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Flight Reliability

AS 603 · Alaska Airlines

Phoenix → Seattle (PHX–SEA)

97
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
3 min early
Average arrival delay
0.3%
Cancelled
12 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

AS 603 arrived on time 94% of the time on Wednesdays. On Fridays: 84%.

A bit ahead of the PHX–SEA route.

AS 603 arrived on time 90% of the time, versus 84% across the PHX–SEA route.

Better than the Alaska Airlines network average.

AS 603 arrived on time 90% of the time, versus 80% across the Alaska Airlines network.

It basically never cancels.

Out of 346 scheduled flights, only 0.3% were cancelled.

The breakdown

On-time by weekday
  • Mon89%(52 flights)
  • Tue90%(52 flights)
  • Wed94%(52 flights)
  • Thu92%(50 flights)
  • Fri84%(49 flights)
  • Sat91%(42 flights)
  • Sun94%(48 flights)
On-time by departure window
  • 9 AM–12 PM92%(136 flights)
  • 12–3 PM90%(209 flights)
On-time trend by month
96%
May

Jun 97% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%29
July 202594%31
August 202593%30
September 202590%29
October 202581%31
November 202593%30
December 202593%28
January 202675%28
February 202689%26
March 202686%29
April 2026100%26
May 202696%28
Departures on time
90%
Diverted
0%
Flights flown
345
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.