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

Chicago, IL (ORD) to Houston, TX (IAH) flight delay odds

73.8% of 6,077 official scheduled ORD-to-IAH flights arrived on time; 17.2% arrived at least 30 minutes late and 1.4% 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 SIGNALGenerally reliable
73.8%arrived on time
17.2%30+ min late
1.4%cancelled
6,077scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.8%all scheduled flights
120+ minutes late4.1%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+8.5 mincompleted flights

Which departure time was most reliable for ORD to IAH?

Among qualifying ORD-to-IAH departure window results, Early morning had the highest on-time rate: 85.6% of 1,480 flights. Evening was lowest at 63.6% across 1,374 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,48085.6%8.6%0.9%
Late morning83679.7%13.0%0.7%
Afternoon1,90071.8%19.2%0.8%
Evening1,37463.6%23.6%2.5%
Night48763.9%24.4%3.9%

Which weekday was most reliable for ORD to IAH?

Among qualifying ORD-to-IAH weekday results, Tuesday had the highest on-time rate: 79.1% of 837 flights. Friday was lowest at 69.4% across 903 flights.

DayFlightsOn time30+ minCancelled
Monday88673.4%19.5%1.8%
Tuesday83779.1%13.0%1.1%
Wednesday82277.0%16.3%0.5%
Thursday89675.9%15.1%1.8%
Friday90369.4%19.2%1.3%
Saturday81872.5%16.4%1.8%
Sunday91569.6%20.3%1.6%

Which airline was most reliable for ORD to IAH?

Among qualifying ORD-to-IAH airline results, United Airlines had the highest on-time rate: 78.0% of 4,000 flights. American Airlines was lowest at 58.5% across 798 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines4,00078.0%13.8%0.7%
American Airlines79858.5%28.7%3.0%
Republic Airways35974.4%17.5%2.5%
Envoy Air35872.9%17.9%1.4%
Spirit Airlines30759.6%28.3%5.5%
Frontier Airlines24973.9%19.3%2.4%
PSA Airlines450.0%50.0%0.0%
SkyWest Airlines20.0%50.0%0.0%

Which month was most reliable for ORD to IAH?

Among qualifying ORD-to-IAH month results, February 2026 had the highest on-time rate: 85.7% of 433 flights. July 2025 was lowest at 62.0% across 516 flights.

MonthFlightsOn time30+ minCancelled
July 202551662.0%26.6%2.1%
August 202553170.6%20.2%2.1%
September 202553284.0%10.0%0.2%
October 202551878.4%12.4%0.2%
November 202546775.2%15.8%3.0%
December 202551273.0%18.2%0.6%
January 202646877.8%15.0%1.7%
February 202643385.7%8.5%0.2%
March 202651269.5%19.3%3.1%
April 202652668.6%18.6%2.7%
May 202653774.1%18.2%0.0%
June 202652568.4%21.7%1.3%

What drove ORD to IAH delay minutes?

Late aircraft was the largest recorded ORD-to-IAH delay category, accounting for 41.7% of 110,287 BTS-attributed delay minutes during July 2025–June 2026.

Airline26.0%
Late aircraft41.7%
National airspace25.2%
Weather7.1%
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.