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Flight Reliability

AS 142 · Alaska Airlines

Juneau → Seattle (JNU–SEA)81% of its flights flew this route. The rest (HNL–SEA, ANC–FAI) are included in these numbers.

70
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
12 min
Average arrival delay
2.9%
Cancelled
1 min
Median arrival delay

Based on 312 historical flights. Data through May 2026.

What the data says

The 3–6 AM departure wins.

AS 142 departing between 3–6 AM arrived on time 100% of the time, versus 73% between 6–9 AM.

Mondays have been rough.

AS 142 arrived on time 87% of the time on Sundays and just 65% on Mondays. That gap is worth planning around.

A bit behind the JNU–SEA route.

AS 142 arrived on time 75% of the time, versus 80% across the JNU–SEA route.

A bit behind the Alaska Airlines network.

AS 142 arrived on time 75% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon65%(43 flights)
  • Tue74%(46 flights)
  • Wed80%(40 flights)
  • Thu72%(43 flights)
  • Fri74%(42 flights)
  • Sat75%(44 flights)
  • Sun87%(45 flights)
On-time by departure window
  • 3–6 AM100%(10 flights)
  • 6–9 AM73%(253 flights)
  • 9 PM–12 AM83%(40 flights)
On-time trend by month
81%
May

Jun 86% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%29
July 202573%30
August 202558%19
October 202582%27
November 202583%29
December 202564%25
January 202676%29
February 202682%27
March 202653%30
April 202685%27
May 202681%31
Departures on time
87%
Diverted
0%
Flights flown
303
Months covered
11

Same route, other flights

Keep nerding

Based on 312 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.