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

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

80.0% of 1,867 official scheduled IAH-to-IAD flights arrived on time; 12.3% arrived at least 30 minutes late and 0.4% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
80.0%arrived on time
12.3%30+ min late
0.4%cancelled
1,867scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.1%all scheduled flights
120+ minutes late2.4%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+5.2 mincompleted flights

Which departure time was most reliable for IAH to IAD?

Among qualifying IAH-to-IAD departure window results, Early morning had the highest on-time rate: 90.9% of 364 flights. Evening was lowest at 74.4% across 648 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning36490.9%3.3%0.8%
Afternoon82079.3%12.7%0.2%
Evening64874.4%17.0%0.5%

Which weekday was most reliable for IAH to IAD?

Among qualifying IAH-to-IAD weekday results, Monday had the highest on-time rate: 83.8% of 266 flights. Friday was lowest at 76.4% across 271 flights.

DayFlightsOn time30+ minCancelled
Monday26683.8%9.8%0.8%
Tuesday26183.1%11.5%0.0%
Wednesday26277.5%14.9%0.0%
Thursday27081.5%8.9%0.7%
Friday27176.4%15.5%0.0%
Saturday26978.8%13.4%0.4%
Sunday26879.1%12.3%1.1%

Which airline was most reliable for IAH to IAD?

Only United Airlines met the IAH-to-IAD airline threshold: 80.0% of 1,867 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
United Airlines1,86780.0%12.3%0.4%

Which month was most reliable for IAH to IAD?

Among qualifying IAH-to-IAD month results, September 2025 had the highest on-time rate: 92.7% of 193 flights. July 2025 was lowest at 57.4% across 155 flights.

MonthFlightsOn time30+ minCancelled
July 202515557.4%29.7%0.6%
August 202517473.6%18.4%0.0%
September 202519392.7%5.2%0.0%
October 202518085.0%10.6%0.0%
November 202514881.1%8.1%0.0%
December 202514085.7%9.3%0.0%
January 202612986.0%7.0%3.1%
February 202611180.2%6.3%0.0%
March 202614571.0%17.2%1.4%
April 202614689.0%6.8%0.0%
May 202616685.5%8.4%0.6%
June 202618072.2%18.3%0.0%

What drove IAH to IAD delay minutes?

Airline was the largest recorded IAH-to-IAD delay category, accounting for 33.7% of 21,342 BTS-attributed delay minutes during July 2025–June 2026.

Airline33.7%
Late aircraft32.6%
National airspace22.4%
Weather11.3%
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.