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Flight Reliability

AS 426 · Alaska Airlines

Seattle → Dallas–Fort Worth (SEA–DFW)86% of its flights flew this route. The rest (SEA–GEG, DEN–SEA) are included in these numbers.

76
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
9 min
Average arrival delay
0.9%
Cancelled
1 min
Median arrival delay

Based on 318 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AS 426 departing between 9 PM–12 AM arrived on time 78% of the time, versus 27% between 12–3 PM.

Sunday scaries are real for this one.

AS 426 arrived on time 79% of the time on Wednesdays. On Sundays: 68%.

A bit behind the SEA–DFW route.

AS 426 arrived on time 72% of the time, versus 77% across the SEA–DFW route.

Lagging the Alaska Airlines network.

AS 426 arrived on time 72% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon70%(47 flights)
  • Tue78%(46 flights)
  • Wed79%(47 flights)
  • Thu68%(47 flights)
  • Fri70%(46 flights)
  • Sat69%(35 flights)
  • Sun68%(47 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM72%(230 flights)
  • 12–3 PM27%(11 flights)
  • 9 PM–12 AM78%(73 flights)
On-time trend by month
83%
May

Jun 47% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202547%30
July 202560%30
August 202562%29
September 202576%25
October 202582%27
November 202583%30
December 202563%30
January 202683%29
February 202682%28
March 202653%17
April 2026100%10
May 202683%30
Departures on time
74%
Diverted
0%
Flights flown
315
Months covered
12

Same route, other flights

Keep nerding

Based on 318 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.