Historical on-time performance
San Juan to New York
1,598 miData through May 2026Source: US DOT · BTS
Flights on SJU–JFK arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled2.6%of scheduled flights
based on 3,672 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time87%Medianon timep9015 minCancel2.0%Flights1,104
- Frontier AirlinesOn-time75%Medianon timep9050 minCancel1.8%Flights330
- JetBlue AirwaysOn-time73%Medianon timep9060 minCancel3.1%Flights2,238
Why flights run late
Delay causes
- Airline41%
- Weather1%
- Air traffic (NAS)13%
- Late aircraft45%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline14%
- Weather53%
- Air traffic (NAS)28%
- Security5%
Most cancellations here are attributed to Weather. Shares are among 97 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 SJU → JFK
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 20 min · 3,804 flights
- Early mornings78% on time · p90 50 min · 695 flights
- Middays78% on time · p90 40 min · 2,297 flights
- Evenings74% on time · p90 70 min · 2,174 flights
- Afternoons70% on time · p90 80 min · 1,173 flights
- Overnights62% on time · p90 85 min · 894 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 80% on time.
- Wednesdays80% on time · p90 40 min · 1,525 flights
- Thursdays79% on time · p90 45 min · 1,589 flights
- Fridays79% on time · p90 40 min · 1,603 flights
- Tuesdays78% on time · p90 45 min · 1,532 flights
- Saturdays77% on time · p90 50 min · 1,582 flights
- Mondays76% on time · p90 55 min · 1,599 flights
- Sundays75% on time · p90 55 min · 1,607 flights
Keep exploring