Scale runs 15% to 85%.
By weekday, AS 725 did best on Wednesday at 57.9% on time and worst on Friday at 43.9%. Each day rests on about 43 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 725 runs when it is late
The 145 late arrivals split 39 under half an hour, 75 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early33 flights11.3%
- Within 15 min115 flights39.2%
- 15–29 min late39 flights13.3%
- 30–59 min late75 flights25.6%
- 1–2 hours late25 flights8.5%
- 2+ hours late6 flights2.0%
Scale runs 0% to 100%.
Share of 293 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 130 departures that left 15 minutes late or more, only 11 made it up before arrival. In the other direction, 26 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 725
The latest arrival of the period was on 26 December 2025, 3 hours 12 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across December, May, January and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 December 2025 | 3 hours 12 minutes | Carrier |
| 28 May 2026 | 2 hours 56 minutes | National Airspace System |
| 5 January 2026 | 2 hours 12 minutes | Extreme weather |
| 17 January 2026 | 2 hours 5 minutes | Carrier |
| 26 February 2026 | 2 hours 5 minutes | National Airspace System |
Delay causes
Why AS 725 runs late
National Airspace System accounts for 82% of the 6,900 delay minutes carriers reported here, and the remaining four split what is left.
- 82%National Airspace System
- 13%Carrier
- 5%Extreme weather
- 0%Late-arriving aircraft
82% 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 5,632 minutes out of 6,900, against a national NAS share of 21%. The split is drawn from 6,900 delay minutes reported on AS 725.
Cancellations sit at 2.01% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
10.6% 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 PDX to AUS (33), but none flew often enough under AS 725 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to SFO only.
One caution: this is a thin sample. 299 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 725
For a booking, AS 725 is one of the weaker ways to fly SEA to SFO: 9 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
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%
- 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
- How often a connection fails at the major US hubs
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.