Flight number record
AS 525
Alaska Airlines · San Francisco to Portland
- Route
- SFO → PDX
- Departs
- 18:40
- Flights
- 287
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 525, check with Alaska Airlines.
AS 525 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That rests on 287 flights, with a median arrival 5 minutes early.
Key figures
On time
78.7%
Arrivals under 15 minutes late, of 286 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
0.35%
National rate is 1.89%
1 hour+ late
5.2%
National rate is 8.3%
These figures cover 287 flights between September 2025 and August 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.
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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 287 flights, with 18:59 (48 flights) and 18:46 (48 flights) next.
- Departs 18:4064 flights22.3%
- Departs 18:5948 flights16.7%
- Departs 18:4648 flights16.7%
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 18:40 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 525 runs 11 points better at 78.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 525 next to SFO to PDX
Every carrier on SFO to PDX combined arrived on time 78.0% of the time across 3,491 flights, so AS 525 is about level with it. Alaska flew 1,402 flights on the same city pair under all its flight numbers, including this one, and those ran 76.8% on time. Across its whole network Alaska Airlines managed 79.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 525thin sample | 287 | 78.7% | 48 min | 0.35% | B+ |
| All Alaska Airlines on SFO–PDX | 1,402 | 76.8% | 55 min | 0.57% | B+ |
| All carriers on SFO–PDX | 3,491 | 78.0% | 59 min | 0.32% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 525 quarter by quarter
AS 525 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jul–Sep 2026 at 61.7%, a swing of 38 points on roughly 57 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 202530 flights100.0%
- Oct–Dec 202559 flights77.6%
- Jan–Mar 202687 flights92.0%
- Apr–Jun 202651 flights64.7%
- Jul–Sep 202660 flights61.7%
Scale runs 55% to 100%.
By weekday, AS 525 did best on Wednesday at 94.6% on time and worst on Thursday at 58.5%. Each day rests on about 41 flights, so a gap of 36 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 525 runs when it is late
The 61 late arrivals split 23 under half an hour, 23 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early68 flights23.8%
- Within 15 min157 flights54.9%
- 15–29 min late23 flights8.0%
- 30–59 min late23 flights8.0%
- 1–2 hours late12 flights4.2%
- 2+ hours late3 flights1.0%
Scale runs 0% to 100%.
Share of 286 completed flights by arrival against schedule.
18 of 76 late departures made up the time and arrived on time, 24% of them. Only 3 left on time and still arrived late.
The worst days
Worst days for AS 525
The latest arrival of the period was on 23 December 2025, 3 hours 54 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 December 2025 | 3 hours 54 minutes | Late-arriving aircraft |
| 24 August 2026 | 2 hours 32 minutes | Late-arriving aircraft |
| 16 July 2026 | 2 hours 12 minutes | Late-arriving aircraft |
| 19 February 2026 | 1 hour 59 minutes | Late-arriving aircraft |
| 26 December 2025 | 1 hour 45 minutes | Late-arriving aircraft |
Delay causes
Why AS 525 runs late
Late-arriving aircraft accounts for 87% of the 2,896 delay minutes carriers reported here, and the remaining four split what is left.
- 87%Late-arriving aircraft
- 7%Carrier
- 6%National Airspace System
87% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,896 reported delay minutes here, that single category outweighs weather by 87 to one. The split is drawn from 2,896 delay minutes reported on AS 525.
Cancellations are rare at 0.35%, below the national 1.89% 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
5.2% 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 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.
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. 287 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 78.7% on time with 0.35% cancelled over 287 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 1302 on the same route72.4%
- Alaska Airlines 1410 on the same route94.6%
- Alaska Airlines 235 on the same route58.7%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.