Historical on-time performance
New York to St. Thomas
1,623 miData through Dec 2025Source: US DOT · BTS
Flights on JFK–STT arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 462 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Delta Air LinesOn-time84%Medianon timep9025 minCancel0.0%Flights216
- American AirlinesOn-time87%Medianon timep9025 minCancel0.8%Flights246
Why flights run late
Delay causes
- Airline58%
- Weather7%
- Air traffic (NAS)25%
- Late aircraft9%
- Security0%
Most delay minutes here are attributed to Airline.
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 (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 82% to 82% on time.
- Mornings82% on time · p90 30 min · 1,397 flights
- Middays82% on time · p90 30 min · 218 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 86% on time.
- Thursdays86% on time · p90 25 min · 224 flights
- Fridays85% on time · p90 20 min · 224 flights
- Tuesdays83% on time · p90 35 min · 227 flights
- Sundays83% on time · p90 30 min · 229 flights
- Wednesdays81% on time · p90 25 min · 225 flights
- Mondays80% on time · p90 30 min · 227 flights
- Saturdays78% on time · p90 35 min · 259 flights
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