Historical on-time performance
Detroit to San Antonio
1,215 miData through May 2026Source: US DOT · BTS
Flights on DTW–SAT arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 935 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesOn-time80%Medianon timep9040 minCancel0.7%Flights935
Why flights run late
Delay causes
- Airline57%
- Weather3%
- Air traffic (NAS)23%
- Late aircraft17%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline71%
- Weather29%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 7 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 DTW → 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 — 85% on time.
- Mornings85% on time · p90 25 min · 1,040 flights
- Middays81% on time · p90 40 min · 661 flights
- Afternoons79% on time · p90 30 min · 131 flights · limited
- Overnights73% on time · p90 50 min · 881 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 84% on time.
- Tuesdays84% on time · p90 25 min · 401 flights
- Wednesdays82% on time · p90 30 min · 400 flights
- Thursdays81% on time · p90 30 min · 412 flights
- Mondays79% on time · p90 45 min · 427 flights
- Fridays79% on time · p90 45 min · 424 flights
- Saturdays78% on time · p90 35 min · 325 flights
- Sundays76% on time · p90 50 min · 412 flights
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