BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
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IAD→IAH

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

83.1% of 1,869 official scheduled IAD-to-IAH flights arrived on time; 10.3% arrived at least 30 minutes late and 0.5% 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
83.1%arrived on time
10.3%30+ min late
0.5%cancelled
1,869scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.6%all scheduled flights
120+ minutes late2.5%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival-0.1 mincompleted flights

Which departure time was most reliable for IAD to IAH?

Among qualifying IAD-to-IAH departure window results, Early morning had the highest on-time rate: 89.7% of 712 flights. Evening was lowest at 70.6% across 367 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning71289.7%5.1%0.4%
Late morning6889.7%8.8%0.0%
Afternoon43782.2%11.7%0.5%
Evening36770.6%19.6%0.3%
Night28582.8%9.5%1.1%

Which weekday was most reliable for IAD to IAH?

Among qualifying IAD-to-IAH weekday results, Tuesday had the highest on-time rate: 87.3% of 267 flights. Sunday was lowest at 81.3% across 268 flights.

DayFlightsOn time30+ minCancelled
Monday27083.3%9.3%0.7%
Tuesday26787.3%6.7%0.0%
Wednesday26182.8%11.5%0.8%
Thursday26683.8%10.9%0.0%
Friday27081.5%12.6%0.0%
Saturday26782.0%11.2%0.0%
Sunday26881.3%9.7%1.9%

Which airline was most reliable for IAD to IAH?

Only United Airlines met the IAD-to-IAH airline threshold: 83.1% of 1,869 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
United Airlines1,86983.1%10.3%0.5%

Which month was most reliable for IAD to IAH?

Among qualifying IAD-to-IAH month results, February 2026 had the highest on-time rate: 93.8% of 112 flights. July 2025 was lowest at 71.6% across 155 flights.

MonthFlightsOn time30+ minCancelled
July 202515571.6%23.9%0.6%
August 202517479.3%9.8%0.0%
September 202519592.3%2.6%0.0%
October 202518082.2%11.1%0.0%
November 202514886.5%8.8%0.0%
December 202513977.7%10.1%0.0%
January 202612986.0%7.8%3.9%
February 202611293.8%4.5%0.0%
March 202614483.3%11.8%1.4%
April 202614688.4%6.2%0.0%
May 202616782.6%11.4%0.6%
June 202618076.7%14.4%0.0%

What drove IAD to IAH delay minutes?

National airspace was the largest recorded IAD-to-IAH delay category, accounting for 34.6% of 20,739 BTS-attributed delay minutes during July 2025–June 2026.

Airline28.8%
Late aircraft30.2%
National airspace34.6%
Weather6.4%
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.