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Flight Reliability

AS 473 · Alaska Airlines

St. Louis → Seattle (STL–SEA)100% of its flights flew this route. The rest (PIT–SEA) are included in these numbers.

95
Nerd Approved
WanderNerd Reliability Score
91%
Arrive within 15 minutes
5 min early
Average arrival delay
1.0%
Cancelled
10 min early
Median arrival delay

Based on 311 historical flights. Data through May 2026.

What the data says

Skip Wednesday if you can.

AS 473 arrived on time 96% of the time on Thursdays. On Wednesdays: 89%.

Better than the STL–SEA route average.

AS 473 arrived on time 91% of the time, versus 78% across the STL–SEA route.

Better than the Alaska Airlines network average.

AS 473 arrived on time 91% of the time, versus 80% across the Alaska Airlines network.

Trending in the right direction.

AS 473 arrived on time 95% of the time over the last three months in the data, compared with 81% in the three months before that.

The breakdown

On-time by weekday
  • Mon91%(44 flights)
  • Tue89%(45 flights)
  • Wed89%(44 flights)
  • Thu96%(46 flights)
  • Fri91%(46 flights)
  • Sat89%(37 flights)
  • Sun91%(46 flights)
On-time trend by month
100%
May

Jun 95% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202595%19
July 202593%30
August 202594%31
September 202590%30
October 2025100%31
November 202597%29
December 202561%31
February 202686%14
March 202692%26
April 202693%30
May 2026100%31
Departures on time
93%
Diverted
0%
Flights flown
308
Months covered
12

Same route, other flights

Keep nerding

Based on 311 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.