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Route Reliability

Seattle → San Antonio

SEA–SAT · 1,774 miles · Seattle–Tacoma International Airport to San Antonio International Airport

79
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
4 min
Average arrival delay
1.1%
Cancelled
558
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 76% of the time across 558 flights. No comparison to make.

What the data says

The 3–6 PM departure wins.

SEA–SAT flights departing between 3–6 PM arrived on time 82% of the time, versus 67% between 12–3 PM.

Sunday scaries are real for this one.

SEA–SAT flights arrived on time 84% of the time on Tuesdays. On Sundays: 70%.

Trending in the right direction.

SEA–SAT flights arrived on time 85% of the time over the last three months in the data, compared with 75% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon75%(84 flights)
  • Tue84%(74 flights)
  • Wed83%(70 flights)
  • Thu81%(83 flights)
  • Fri72%(83 flights)
  • Sat72%(71 flights)
  • Sun70%(86 flights)
On-time by departure window
  • 9 AM–12 PM80%(211 flights)
  • 12–3 PM67%(150 flights)
  • 3–6 PM82%(51 flights)
  • 6–9 PM79%(14 flights)
  • 9 PM–12 AM79%(125 flights)
On-time trend by month
92%
May

Jun 63% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202563%60
July 202562%60
August 202571%55
September 202594%47
October 202583%52
November 202577%48
December 202569%52
January 202668%37
February 202689%28
March 202674%31
April 202690%30
May 202692%51

Keep nerding

Based on 558 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.