Historical on-time performance
San Juan to Detroit
1,929 miData through Dec 2025Source: US DOT · BTS
Flights on SJU–DTW arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.4%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-time82%Medianon timep9040 minCancel0.4%Flights274
Why flights run late
Delay causes
- Airline35%
- Weather2%
- Air traffic (NAS)20%
- Late aircraft43%
- 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 SJU → DTW
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Middays are the most reliable time of day to fly this route — 90% on time.
- Middays90% on time · p90 10 min · 148 flights · limited
- Afternoons80% on time · p90 35 min · 915 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 87% on time.
- Tuesdays87% on time · p90 15 min · 138 flights · limited
- Wednesdays85% on time · p90 15 min · 146 flights · limited
- Mondays83% on time · p90 35 min · 172 flights · limited
- Saturdays81% on time · p90 35 min · 215 flights
- Thursdays81% on time · p90 45 min · 150 flights · limited
- Sundays81% on time · p90 40 min · 154 flights · limited
- Fridays75% on time · p90 45 min · 169 flights · limited
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