Historical on-time performance
San Juan to St. Thomas
68 miData through May 2026Source: US DOT · BTS
Flights on SJU–STT arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled0.7%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-time74%Medianon timep9060 minCancel0.7%Flights277
Why flights run late
Delay causes
- Airline33%
- Weather5%
- Air traffic (NAS)10%
- Late aircraft52%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather50%
- Air traffic (NAS)50%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 2 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 SJU → STT
All airlines · rolling 36 months (2023-06 .. 2026-05).
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 · 736 flights
- Afternoons65% on time · p90 75 min · 712 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 80% on time.
- Tuesdays80% on time · p90 40 min · 200 flights
- Sundays74% on time · p90 45 min · 221 flights
- Thursdays72% on time · p90 65 min · 219 flights
- Wednesdays72% on time · p90 60 min · 189 flights · limited
- Fridays69% on time · p90 60 min · 212 flights
- Mondays69% on time · p90 70 min · 208 flights
- Saturdays67% on time · p90 80 min · 212 flights
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