Historical on-time performance
New York to St. Thomas
1,623 miData through May 2026Source: US DOT · BTS
Flights on JFK–STT arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled2.3%of scheduled flights
based on 432 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- Delta Air LinesOn-time85%Medianon timep9020 minCancel2.2%Flights186
- American AirlinesOn-time80%Medianon timep9045 minCancel2.4%Flights246
Why flights run late
Delay causes
- Airline67%
- Weather5%
- Air traffic (NAS)22%
- Late aircraft6%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather80%
- Air traffic (NAS)10%
- Security10%
Most cancellations here are attributed to Weather. Shares are among 10 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 JFK → STT
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 75% to 86% on time.
- Thursdays86% on time · p90 25 min · 226 flights
- Fridays85% on time · p90 20 min · 226 flights
- Sundays83% on time · p90 30 min · 229 flights
- Tuesdays82% on time · p90 35 min · 225 flights
- Wednesdays81% on time · p90 30 min · 223 flights
- Mondays77% on time · p90 45 min · 225 flights
- Saturdays75% on time · p90 35 min · 263 flights
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