Flight number record

AS 473

Alaska Airlines · St. Louis to Seattle

Route: STL → SEA
Departs: 07:00
Flights: 321
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 473, check with Alaska Airlines.

AS 473 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 321 flights, with a median arrival 10 minutes early.

Set against the rest of the country, AS 473's record is 13 points better than the US average of 77.6%. That gap is worth roughly 127 fewer late arrivals for every thousand flights.

On time

90.3%

Arrivals under 15 minutes late, of 318 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

0.93%

National rate is 1.81%

1 hour+ late

0.9%

National rate is 8.1%

These figures cover 321 flights between July 2025 and June 2026. The median arrival is 10 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 473 flies

AS 473 flies STL to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 155 of 321 flights, with 06:00 (73 flights) and 06:41 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00155 flights48.3%
Departs 06:0073 flights22.7%
Departs 06:4150 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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 473 runs level with that at 90.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

AS 473 next to STL to SEA

Every carrier on STL to SEA combined arrived on time 77.6% of the time across 884 flights, so AS 473 is 13 points ahead of it. Alaska flew 781 flights on the same city pair under all its flight numbers, including this one, and those ran 80.7% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 11 points.

AS 473 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 473thin sample	321	90.3%	57 min	0.93%	A+
All Alaska Airlines on STL–SEA	781	80.7%	49 min	1.02%	B
All carriers on STL–SEA	884	77.6%	48 min	0.90%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 473 quarter by quarter

AS 473 did not run the same all year. Its best quarter was Apr–Jun 2026 at 95.6% on time and its weakest Oct–Dec 2025 at 84.6%, a swing of 11 points on roughly 80 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 202592 flights91.2%
Oct–Dec 202592 flights84.6%
Jan–Mar 202646 flights88.9%
Apr–Jun 202691 flights95.6%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, AS 473 ranged from 87.5% on Tuesday to 91.5% on Friday. With about 46 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why AS 473 runs late

One category carries most of the weight here. Carrier accounts for 60% of the 1,751 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
60%
National Airspace System
33%
Extreme weather
6%
Security
1%

33% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 584 minutes out of 1,751, against a national NAS share of 21%. The split is drawn from 1,751 delay minutes reported on AS 473.

Cancellations sit at 0.93% 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 0.9% 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.

At 1,709 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The same number turns up on one other city pair in the data, including PIT to SEA (1), but none flew often enough under AS 473 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to STL to SEA only.

One caution: this is a thin sample. 321 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 473

For a booking, AS 473 has one of the better records a US domestic flight can show: 90.3% on time and 0.93% cancelled. That is a base rate, not a promise about any single day.

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