Historical on-time performance
San Juan to St. Thomas
68 miData through Dec 2025Source: US DOT · BTS
Flights on SJU–STT arrive on time 78% of the time over the last 12 months.
On-time rate78%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 277 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- JetBlue AirwaysOn-time78%Medianon timep9045 minCancel0.4%Flights277
Why flights run late
Delay causes
- Airline38%
- Weather3%
- Air traffic (NAS)11%
- Late aircraft46%
- Security1%
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 → STT
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 — 78% on time.
- Middays78% on time · p90 45 min · 804 flights
- Afternoons65% on time · p90 70 min · 690 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 79% on time.
- Tuesdays79% on time · p90 40 min · 208 flights
- Sundays74% on time · p90 50 min · 228 flights
- Wednesdays73% on time · p90 70 min · 197 flights · limited
- Thursdays72% on time · p90 65 min · 224 flights
- Mondays71% on time · p90 60 min · 216 flights
- Saturdays70% on time · p90 60 min · 217 flights
- Fridays69% on time · p90 60 min · 217 flights
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