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

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

73.1% of 3,202 official scheduled IAH-to-DCA flights arrived on time; 17.5% arrived at least 30 minutes late and 1.8% 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 SIGNALGenerally reliable
73.1%arrived on time
17.5%30+ min late
1.8%cancelled
3,202scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.3%all scheduled flights
120+ minutes late3.8%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+10.6 mincompleted flights

Which departure time was most reliable for IAH to DCA?

Among qualifying IAH-to-DCA departure window results, Early morning had the highest on-time rate: 87.0% of 671 flights. Evening was lowest at 63.7% across 920 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning67187.0%6.3%2.5%
Late morning71175.7%12.9%1.8%
Afternoon90070.2%19.8%1.3%
Evening92063.7%27.1%1.7%

Which weekday was most reliable for IAH to DCA?

Among qualifying IAH-to-DCA weekday results, Tuesday had the highest on-time rate: 78.7% of 498 flights. Sunday was lowest at 69.8% across 473 flights.

DayFlightsOn time30+ minCancelled
Monday49072.2%15.9%2.7%
Tuesday49878.7%13.5%1.6%
Wednesday48273.0%18.7%0.6%
Thursday47871.8%20.1%0.6%
Friday47970.1%20.0%1.7%
Saturday30277.2%15.2%2.0%
Sunday47369.8%18.6%3.6%

Which airline was most reliable for IAH to DCA?

Among qualifying IAH-to-DCA airline results, United Airlines had the highest on-time rate: 74.2% of 2,413 flights. PSA Airlines was lowest at 65.2% across 276 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines2,41374.2%17.8%0.8%
Republic Airways51371.9%13.6%4.9%
PSA Airlines27665.2%22.1%5.1%

Which month was most reliable for IAH to DCA?

Among qualifying IAH-to-DCA month results, December 2025 had the highest on-time rate: 82.4% of 273 flights. July 2025 was lowest at 56.0% across 207 flights.

MonthFlightsOn time30+ minCancelled
July 202520756.0%31.9%2.4%
August 202520762.3%26.6%0.5%
September 202527280.5%11.8%0.0%
October 202529177.7%16.2%0.0%
November 202527073.3%16.7%3.0%
December 202527382.4%9.5%0.7%
January 202628278.4%11.7%6.7%
February 202625975.3%13.1%1.9%
March 202628969.9%19.0%3.1%
April 202628379.5%13.8%0.0%
May 202628973.4%17.0%0.7%
June 202628061.4%28.6%2.5%

What drove IAH to DCA delay minutes?

National airspace was the largest recorded IAH-to-DCA delay category, accounting for 36.3% of 57,463 BTS-attributed delay minutes during July 2025–June 2026.

Airline19.1%
Late aircraft33.5%
National airspace36.3%
Weather11.1%
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.