Flight number record

AS 128

Alaska Airlines · Portland to San Francisco

Route: PDX → SFO
Departs: 10:30
Flights: 261
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 128, check with Alaska Airlines.

AS 128 lands a B, level with the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That is a workable record, not a spotless one. That rests on 261 flights, with a median arrival 2 minutes early.

On time

78.3%

Arrivals under 15 minutes late, of 258 completed flights

Avg delay

47 min

Across delayed arrivals only, not all flights

Cancelled

1.15%

National rate is 1.81%

1 hour+ late

3.5%

National rate is 8.1%

These figures cover 261 flights between July 2025 and June 2026. The median arrival is 2 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When AS 128 flies

AS 128 flies PDX to SFO without a single fixed slot. Its most common scheduled departure was 10:30, used on 117 of 261 flights, with 10:33 (36 flights) and 10:48 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:30117 flights44.8%
Departs 10:3336 flights13.8%
Departs 10:4835 flights13.4%

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 10:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 128 runs 6 points worse at 78.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

AS 128 next to PDX to SFO

Every carrier on PDX to SFO combined arrived on time 72.3% of the time across 3,516 flights, so AS 128 is 6 points ahead of it. Alaska flew 1,383 flights on the same city pair under all its flight numbers, including this one, and those ran 72.0% on time. Across its whole network Alaska Airlines managed 79.1%, close to this flight's figure.

AS 128 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 128thin sample	261	78.3%	47 min	1.15%	B
All Alaska Airlines on PDX–SFO	1,383	72.0%	55 min	0.51%	C+
All carriers on PDX–SFO	3,516	72.3%	58 min	0.43%	C+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 128 quarter by quarter

Quarter by quarter AS 128 held fairly steady: 77.2% in Jul–Sep 2025, 76.4% in Oct–Dec 2025 and 85.7% in Jan–Mar 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights77.2%
Oct–Dec 202592 flights76.4%
Jan–Mar 202656 flights85.7%
Apr–Jun 202621 flights—

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, AS 128 did best on Sunday at 89.2% on time and worst on Friday at 65.7%. Each day rests on about 37 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 128 runs late

One category carries most of the weight here. National Airspace System accounts for 66% of the 2,604 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.

National Airspace System
66%
Carrier
27%
Late-arriving aircraft
7%

66% 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 1,712 minutes out of 2,604, against a national NAS share of 21%. The split is drawn from 2,604 delay minutes reported on AS 128.

Cancellations sit at 1.15% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.5% land an hour or more behind schedule, against 8.1% 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 550 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 ATL to SEA (1), but none flew often enough under AS 128 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to PDX to SFO only.

One caution: this is a thin sample. 261 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 128

For a booking, read AS 128 as 78.3% on time with 1.15% cancelled over 261 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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