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Flight Reliability

AS 390 · Alaska Airlines

San Diego → Boston (SAN–BOS)

64
A Little Dicey
WanderNerd Reliability Score
73%
Arrive within 15 minutes
13 min
Average arrival delay
1.4%
Cancelled
1 min early
Median arrival delay

Based on 358 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

AS 390 arrived on time 93% of the time on Saturdays and just 61% on Sundays. That gap is worth planning around.

A bit behind the SAN–BOS route.

AS 390 arrived on time 73% of the time, versus 78% across the SAN–BOS route.

Lagging the Alaska Airlines network.

AS 390 arrived on time 73% of the time, versus 80% across the Alaska Airlines network.

Trending in the right direction.

AS 390 arrived on time 86% of the time over the last three months in the data, compared with 78% in the three months before that.

The breakdown

On-time by weekday
  • Mon81%(47 flights)
  • Tue67%(51 flights)
  • Wed68%(50 flights)
  • Thu73%(51 flights)
  • Fri68%(50 flights)
  • Sat93%(45 flights)
  • Sun61%(51 flights)
On-time by departure window
  • 6–9 AM72%(235 flights)
  • 9 AM–12 PM73%(110 flights)
On-time trend by month
97%
May

Jun 66% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%29
July 202563%30
August 202561%31
September 202562%29
October 202555%29
November 202572%29
December 202572%29
January 202688%25
February 202673%26
March 202675%28
April 202687%30
May 202697%30
Departures on time
71%
Diverted
2.2%
Flights flown
345
Months covered
12

Same route, other flights

Keep nerding

Based on 358 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.