Historical on-time performance
Detroit to San Juan
1,929 miData through Dec 2025Source: US DOT · BTS
Flights on DTW–SJU arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights
based on 274 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesOn-time74%Medianon timep9035 minCancel0.0%Flights274
Why flights run late
Delay causes
- Airline45%
- Weather0%
- Air traffic (NAS)52%
- Late aircraft3%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly DTW → SJU
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 — 81% on time.
- Mornings81% on time · p90 25 min · 1,018 flights
- Middays65% on time · p90 55 min · 121 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 86% on time.
- Tuesdays86% on time · p90 20 min · 138 flights · limited
- Sundays84% on time · p90 30 min · 154 flights · limited
- Wednesdays83% on time · p90 20 min · 146 flights · limited
- Saturdays80% on time · p90 20 min · 215 flights
- Fridays78% on time · p90 45 min · 169 flights · limited
- Mondays75% on time · p90 35 min · 172 flights · limited
- Thursdays72% on time · p90 35 min · 149 flights · limited
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