Historical on-time performance
St. Thomas to Philadelphia
1,605 miData through May 2026Source: US DOT · BTS
Flights on STT–PHL arrive on time 64% of the time over the last 12 months.
On-time rate64%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled2.3%of scheduled flights
based on 128 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesOn-time64%Medianon timep9055 minCancel2.3%Flights128
Why flights run late
Delay causes
- Airline19%
- Weather1%
- Air traffic (NAS)5%
- Late aircraft75%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather67%
- Air traffic (NAS)33%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 3 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 STT → PHL
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 71% to 79% on time.
- Middays79% on time · p90 20 min · 117 flights · limited
- Afternoons71% on time · p90 55 min · 342 flights
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