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

Atlanta, GA (ATL) to Houston, TX (IAH) flight delay odds

74.9% of 4,914 official scheduled ATL-to-IAH flights arrived on time; 15.2% arrived at least 30 minutes late and 1.9% 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
74.9%arrived on time
15.2%30+ min late
1.9%cancelled
4,914scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.6%all scheduled flights
120+ minutes late3.3%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+8.1 mincompleted flights

Which departure time was most reliable for ATL to IAH?

Among qualifying ATL-to-IAH departure window results, Late morning had the highest on-time rate: 81.7% of 1,011 flights. Night was lowest at 66.4% across 752 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning85981.6%7.8%2.0%
Late morning1,01181.7%10.1%2.6%
Afternoon1,42173.3%16.1%1.0%
Evening87170.5%21.5%1.5%
Night75266.4%21.5%2.9%

Which weekday was most reliable for ATL to IAH?

Among qualifying ATL-to-IAH weekday results, Wednesday had the highest on-time rate: 80.0% of 680 flights. Sunday was lowest at 69.9% across 714 flights.

DayFlightsOn time30+ minCancelled
Monday74871.5%18.2%2.0%
Tuesday67378.5%12.8%1.2%
Wednesday68080.0%11.6%0.7%
Thursday74376.4%14.9%0.8%
Friday74174.5%14.6%1.9%
Saturday61574.0%15.4%2.9%
Sunday71469.9%18.5%3.6%

Which airline was most reliable for ATL to IAH?

Among qualifying ATL-to-IAH airline results, United Airlines had the highest on-time rate: 84.1% of 1,255 flights. Spirit Airlines was lowest at 63.0% across 384 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines2,50874.3%14.7%2.0%
United Airlines1,25584.1%9.9%1.1%
Frontier Airlines76767.9%21.6%1.4%
Spirit Airlines38463.0%22.9%4.7%

Which month was most reliable for ATL to IAH?

Among qualifying ATL-to-IAH month results, September 2025 had the highest on-time rate: 85.9% of 384 flights. July 2025 was lowest at 63.3% across 414 flights.

MonthFlightsOn time30+ minCancelled
July 202541463.3%25.4%2.2%
August 202538072.1%18.7%1.1%
September 202538485.9%8.1%0.3%
October 202543978.4%13.2%0.5%
November 202540280.1%13.7%2.0%
December 202536970.7%14.4%3.0%
January 202639474.6%13.5%4.3%
February 202638485.7%9.4%0.3%
March 202643970.2%16.6%6.4%
April 202646980.0%12.4%0.4%
May 202644468.5%19.1%0.5%
June 202639670.2%17.4%1.8%

What drove ATL to IAH delay minutes?

Airline was the largest recorded ATL-to-IAH delay category, accounting for 38.6% of 75,693 BTS-attributed delay minutes during July 2025–June 2026.

Airline38.6%
Late aircraft33.9%
National airspace24.9%
Weather2.6%
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.