Historical on-time performance
Boston to San Antonio
1,764 miData through Dec 2025Source: US DOT · BTS
Flights on BOS–SAT arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 181 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesOn-time79%Medianon timep9040 minCancel0.6%Flights181
Why flights run late
Delay causes
- Airline56%
- Weather0%
- Air traffic (NAS)8%
- Late aircraft36%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BOS → SAT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 76% to 77% on time.
- Middays77% on time · p90 35 min · 351 flights
- Afternoons77% on time · p90 35 min · 81 flights · limited
- Mornings76% on time · p90 50 min · 605 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 81% on time.
- Wednesdays81% on time · p90 55 min · 149 flights · limited
- Mondays79% on time · p90 30 min · 155 flights · limited
- Fridays79% on time · p90 35 min · 150 flights · limited
- Thursdays78% on time · p90 35 min · 151 flights · limited
- Tuesdays75% on time · p90 35 min · 150 flights · limited
- Sundays74% on time · p90 55 min · 150 flights · limited
- Saturdays70% on time · p90 70 min · 132 flights · limited
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