Historical on-time performance
Baltimore to San Juan
1,565 miData through Dec 2025Source: US DOT · BTS
Flights on BWI–SJU arrive on time 71% of the time over the last 12 months.
On-time rate71%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.3%of scheduled flights
based on 1,029 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Spirit AirlinesOn-time75%Medianon timep9050 minCancel1.0%Flights205
- Southwest AirlinesOn-time70%Medianon timep9050 minCancel0.1%Flights824
Why flights run late
Delay causes
- Airline29%
- Weather6%
- Air traffic (NAS)36%
- Late aircraft29%
- Security1%
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 BWI → SJU
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 75% on time.
- Mornings75% on time · p90 35 min · 1,207 flights
- Middays68% on time · p90 60 min · 466 flights
- Afternoons68% on time · p90 65 min · 305 flights
- Evenings61% on time · p90 65 min · 1,181 flights
- Overnights60% on time · p90 95 min · 897 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 61% to 73% on time.
- Wednesdays73% on time · p90 50 min · 552 flights
- Tuesdays72% on time · p90 45 min · 505 flights
- Thursdays67% on time · p90 55 min · 538 flights
- Fridays66% on time · p90 70 min · 587 flights
- Sundays63% on time · p90 65 min · 621 flights
- Mondays62% on time · p90 75 min · 589 flights
- Saturdays61% on time · p90 60 min · 664 flights
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