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

Washington, DC (DCA) to Houston, TX (IAH) flight delay odds

Historically, 79.5% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,200 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
79.5%arrived on time
13.1%30+ min late
2.0%cancelled
3,200scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.8%all scheduled flights
120+ minutes late3.7%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+1.3 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 morning95188.4%5.6%2.4%
Late morning36885.9%9.2%0.8%
Afternoon1,30074.3%17.9%1.0%
Evening58172.5%16.9%4.1%

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
Monday49078.0%14.5%2.9%
Tuesday49684.1%10.3%1.4%
Wednesday48580.2%12.6%1.6%
Thursday47880.5%13.6%0.6%
Friday47875.5%15.7%1.3%
Saturday30183.7%8.6%2.0%
Sunday47275.8%14.6%4.0%

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 Airlines2,41382.8%11.8%0.9%
Republic Airways51171.8%14.3%5.1%
PSA Airlines27664.5%21.7%5.4%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202520772.5%20.3%2.4%
August 202520781.6%13.5%1.0%
September 202527286.0%9.6%0.0%
October 202529187.6%6.2%0.0%
November 202527078.9%11.9%3.0%
December 202527479.9%14.6%0.7%
January 202628278.7%8.9%6.4%
February 202625887.6%7.0%2.3%
March 202628979.6%13.5%3.8%
April 202628283.3%12.8%0.0%
May 202628870.1%20.1%1.0%
June 202628067.5%20.0%2.9%

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.

Airline24.2%
Late aircraft43.2%
National airspace27.0%
Weather5.5%
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.