Flight number record
AS 473
Alaska Airlines · St. Louis to Seattle
- Route
- STL → SEA
- Departs
- 07:00
- Flights
- 321
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs about an hour. That rests on 321 flights, with a median arrival 11 minutes early.
Set against the rest of the country, AS 473's record is 13 points better than the US average of 77.3%. That gap is worth roughly 127 fewer late arrivals for every thousand flights.
Key figures
On time
90.0%
Arrivals under 15 minutes late, of 319 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.62%
National rate is 1.89%
1 hour+ late
1.3%
National rate is 8.3%
These figures cover 321 flights between September 2025 and August 2026. The median arrival is 11 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 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 06:02 (70 flights) and 06:00 (61 flights) next.
- Departs 07:00155 flights48.3%
- Departs 06:0270 flights21.8%
- Departs 06:0061 flights19.0%
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 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 90.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
AS 473 next to STL to SEA
Every carrier on STL to SEA combined arrived on time 78.6% of the time across 884 flights, so AS 473 is 11 points ahead of it. Alaska flew 781 flights on the same city pair under all its flight numbers, including this one, and those ran 82.5% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 473thin sample | 321 | 90.0% | 58 min | 0.62% | A+ |
| All Alaska Airlines on STL–SEA | 781 | 82.5% | 50 min | 1.02% | B |
| All carriers on STL–SEA | 884 | 78.6% | 46 min | 0.90% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | 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 64 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 flights90.0%
- Oct–Dec 202592 flights84.6%
- Jan–Mar 202646 flights88.9%
- Apr–Jun 202691 flights95.6%
- Jul–Sep 202662 flights90.3%
Scale runs 75% to 100%.
By weekday, AS 473 ranged from 87.2% on Tuesday to 93.5% on Thursday. With about 46 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late AS 473 runs when it is late
AS 473 often beats the schedule: 122 of 319 completed flights, 38%, arrived 15 minutes or more early. The 32 late arrivals split 14 under half an hour, 14 between 30 and 60 minutes, and 4 an hour or more.
- 15+ min early122 flights38.2%
- Within 15 min165 flights51.7%
- 15–29 min late14 flights4.4%
- 30–59 min late14 flights4.4%
- 1–2 hours late1 flights0.3%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 319 completed flights by arrival against schedule.
3 of 21 late departures made up the time and arrived on time, 14% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for AS 473
The latest arrival of the period was on 16 April 2026, 8 hours 42 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 national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 April 2026 | 8 hours 42 minutes | Carrier |
| 2 December 2025 | 3 hours | National Airspace System |
| 17 July 2026 | 2 hours 37 minutes | National Airspace System |
| 20 December 2025 | 1 hour 17 minutes | Carrier |
| 4 November 2025 | 57 minutes | National Airspace System |
Delay causes
Why AS 473 runs late
Carrier accounts for 51% of the 1,850 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 41%National Airspace System
- 7%Extreme weather
- 1%Security
41% 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 764 minutes out of 1,850, against a national NAS share of 21%. The split is drawn from 1,850 delay minutes reported on AS 473.
Cancellations are rare at 0.62%, 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
Badly late arrivals are rare here: only 1.3% 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.
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: 90.0% on time and 0.62% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- STL to SEA, every carrier and departure
- SEA to STL, the return direction
- St. Louis Lambert International (STL) delay statistics
- Seattle-Tacoma International (SEA) 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
- Worst months to fly in the US, ranked by the data
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.