Historical on-time performance
San Antonio to Boston
1,764 miData through Dec 2025Source: US DOT · BTS
Flights on SAT–BOS arrive on time 49% of the time over the last 12 months.
On-time rate49%arrived within 15 min
p90 delay120 min1 in 10 flights is worse (tail risk)
Cancelled1.1%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-time49%Median15 minp90120 minCancel1.1%Flights181
Why flights run late
Delay causes
- Airline7%
- Weather11%
- Air traffic (NAS)64%
- Late aircraft19%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SAT → BOS
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 62% to 66% on time.
- Evenings66% on time · p90 75 min · 123 flights · limited
- Afternoons65% on time · p90 80 min · 464 flights
- Middays62% on time · p90 90 min · 450 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 57% to 70% on time.
- Wednesdays70% on time · p90 115 min · 149 flights · limited
- Saturdays67% on time · p90 80 min · 132 flights · limited
- Tuesdays64% on time · p90 70 min · 150 flights · limited
- Sundays64% on time · p90 80 min · 150 flights · limited
- Mondays63% on time · p90 75 min · 155 flights · limited
- Thursdays62% on time · p90 90 min · 151 flights · limited
- Fridays57% on time · p90 95 min · 150 flights · limited
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