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Flight Reliability

AS 401 · Alaska Airlines

Phoenix → Seattle (PHX–SEA)84% of its flights flew this route. The rest (SEA–IAD, SEA–DTW) are included in these numbers.

95
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
2 min early
Average arrival delay
0.4%
Cancelled
9 min early
Median arrival delay

Based on 252 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AS 401 departing between 9 PM–12 AM arrived on time 91% of the time, versus 60% between 12–3 PM.

Friday is doing you no favors.

AS 401 arrived on time 95% of the time on Sundays. On Fridays: 83%.

A bit ahead of the PHX–SEA route.

AS 401 arrived on time 88% of the time, versus 84% across the PHX–SEA route.

Better than the Alaska Airlines network average.

AS 401 arrived on time 88% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon89%(37 flights)
  • Tue92%(37 flights)
  • Wed86%(36 flights)
  • Thu85%(34 flights)
  • Fri83%(35 flights)
  • Sat89%(35 flights)
  • Sun95%(37 flights)
On-time by departure window
  • 9 AM–12 PM83%(29 flights)
  • 12–3 PM60%(10 flights)
  • 3–6 PM91%(201 flights)
  • 9 PM–12 AM91%(11 flights)
On-time trend by month
81%
May

Jun 91% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202591%11
September 202585%26
November 202596%26
December 202593%30
January 202690%31
February 202689%27
March 202683%30
April 202697%30
May 202681%31
Departures on time
86%
Diverted
0%
Flights flown
251
Months covered
10

Same route, other flights

Keep nerding

Based on 252 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.