Historical on-time performance
Washington to Raleigh-durham
224 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–RDU arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.9%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
- United AirlinesbestOn-time83%Medianon timep9025 minCancel0.7%Flights837
- Republic AirwaysOn-time73%Medianon timep9055 minCancel1.4%Flights291
Why flights run late
Delay causes
- Airline30%
- Weather14%
- Air traffic (NAS)24%
- Late aircraft32%
- 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 → RDU
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 73% to 91% on time.
- Mornings91% on time · p90 10 min · 739 flights
- Middays89% on time · p90 10 min · 693 flights
- Evenings76% on time · p90 50 min · 768 flights
- Overnights76% on time · p90 45 min · 722 flights
- Afternoons73% on time · p90 40 min · 111 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 86% on time.
- Tuesdays86% on time · p90 20 min · 461 flights
- Wednesdays85% on time · p90 25 min · 465 flights
- Mondays83% on time · p90 25 min · 460 flights
- Saturdays82% on time · p90 30 min · 345 flights
- Thursdays82% on time · p90 25 min · 448 flights
- Fridays81% on time · p90 35 min · 473 flights
- Sundays78% on time · p90 40 min · 381 flights
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