BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
IADRDU

Washington, DC (IAD) to Raleigh/Durham, NC (RDU) flight delay odds

Historically, 83.1% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,293 flights.

HISTORICAL ROUTE SIGNALLower disruption
83.1%arrived on time
9.0%30+ min late
1.2%cancelled
1,293scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.0%all scheduled flights
120+ minutes late2.6%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+4.7 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Early morning32290.7%3.4%0.0%
Afternoon31785.2%7.6%1.6%
Evening31777.0%14.8%0.9%
Night33779.8%10.1%2.4%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday18480.4%13.0%1.1%
Tuesday19088.9%5.8%0.5%
Wednesday19284.9%8.9%1.0%
Thursday19279.2%9.4%1.6%
Friday19383.9%11.4%0.0%
Saturday15085.3%6.0%2.7%
Sunday19279.7%7.8%2.1%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,08084.0%8.1%1.1%
Republic Airways21378.9%13.6%1.9%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 20257979.7%10.1%5.1%
August 202510786.0%8.4%0.9%
September 202514087.1%5.7%0.7%
October 202511984.9%7.6%0.0%
November 202511882.2%5.1%0.8%
December 202512076.7%12.5%0.0%
January 20269383.9%8.6%6.5%
February 20269184.6%7.7%1.1%
March 202611575.7%18.3%0.9%
April 202611387.6%7.1%0.0%
May 202611290.2%6.2%0.0%
June 20268676.7%11.6%1.2%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline39.2%
Late aircraft33.4%
National airspace13.4%
Weather14.0%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.