Historical on-time performance
Denver to San Juan
2,733 miData through May 2026Source: US DOT · BTS
Flights on DEN–SJU arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 276 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time77%Medianon timep9035 minCancel0.4%Flights276
Why flights run late
Delay causes
- Airline23%
- Weather0%
- Air traffic (NAS)49%
- Late aircraft28%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline0%
- Weather0%
- Air traffic (NAS)100%
- Security0%
Most cancellations here are attributed to Air traffic (NAS). Shares are among 1 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 → SJU
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 83% on time.
- Tuesdays83% on time · p90 25 min · 119 flights · limited
- Wednesdays82% on time · p90 25 min · 119 flights · limited
- Mondays79% on time · p90 30 min · 120 flights · limited
- Fridays78% on time · p90 30 min · 120 flights · limited
- Sundays70% on time · p90 40 min · 122 flights · limited
- Thursdays69% on time · p90 35 min · 120 flights · limited
- Saturdays67% on time · p90 40 min · 135 flights · limited
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