Historical on-time performance
Denver to San Antonio
794 miData through Dec 2025Source: US DOT · BTS
Flights on DEN–SAT arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 2,802 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- SkyWest AirlinesOn-time55%Medianon timep90110 minCancel9.7%Flights31
- United AirlinesOn-time78%Medianon timep9040 minCancel0.2%Flights1,201
- Frontier AirlinesbestOn-time87%Medianon timep9015 minCancel0.0%Flights114
- Southwest AirlinesOn-time72%Medianon timep9055 minCancel0.5%Flights1,456
Why flights run late
Delay causes
- Airline27%
- Weather1%
- Air traffic (NAS)11%
- Late aircraft61%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly DEN → SAT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 20 min · 2,424 flights
- Middays82% on time · p90 25 min · 2,433 flights
- Evenings67% on time · p90 70 min · 1,857 flights
- Afternoons66% on time · p90 55 min · 1,045 flights
- Overnights64% on time · p90 70 min · 1,533 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 78% on time.
- Mondays78% on time · p90 40 min · 1,371 flights
- Tuesdays77% on time · p90 35 min · 1,297 flights
- Saturdays76% on time · p90 40 min · 1,208 flights
- Wednesdays75% on time · p90 45 min · 1,250 flights
- Sundays75% on time · p90 50 min · 1,372 flights
- Fridays74% on time · p90 45 min · 1,372 flights
- Thursdays72% on time · p90 50 min · 1,422 flights
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