OnTimeStats

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 Airlinesbest
    On-time83%
    Medianon time
    p9025 min
    Cancel0.7%
    Flights837
  • Republic Airways
    On-time73%
    Medianon time
    p9055 min
    Cancel1.4%
    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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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.