Historical on-time performance
Raleigh-durham to Washington
224 miData through Dec 2025Source: US DOT · BTS
Flights on RDU–IAD arrive on time 86% of the time over the last 12 months.
On-time rate86%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 1,128 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.
- United AirlinesOn-time87%Medianon timep9015 minCancel1.2%Flights837
- Republic AirwaysOn-time83%Medianon timep9030 minCancel1.4%Flights291
Why flights run late
Delay causes
- Airline12%
- Weather17%
- Air traffic (NAS)29%
- Late aircraft43%
- 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 RDU → IAD
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 72% to 92% on time.
- Middays92% on time · p90 5 min · 860 flights
- Overnights92% on time · p90 on time · 101 flights · limited
- Mornings90% on time · p90 10 min · 776 flights
- Evenings84% on time · p90 35 min · 596 flights
- Afternoons72% on time · p90 30 min · 694 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 90% on time.
- Saturdays90% on time · p90 10 min · 342 flights
- Thursdays87% on time · p90 15 min · 458 flights
- Wednesdays87% on time · p90 15 min · 455 flights
- Tuesdays86% on time · p90 20 min · 459 flights
- Mondays85% on time · p90 20 min · 454 flights
- Sundays83% on time · p90 25 min · 392 flights
- Fridays82% on time · p90 30 min · 467 flights
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