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Flight Reliability

AS 351 · Alaska Airlines

Washington → Seattle (IAD–SEA)90% of its flights flew this route. The rest (FAI–ANC) are included in these numbers.

86
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
1 min
Average arrival delay
0.6%
Cancelled
8 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

AS 351 departing between 6–9 AM arrived on time 81% of the time, versus 60% between 6–9 PM.

Tuesday is the weak spot.

AS 351 arrived on time 84% of the time on Thursdays. On Tuesdays: 77%.

A bit ahead of the IAD–SEA route.

AS 351 arrived on time 81% of the time, versus 77% across the IAD–SEA route.

Trending in the right direction.

AS 351 arrived on time 85% of the time over the last three months in the data, compared with 61% in the three months before that.

The breakdown

On-time by weekday
  • Mon79%(52 flights)
  • Tue77%(52 flights)
  • Wed82%(51 flights)
  • Thu84%(51 flights)
  • Fri80%(51 flights)
  • Sat81%(52 flights)
  • Sun80%(51 flights)
On-time by departure window
  • 3–6 AM81%(36 flights)
  • 6–9 AM81%(314 flights)
  • 6–9 PM60%(10 flights)
On-time trend by month
97%
May

Jun 79% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%29
July 202597%31
August 2025100%31
September 202597%30
October 202587%30
November 202569%29
December 202530%30
January 202668%31
February 202685%27
March 202671%31
April 202687%30
May 202697%31
Departures on time
89%
Diverted
0%
Flights flown
360
Months covered
12

Same route, other flights

Keep nerding

Based on 362 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.