Flight number record

AS 498

Alaska Airlines · Seattle to Portland

Route: SEA → PDX
Departs: 23:15
Flights: 307
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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, 6 points worse than the national rate of 77.6%. The late ones land roughly 35 minutes behind schedule. That rests on 307 flights, with a median arrival 3 minutes late.

The national on-time rate over the same period is 77.6%, so AS 498 runs 6 points behind the country as a whole. Across a thousand flights that is about 60 extra late arrivals.

On time

71.6%

Arrivals under 15 minutes late, of 303 completed flights

Avg delay

37 min

Across delayed arrivals only, not all flights

Cancelled

1.30%

National rate is 1.81%

1 hour+ late

4.0%

National rate is 8.1%

These figures cover 307 flights between July 2025 and June 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.

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 307 flights, with 22:48 (69 flights) and 23:03 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:1572 flights23.5%
Departs 22:4869 flights22.5%
Departs 23:0349 flights16.0%

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 23:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and AS 498 runs level with that at 71.6%. 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 498 next to SEA to PDX

Every carrier on SEA to PDX combined arrived on time 83.1% of the time across 4,778 flights, so AS 498 is 12 points behind it. Alaska flew 1,124 flights on the same city pair under all its flight numbers, including this one, and those ran 76.3% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight trails by 8 points.

AS 498 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 498thin sample	307	71.6%	37 min	1.30%	C
All Alaska Airlines on SEA–PDX	1,124	76.3%	41 min	1.33%	B
All carriers on SEA–PDX	4,778	83.1%	51 min	0.67%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 498 quarter by quarter

AS 498 did not run the same all year. Its best quarter was Oct–Dec 2025 at 80.5% on time and its weakest Jul–Sep 2025 at 57.8%, a swing of 23 points on roughly 77 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 flights57.8%
Oct–Dec 202585 flights80.5%
Jan–Mar 202689 flights76.4%
Apr–Jun 202642 flights73.8%

Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, AS 498 did best on Tuesday at 84.4% on time and worst on Thursday at 57.1%. Each day rests on about 44 flights, so a gap of 27 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 498 runs late

One category carries most of the weight here. Carrier accounts for 53% of the 3,144 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.

Carrier
53%
Late-arriving aircraft
36%
National Airspace System
10%
Extreme weather
1%

36% 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 3,144 reported delay minutes here, that single category outweighs weather by 24 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 3,144 delay minutes reported on AS 498.

Cancellations sit at 1.30% 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 4.0% 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 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. 307 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: 12 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.

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