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Flight Reliability

AS 389 · Alaska Airlines

Boston → San Diego (BOS–SAN)

64
A Little Dicey
WanderNerd Reliability Score
65%
Arrive within 15 minutes
12 min
Average arrival delay
1.3%
Cancelled
2 min
Median arrival delay

Based on 314 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

AS 389 departing between 3–6 PM arrived on time 66% of the time, versus 53% between 6–9 PM.

Sunday scaries are real for this one.

AS 389 arrived on time 74% of the time on Tuesdays and just 58% on Sundays. That gap is worth planning around.

Lagging the BOS–SAN route.

AS 389 arrived on time 65% of the time, versus 79% across the BOS–SAN route.

Well behind the Alaska Airlines network.

AS 389 arrived on time 65% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon65%(48 flights)
  • Tue74%(42 flights)
  • Wed66%(38 flights)
  • Thu69%(48 flights)
  • Fri58%(48 flights)
  • Sat68%(34 flights)
  • Sun58%(50 flights)
On-time by departure window
  • 6–9 AM64%(11 flights)
  • 3–6 PM66%(267 flights)
  • 6–9 PM53%(30 flights)
On-time trend by month
68%
May

Jun 57% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%30
July 202530%30
August 202554%26
September 202559%17
October 202556%18
November 202580%20
December 202580%25
January 202675%24
February 202673%26
March 202671%31
April 202680%30
May 202668%31
Departures on time
70%
Diverted
0.6%
Flights flown
308
Months covered
12

Same route, other flights

Keep nerding

Based on 314 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.