Historical on-time performance
Miami to Washington
921 miData through May 2026Source: US DOT · BTS
Flights on MIA–IAD arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 512 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time81%Medianon timep9045 minCancel0.4%Flights512
Why flights run late
Delay causes
- Airline12%
- Weather10%
- Air traffic (NAS)27%
- Late aircraft51%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline50%
- Weather50%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 2 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 MIA → 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 — 86% on time.
- Mornings86% on time · p90 15 min · 334 flights
- Middays81% on time · p90 40 min · 1,175 flights
- Evenings74% on time · p90 50 min · 165 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 88% on time.
- Wednesdays88% on time · p90 30 min · 218 flights
- Tuesdays86% on time · p90 15 min · 214 flights
- Mondays82% on time · p90 30 min · 259 flights
- Thursdays80% on time · p90 35 min · 254 flights
- Fridays79% on time · p90 50 min · 260 flights
- Saturdays78% on time · p90 50 min · 244 flights
- Sundays72% on time · p90 55 min · 264 flights
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