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Flight Reliability

AS 442 · Alaska Airlines

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

74
Usually Fine
WanderNerd Reliability Score
73%
Arrive within 15 minutes
5 min
Average arrival delay
1.3%
Cancelled
1 min early
Median arrival delay

Based on 383 historical flights. Data through May 2026.

What the data says

Skip Monday if you can.

AS 442 arrived on time 79% of the time on Tuesdays. On Mondays: 65%.

Lagging the SEA–PHL route.

AS 442 arrived on time 73% of the time, versus 81% across the SEA–PHL route.

Lagging the Alaska Airlines network.

AS 442 arrived on time 73% of the time, versus 80% across the Alaska Airlines network.

Ticking up lately.

AS 442 arrived on time 82% of the time over the last three months in the data, compared with 79% in the three months before that.

The breakdown

On-time by weekday
  • Mon65%(54 flights)
  • Tue79%(53 flights)
  • Wed79%(53 flights)
  • Thu66%(53 flights)
  • Fri72%(54 flights)
  • Sat76%(54 flights)
  • Sun73%(55 flights)
On-time by departure window
  • 9 AM–12 PM73%(358 flights)
  • 6–9 PM72%(18 flights)
On-time trend by month
69%
May

Jun 50% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202550%30
July 202552%29
August 202568%31
September 202573%30
October 202570%30
November 202583%29
December 202584%31
January 202663%30
February 202689%28
March 202680%30
April 202697%30
May 202669%48
Departures on time
74%
Diverted
0.5%
Flights flown
376
Months covered
12

Same route, other flights

Keep nerding

Based on 383 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.