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Flight Reliability

AS 1327 · Alaska Airlines

San Francisco → Seattle (SFO–SEA)100% of its flights flew this route. The rest (SEA–LIH) are included in these numbers.

58
A Little Dicey
WanderNerd Reliability Score
61%
Arrive within 15 minutes
16 min
Average arrival delay
2.0%
Cancelled
4 min
Median arrival delay

Based on 251 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

AS 1327 arrived on time 68% of the time on Saturdays and just 51% on Fridays. That gap is worth planning around.

Lagging the SFO–SEA route.

AS 1327 arrived on time 61% of the time, versus 75% across the SFO–SEA route.

Well behind the Alaska Airlines network.

AS 1327 arrived on time 61% of the time, versus 80% across the Alaska Airlines network.

Trending in the right direction.

AS 1327 arrived on time 92% of the time over the last three months in the data, compared with 62% in the three months before that.

The breakdown

On-time by weekday
  • Mon55%(40 flights)
  • Tue62%(29 flights)
  • Wed67%(27 flights)
  • Thu67%(39 flights)
  • Fri51%(39 flights)
  • Sat68%(31 flights)
  • Sun59%(41 flights)
On-time by departure window
  • 9 AM–12 PM—(1 flights)
  • 6–9 PM60%(239 flights)
  • 9 PM–12 AM—(6 flights)
On-time trend by month
100%
Mar

Jun 21% → Mar 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202521%19
July 202528%29
August 202542%26
September 202575%16
October 202548%29
November 202569%29
December 202568%28
January 202683%29
February 202692%24
March 2026100%11
Departures on time
73%
Diverted
0%
Flights flown
246
Months covered
12

Same route, other flights

Keep nerding

Based on 251 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.