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Flight Reliability

AS 477 · Alaska Airlines

Seattle → Newark (SEA–EWR)97% of its flights flew this route. The rest (EWR–SEA) are included in these numbers.

66
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
10 min
Average arrival delay
2.9%
Cancelled
2 min early
Median arrival delay

Based on 343 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

AS 477 departing between 12–3 PM arrived on time 95% of the time, versus 70% between 6–9 PM.

Saturdays have been rough.

AS 477 arrived on time 80% of the time on Wednesdays and just 63% on Saturdays. That gap is worth planning around.

Lagging the SEA–EWR route.

AS 477 arrived on time 72% of the time, versus 81% across the SEA–EWR route.

Lagging the Alaska Airlines network.

AS 477 arrived on time 72% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon73%(48 flights)
  • Tue80%(49 flights)
  • Wed80%(46 flights)
  • Thu66%(47 flights)
  • Fri71%(49 flights)
  • Sat63%(48 flights)
  • Sun71%(44 flights)
On-time by departure window
  • 9 AM–12 PM70%(300 flights)
  • 12–3 PM95%(21 flights)
  • 6–9 PM70%(10 flights)
On-time trend by month
90%
May

Jun 66% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%29
July 202539%28
August 202560%30
September 202583%30
October 202552%29
November 202570%27
December 202571%31
January 202680%30
February 202685%26
March 202684%31
April 202695%21
May 202690%19
Departures on time
70%
Diverted
0.6%
Flights flown
331
Months covered
12

Same route, other flights

Keep nerding

Based on 343 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.