Historical on-time performance
Washington to Miami
921 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–MIA arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.2%of scheduled flights
based on 455 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time84%Medianon timep9025 minCancel0.2%Flights455
Why flights run late
Delay causes
- Airline17%
- Weather3%
- Air traffic (NAS)39%
- Late aircraft41%
- 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 IAD → MIA
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 — 86% on time.
- Mornings86% on time · p90 20 min · 1,083 flights
- Afternoons75% on time · p90 50 min · 64 flights · limited
- Evenings67% on time · p90 75 min · 352 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 86% on time.
- Tuesdays86% on time · p90 20 min · 199 flights · limited
- Wednesdays82% on time · p90 25 min · 199 flights · limited
- Mondays81% on time · p90 25 min · 236 flights
- Thursdays81% on time · p90 35 min · 228 flights
- Fridays80% on time · p90 35 min · 231 flights
- Saturdays79% on time · p90 40 min · 226 flights
- Sundays77% on time · p90 50 min · 234 flights
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