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Flight Reliability

AS 478 · Alaska Airlines

Seattle → Las Vegas (SEA–LAS)97% of its flights flew this route. The rest (SAN–ATL) are included in these numbers.

74
Usually Fine
WanderNerd Reliability Score
71%
Arrive within 15 minutes
9 min
Average arrival delay
0.9%
Cancelled
2 min
Median arrival delay

Based on 330 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AS 478 departing between 6–9 PM arrived on time 73% of the time, versus 40% between 9 PM–12 AM.

Sunday scaries are real for this one.

AS 478 arrived on time 82% of the time on Wednesdays and just 61% on Sundays. That gap is worth planning around.

A bit behind the SEA–LAS route.

AS 478 arrived on time 71% of the time, versus 77% across the SEA–LAS route.

Lagging the Alaska Airlines network.

AS 478 arrived on time 71% of the time, versus 80% across the Alaska Airlines network.

The breakdown

On-time by weekday
  • Mon75%(51 flights)
  • Tue75%(40 flights)
  • Wed82%(38 flights)
  • Thu68%(50 flights)
  • Fri68%(50 flights)
  • Sat72%(46 flights)
  • Sun61%(51 flights)
On-time by departure window
  • 9 AM–12 PM73%(11 flights)
  • 6–9 PM73%(295 flights)
  • 9 PM–12 AM40%(20 flights)
On-time trend by month
82%
May

Jun 63% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%30
July 202555%29
August 202573%30
September 202567%30
October 202578%27
November 202563%19
December 202565%31
January 202679%24
February 202667%24
March 202681%31
April 202679%29
May 202682%22
Departures on time
72%
Diverted
0.3%
Flights flown
326
Months covered
12

Same route, other flights

Keep nerding

Based on 330 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.