Historical on-time performance
Denver to San Antonio
Flights on DEN–SAT arrive on time 76% of the time over the last 12 months.
based on 2,866 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Frontier AirlinesOn-time83%Medianon timep9035 minCancel0.4%Flights226
- United AirlinesOn-time81%Medianon timep9035 minCancel0.2%Flights1,206
- Southwest AirlinesOn-time72%Medianon timep9050 minCancel0.3%Flights1,434
Why flights run late
Delay causes
- Airline28%
- Weather2%
- Air traffic (NAS)11%
- Late aircraft59%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline63%
- Weather25%
- Air traffic (NAS)13%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 8 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 DEN → 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 — 87% on time.
- Mornings87% on time · p90 15 min · 2,341 flights
- Middays82% on time · p90 25 min · 2,558 flights
- Evenings68% on time · p90 65 min · 1,912 flights
- Afternoons67% on time · p90 45 min · 1,079 flights
- Overnights64% on time · p90 70 min · 1,444 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 79% on time.
- Wednesdays79% on time · p90 35 min · 1,243 flights
- Tuesdays78% on time · p90 35 min · 1,265 flights
- Mondays78% on time · p90 35 min · 1,382 flights
- Saturdays77% on time · p90 40 min · 1,234 flights
- Sundays75% on time · p90 45 min · 1,370 flights
- Fridays74% on time · p90 45 min · 1,405 flights
- Thursdays73% on time · p90 50 min · 1,435 flights
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