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Flight Reliability

AS 430 · Alaska Airlines

Seattle → Salt Lake City (SEA–SLC)95% of its flights flew this route. The rest (DEN–PDX) are included in these numbers.

91
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
4 min early
Average arrival delay
2.0%
Cancelled
8 min early
Median arrival delay

Based on 244 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

AS 430 departing between 6–9 AM arrived on time 94% of the time, versus 55% between 9 AM–12 PM.

Tuesday is the weak spot.

AS 430 arrived on time 100% of the time on Saturdays. On Tuesdays: 86%.

Better than the SEA–SLC route average.

AS 430 arrived on time 92% of the time, versus 84% across the SEA–SLC route.

Better than the Alaska Airlines network average.

AS 430 arrived on time 92% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon94%(48 flights)
  • Tue86%(21 flights)
  • Wed90%(19 flights)
  • Thu92%(47 flights)
  • Fri91%(46 flights)
  • Sat100%(29 flights)
  • Sun93%(28 flights)
On-time by departure window
  • 6–9 AM94%(227 flights)
  • 9 AM–12 PM55%(11 flights)
On-time trend by month
95%
May

Jun 74% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%19
July 202585%13
August 2025100%15
September 202594%17
October 2025100%17
November 2025100%10
December 202587%31
January 202696%24
February 202696%23
March 202690%29
April 2026100%21
May 202695%19
Departures on time
93%
Diverted
0.4%
Flights flown
238
Months covered
12

Same route, other flights

Keep nerding

Based on 244 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.