Historical on-time performance
Denver to San Francisco
Flights on DEN–SFO arrive on time 68% of the time over the last 12 months.
based on 5,391 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.
- United AirlinesOn-time73%Medianon timep9055 minCancel0.4%Flights3,367
- Frontier AirlinesOn-time70%Medianon timep9055 minCancel0.9%Flights565
- Southwest AirlinesOn-time55%Median10 minp9075 minCancel0.6%Flights1,459
Why flights run late
Delay causes
- Airline22%
- Weather2%
- Air traffic (NAS)39%
- Late aircraft38%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline55%
- Weather28%
- Air traffic (NAS)17%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 29 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 → SFO
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 — 78% on time.
- Mornings78% on time · p90 35 min · 4,424 flights
- Middays73% on time · p90 50 min · 3,888 flights
- Afternoons67% on time · p90 60 min · 1,904 flights
- Evenings60% on time · p90 95 min · 3,058 flights
- Overnights59% on time · p90 80 min · 3,291 flights
Best day of week
Tuesdays are the most reliable day to fly this route — 75% on time.
- Tuesdays75% on time · p90 45 min · 2,292 flights
- Saturdays72% on time · p90 50 min · 2,171 flights
- Wednesdays71% on time · p90 55 min · 2,319 flights
- Mondays67% on time · p90 65 min · 2,474 flights
- Fridays67% on time · p90 70 min · 2,505 flights
- Sundays65% on time · p90 70 min · 2,333 flights
- Thursdays64% on time · p90 80 min · 2,472 flights
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