Flight number record
AS 498
Alaska Airlines · Seattle to Portland
- Route
- SEA → PDX
- Departs
- 23:15
- Flights
- 294
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 498, check with Alaska Airlines.
AS 498 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land roughly 40 minutes behind schedule. That rests on 294 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so AS 498 runs 5 points behind the country as a whole. Across a thousand flights that is about 49 extra late arrivals.
Key figures
On time
72.4%
Arrivals under 15 minutes late, of 290 completed flights
Avg delay
38 min
Across delayed arrivals only, not all flights
Cancelled
1.36%
National rate is 1.89%
1 hour+ late
4.1%
National rate is 8.3%
These figures cover 294 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Schedule
When AS 498 flies
AS 498 flies SEA to PDX without a single fixed slot. Its most common scheduled departure was 23:15, used on 72 of 294 flights, with 22:48 (69 flights) and 21:28 (68 flights) next.
- Departs 23:1572 flights24.5%
- Departs 22:4869 flights23.5%
- Departs 21:2868 flights23.1%
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 23:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and AS 498 runs 2 points better at 72.4%. 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 498 next to SEA to PDX
Every carrier on SEA to PDX combined arrived on time 82.2% of the time across 4,826 flights, so AS 498 is 10 points behind it. Alaska flew 1,202 flights on the same city pair under all its flight numbers, including this one, and those ran 76.7% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 498thin sample | 294 | 72.4% | 38 min | 1.36% | C |
| All Alaska Airlines on SEA–PDX | 1,202 | 76.7% | 42 min | 1.33% | B |
| All carriers on SEA–PDX | 4,826 | 82.2% | 49 min | 0.73% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 498 quarter by quarter
AS 498 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 42.6%, a swing of 41 points on roughly 59 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 flights83.3%
- Oct–Dec 202585 flights80.5%
- Jan–Mar 202689 flights76.4%
- Apr–Jun 202642 flights73.8%
- Jul–Sep 202648 flights42.6%
Scale runs 35% to 90%.
By weekday, AS 498 did best on Tuesday at 86.0% on time and worst on Thursday at 57.5%. Each day rests on about 42 flights, so a gap of 29 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 498 runs when it is late
The 80 late arrivals split 39 under half an hour, 29 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early24 flights8.3%
- Within 15 min186 flights64.1%
- 15–29 min late39 flights13.4%
- 30–59 min late29 flights10.0%
- 1–2 hours late10 flights3.4%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 290 completed flights by arrival against schedule.
19 of 88 late departures made up the time and arrived on time, 22% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for AS 498
The latest arrival of the period was on 2 August 2026, 3 hours 15 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 2 August 2026 | 3 hours 15 minutes | Carrier |
| 29 July 2026 | 2 hours 3 minutes | Late-arriving aircraft |
| 17 August 2026 | 1 hour 56 minutes | Late-arriving aircraft |
| 4 January 2026 | 1 hour 30 minutes | Late-arriving aircraft |
| 31 January 2026 | 1 hour 15 minutes | Carrier |
Delay causes
Why AS 498 runs late
Carrier accounts for 55% of the 3,053 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 32%Late-arriving aircraft
- 11%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,683 of the 3,053 delay minutes reported here. The split is drawn from 3,053 delay minutes reported on AS 498.
Cancellations sit at 1.36% against a national 1.89%, 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 4.1% land an hour or more behind schedule, against 8.3% 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 same number turns up on one other city pair in the data, including LAX to SFO (28), but none flew often enough under AS 498 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to PDX only.
One caution: this is a thin sample. 294 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 498
For a booking, AS 498 is one of the weaker ways to fly SEA to PDX: 10 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 PDX, every carrier and departure
- PDX to SEA, the return direction
- SkyWest Airlines 3953 on the same route93.1%
- SkyWest Airlines 3802 on the same route85.0%
- SkyWest Airlines 3913 on the same route81.2%
- SkyWest Airlines 3918 on the same route83.5%
- SkyWest Airlines 3818 on the same route87.8%
- Seattle-Tacoma International (SEA) 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.