Historical on-time performance
San Juan to Washington
1,571 miData through May 2026Source: US DOT · BTS
Flights on SJU–IAD arrive on time 87% of the time over the last 12 months.
On-time rate87%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 575 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time87%Medianon timep9020 minCancel0.7%Flights575
Why flights run late
Delay causes
- Airline27%
- Weather0%
- Air traffic (NAS)20%
- Late aircraft53%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather50%
- Air traffic (NAS)50%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 4 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 → IAD
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 — 94% on time.
- Mornings94% on time · p90 5 min · 694 flights
- Evenings81% on time · p90 35 min · 378 flights
- Afternoons75% on time · p90 40 min · 525 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 88% on time.
- Tuesdays88% on time · p90 15 min · 207 flights
- Fridays87% on time · p90 20 min · 207 flights
- Wednesdays86% on time · p90 15 min · 191 flights · limited
- Mondays86% on time · p90 15 min · 235 flights
- Sundays84% on time · p90 25 min · 294 flights
- Thursdays83% on time · p90 30 min · 221 flights
- Saturdays78% on time · p90 30 min · 244 flights
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