Historical on-time performance
Atlanta to San Juan
1,547 miData through May 2026Source: US DOT · BTS
Flights on ATL–SJU arrive on time 70% of the time over the last 12 months.
On-time rate70%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.4%of scheduled flights
based on 1,959 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time74%Medianon timep9040 minCancel1.0%Flights1,645
- Spirit AirlinesOn-time59%Median5 minp9070 minCancel4.3%Flights93
- Frontier AirlinesOn-time51%Median10 minp90100 minCancel2.7%Flights221
Why flights run late
Delay causes
- Airline47%
- Weather3%
- Air traffic (NAS)24%
- Late aircraft26%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline48%
- Weather30%
- Air traffic (NAS)0%
- Security22%
Most cancellations here are attributed to Airline. Shares are among 27 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 ATL → SJU
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 — 83% on time.
- Mornings83% on time · p90 20 min · 1,976 flights
- Middays75% on time · p90 40 min · 2,321 flights
- Afternoons66% on time · p90 65 min · 773 flights
- Evenings66% on time · p90 70 min · 1,158 flights
- Overnights40% on time · p90 135 min · 218 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 66% to 81% on time.
- Wednesdays81% on time · p90 40 min · 840 flights
- Tuesdays78% on time · p90 35 min · 818 flights
- Thursdays75% on time · p90 40 min · 950 flights
- Fridays74% on time · p90 45 min · 977 flights
- Mondays72% on time · p90 55 min · 931 flights
- Sundays69% on time · p90 55 min · 950 flights
- Saturdays66% on time · p90 60 min · 980 flights
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