Flight number record
AS 235
Alaska Airlines · San Francisco to Portland
- Route
- SFO → PDX
- Departs
- 12:08
- Flights
- 287
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 235, check with Alaska Airlines.
AS 235 draws a D+. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is about 50 minutes behind schedule. Build slack into anything you connect to. That rests on 287 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.3%, so AS 235 runs 19 points behind the country as a whole. Across a thousand flights that is about 186 extra late arrivals.
Key figures
On time
58.7%
Arrivals under 15 minutes late, of 286 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.35%
National rate is 1.89%
1 hour+ late
10.1%
National rate is 8.3%
These figures cover 287 flights between September 2025 and August 2026. Beyond the headline rate, 10.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When AS 235 flies
AS 235 flies SFO to PDX without a single fixed slot. Its most common scheduled departure was 12:08, used on 60 of 287 flights, with 11:36 (52 flights) and 11:56 (41 flights) next.
- Departs 12:0860 flights20.9%
- Departs 11:3652 flights18.1%
- Departs 11:5641 flights14.3%
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 12:08 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and AS 235 runs 20 points worse at 58.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
AS 235 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 235 is 19 points behind 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%, which this flight trails by 21 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 235thin sample | 287 | 58.7% | 51 min | 0.35% | D+ |
| 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 235 quarter by quarter
AS 235 did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.0% on time and its weakest Jul–Sep 2026 at 30.9%, a swing of 57 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.
- Oct–Dec 202562 flights67.7%
- Jan–Mar 202684 flights88.0%
- Apr–Jun 202686 flights41.9%
- Jul–Sep 202655 flights30.9%
Scale runs 20% to 95%.
By weekday, AS 235 did best on Tuesday at 68.2% on time and worst on Monday at 47.7%. Each day rests on about 41 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 235 runs when it is late
The 118 late arrivals split 35 under half an hour, 54 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early68 flights23.8%
- Within 15 min100 flights35.0%
- 15–29 min late35 flights12.2%
- 30–59 min late54 flights18.9%
- 1–2 hours late24 flights8.4%
- 2+ hours late5 flights1.7%
Scale runs 0% to 100%.
Share of 286 completed flights by arrival against schedule.
16 of 126 late departures made up the time and arrived on time, 13% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for AS 235
The latest arrival of the period was on 16 December 2025, 5 hours 1 minute behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Four of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 December 2025 | 5 hours 1 minute | Carrier |
| 30 January 2026 | 4 hours 4 minutes | Carrier |
| 19 December 2025 | 4 hours | Late-arriving aircraft |
| 12 December 2025 | 3 hours 22 minutes | Late-arriving aircraft |
| 23 December 2025 | 3 hours 10 minutes | Late-arriving aircraft |
Delay causes
Why AS 235 runs late
Late-arriving aircraft accounts for 72% of the 5,996 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Late-arriving aircraft
- 18%Carrier
- 10%National Airspace System
72% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,996 reported delay minutes here, that single category outweighs weather by 72 to one. The split is drawn from 5,996 delay minutes reported on AS 235.
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
10.1% 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 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 SEA to ORD (1), but none flew often enough under AS 235 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 235
For a booking, AS 235 is one of the weaker ways to fly SFO to PDX: 19 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
- 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 525 on the same route78.7%
- 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.