Historical on-time performance
Boston to St. Thomas
1,693 miData through May 2026Source: US DOT · BTS
Flights on BOS–STT arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay95 min1 in 10 flights is worse (tail risk)
Cancelled5.4%of scheduled flights
based on 129 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.
- JetBlue AirwaysOn-time70%Medianon timep9050 minCancel4.5%Flights67
- Delta Air LinesOn-time66%Medianon timep90110 minCancel6.5%Flights62
Why flights run late
Delay causes
- Airline44%
- Weather0%
- Air traffic (NAS)46%
- Late aircraft10%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline29%
- Weather29%
- Air traffic (NAS)29%
- Security14%
Most cancellations here are attributed to Airline. Shares are among 7 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
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