Historical on-time performance
San Juan to Washington
1,571 miData through Dec 2025Source: US DOT · BTS
Flights on SJU–IAD arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 525 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time85%Medianon timep9025 minCancel0.4%Flights525
Why flights run late
Delay causes
- Airline16%
- Weather0%
- Air traffic (NAS)32%
- Late aircraft52%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SJU → IAD
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 — 94% on time.
- Mornings94% on time · p90 5 min · 637 flights
- Evenings79% on time · p90 40 min · 361 flights
- Afternoons75% on time · p90 40 min · 445 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 87% on time.
- Mondays87% on time · p90 15 min · 210 flights
- Fridays87% on time · p90 20 min · 178 flights · limited
- Tuesdays86% on time · p90 20 min · 188 flights · limited
- Sundays84% on time · p90 25 min · 280 flights
- Wednesdays83% on time · p90 25 min · 173 flights · limited
- Thursdays83% on time · p90 30 min · 197 flights · limited
- Saturdays79% on time · p90 35 min · 218 flights
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