Flight number record
AS 525
Alaska Airlines · San Francisco to Portland
- Route
- SFO → PDX
- Departs
- 18:40
- Flights
- 288
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AS 525, check with Alaska Airlines.
AS 525 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 6 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 288 flights, with a median arrival 5 minutes early.
Set against the rest of the country, AS 525's record is 6 points better than the US average of 77.6%. That gap is worth roughly 64 fewer late arrivals for every thousand flights.
Key figures
On time
84.0%
Arrivals under 15 minutes late, of 287 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.35%
National rate is 1.81%
1 hour+ late
3.5%
National rate is 8.1%
These figures cover 288 flights between July 2025 and June 2026. The median arrival is 5 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 525 flies
AS 525 flies SFO to PDX without a single fixed slot. Its most common scheduled departure was 18:40, used on 64 of 288 flights, with 19:05 (49 flights) and 18:45 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:4064 flights22.2%
- Departs 19:0549 flights17.0%
- Departs 18:4545 flights15.6%
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 18:40 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AS 525 runs 16 points better at 84.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
AS 525 next to SFO to PDX
Every carrier on SFO to PDX combined arrived on time 80.4% of the time across 3,514 flights, so AS 525 is 4 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 80.2% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 525thin sample | 288 | 84.0% | 46 min | 0.35% | B+ |
| All Alaska Airlines on SFO–PDX | 1,383 | 80.2% | 57 min | 0.51% | B+ |
| All carriers on SFO–PDX | 3,514 | 80.4% | 59 min | 0.34% | B+ |
| Alaska Airlines, whole network | 293,372 | 79.1% | 52 min | 1.28% | B |
Across the year
AS 525 quarter by quarter
AS 525 did not run the same all year. Its best quarter was Jan–Mar 2026 at 92.0% on time and its weakest Apr–Jun 2026 at 64.7%, a swing of 27 points on roughly 72 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 202591 flights91.2%
- Oct–Dec 202559 flights77.6%
- Jan–Mar 202687 flights92.0%
- Apr–Jun 202651 flights64.7%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 525 did best on Wednesday at 94.6% on time and worst on Sunday at 73.3%. Each day rests on about 41 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Delay causes
Why AS 525 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 81% of the 2,130 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.
- 81%Late-arriving aircraft
- 10%Carrier
- 9%National Airspace System
81% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,130 reported delay minutes here, that single category outweighs weather by 81 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,130 delay minutes reported on AS 525.
Cancellations are rare at 0.35%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 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 DEN to SEA (49), but none flew often enough under AS 525 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to PDX only.
One caution: this is a thin sample. 288 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 525
For a booking, read AS 525 as 84.0% on time with 0.35% cancelled over 288 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SFO to PDX, every carrier and departure
- PDX to SFO, the return direction
- Alaska Airlines 1410 on the same route93.7%
- Alaska Airlines 1302 on the same route75.4%
- San Francisco International (SFO) delay statistics
- Portland International (PDX) 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.