Historical on-time performance
Atlanta to San Antonio
874 miData through May 2026Source: US DOT · BTS
Flights on ATL–SAT arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights
based on 2,855 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesbestOn-time84%Medianon timep9025 minCancel0.0%Flights214
- Delta Air LinesOn-time78%Medianon timep9035 minCancel1.6%Flights2,611
- Spirit AirlinesOn-time77%Medianon timep9035 minCancel0.0%Flights30
Why flights run late
Delay causes
- Airline46%
- Weather6%
- Air traffic (NAS)18%
- Late aircraft30%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline76%
- Weather24%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 42 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 ATL → SAT
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 15 min · 2,244 flights
- Middays81% on time · p90 25 min · 2,039 flights
- Afternoons77% on time · p90 35 min · 1,935 flights
- Overnights72% on time · p90 55 min · 1,985 flights
- Evenings70% on time · p90 55 min · 995 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 83% on time.
- Wednesdays83% on time · p90 25 min · 1,253 flights
- Tuesdays81% on time · p90 30 min · 1,271 flights
- Saturdays79% on time · p90 35 min · 1,137 flights
- Fridays78% on time · p90 35 min · 1,399 flights
- Thursdays78% on time · p90 35 min · 1,379 flights
- Mondays77% on time · p90 40 min · 1,396 flights
- Sundays73% on time · p90 50 min · 1,363 flights
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