Historical on-time performance
Philadelphia to St. Thomas
1,605 miData through Dec 2025Source: US DOT · BTS
Flights on PHL–STT arrive on time 87% of the time over the last 12 months.
On-time rate87%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.0%of scheduled flights
based on 62 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- American AirlinesOn-time87%Medianon timep9025 minCancel0.0%Flights62
Why flights run late
Delay causes
- Airline20%
- Weather0%
- Air traffic (NAS)60%
- Late aircraft20%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly PHL → 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 77% to 83% on time.
- Middays83% on time · p90 30 min · 254 flights
- Mornings77% on time · p90 40 min · 184 flights · limited
Best day of week
Fridays are the most reliable day to fly this route — 88% on time.
- Fridays88% on time · p90 15 min · 52 flights · limited
- Saturdays77% on time · p90 40 min · 146 flights · limited
- Tuesdays75% on time · p90 45 min · 51 flights · limited
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