Skip to content
WanderNerd
Check a flight

Flight Reliability

AS 1284 · Alaska Airlines

Seattle → San Francisco (SEA–SFO)

59
A Little Dicey
WanderNerd Reliability Score
60%
Arrive within 15 minutes
21 min
Average arrival delay
0.8%
Cancelled
8 min
Median arrival delay

Based on 132 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

AS 1284 departing between 3–6 PM arrived on time 61% of the time, versus 40% between 9 AM–12 PM.

Friday is doing you no favors.

AS 1284 arrived on time 79% of the time on Tuesdays and just 48% on Fridays. That gap is worth planning around.

Lagging the SEA–SFO route.

AS 1284 arrived on time 60% of the time, versus 70% across the SEA–SFO route.

Well behind the Alaska Airlines network.

AS 1284 arrived on time 60% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon60%(20 flights)
  • Tue79%(19 flights)
  • Wed57%(21 flights)
  • Thu52%(21 flights)
  • Fri48%(21 flights)
  • Sat67%(18 flights)
  • Sun55%(11 flights)
On-time by departure window
  • 9 AM–12 PM40%(10 flights)
  • 3–6 PM61%(121 flights)
On-time trend by month
68%
Oct

Jun 54% → Oct 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202554%28
July 202570%30
August 202548%25
September 202558%26
October 202568%22
Departures on time
63%
Diverted
0%
Flights flown
131
Months covered
5

Same route, other flights

Keep nerding

Based on 132 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.