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Flight Reliability

AS 443 · Alaska Airlines

Philadelphia → Seattle (PHL–SEA)95% of its flights flew this route. The rest (DFW–SEA) are included in these numbers.

51
A Little Dicey
WanderNerd Reliability Score
57%
Arrive within 15 minutes
21 min
Average arrival delay
1.7%
Cancelled
7 min
Median arrival delay

Based on 361 historical flights. Data through May 2026.

What the data says

Thursdays have been rough.

AS 443 arrived on time 71% of the time on Tuesdays and just 43% on Thursdays. That gap is worth planning around.

Lagging the PHL–SEA route.

AS 443 arrived on time 57% of the time, versus 69% across the PHL–SEA route.

Well behind the Alaska Airlines network.

AS 443 arrived on time 57% of the time, versus 80% across the Alaska Airlines network.

Recent months have been rougher.

AS 443 arrived on time 60% of the time over the last three months in the data, compared with 70% in the three months before that.

The breakdown

On-time by weekday
  • Mon55%(51 flights)
  • Tue71%(52 flights)
  • Wed55%(51 flights)
  • Thu43%(49 flights)
  • Fri52%(48 flights)
  • Sat56%(52 flights)
  • Sun65%(51 flights)
On-time trend by month
63%
May

Jun 27% → May 63% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202527%30
July 202525%28
August 202555%31
September 202563%30
October 202557%30
November 202568%28
December 202548%31
January 202673%30
February 202689%27
March 202640%30
April 202676%29
May 202663%30
Departures on time
67%
Diverted
0.3%
Flights flown
354
Months covered
12

Same route, other flights

Keep nerding

Based on 361 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.