Historical on-time performance
Washington to Raleigh-durham
Flights on IAD–RDU arrive on time 82% of the time over the last 12 months.
based on 1,256 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- United AirlinesOn-time84%Medianon timep9020 minCancel1.0%Flights1,064
- Republic AirwaysOn-time72%Medianon timep9085 minCancel2.1%Flights192
Why flights run late
Delay causes
- Airline33%
- Weather15%
- Air traffic (NAS)16%
- Late aircraft36%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline27%
- Weather53%
- Air traffic (NAS)20%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 15 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 IAD → RDU
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 — 92% on time.
- Mornings92% on time · p90 10 min · 762 flights
- Middays87% on time · p90 15 min · 691 flights
- Evenings77% on time · p90 55 min · 820 flights
- Overnights77% on time · p90 40 min · 806 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 79% to 86% on time.
- Tuesdays86% on time · p90 15 min · 476 flights
- Wednesdays84% on time · p90 25 min · 481 flights
- Saturdays83% on time · p90 25 min · 370 flights
- Thursdays82% on time · p90 25 min · 473 flights
- Fridays82% on time · p90 35 min · 491 flights
- Mondays81% on time · p90 30 min · 473 flights
- Sundays79% on time · p90 35 min · 426 flights
Keep exploring