Historical on-time performance
Seattle to San Antonio
1,774 miData through May 2026Source: US DOT · BTS
Flights on SEA–SAT arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 530 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Alaska AirlinesOn-time74%Medianon timep9035 minCancel1.1%Flights530
Why flights run late
Delay causes
- Airline38%
- Weather0%
- Air traffic (NAS)12%
- Late aircraft48%
- Security1%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline83%
- Weather0%
- Air traffic (NAS)17%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 6 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SEA → SAT
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Overnights are the most reliable time of day to fly this route — 79% on time.
- Overnights79% on time · p90 25 min · 539 flights
- Middays73% on time · p90 35 min · 1,018 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 83% on time.
- Tuesdays83% on time · p90 20 min · 220 flights
- Wednesdays79% on time · p90 20 min · 219 flights
- Thursdays78% on time · p90 35 min · 268 flights
- Mondays76% on time · p90 35 min · 250 flights
- Fridays73% on time · p90 35 min · 269 flights
- Saturdays72% on time · p90 40 min · 213 flights
- Sundays70% on time · p90 30 min · 268 flights
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