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

St. Louis, MO (STL) to Houston, TX (IAH) flight delay odds

79.7% of 428 official scheduled STL-to-IAH flights arrived on time; 11.4% arrived at least 30 minutes late and 1.2% 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
79.7%arrived on time
11.4%30+ min late
1.2%cancelled
428scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.3%all scheduled flights
120+ minutes late3.5%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+3.2 mincompleted flights

Which departure time was most reliable for STL to IAH?

Only Early morning met the STL-to-IAH departure window threshold: 82.5% of 354 scheduled flights arrived on time during July 2025–June 2026.

Departure windowFlightsOn time30+ minCancelled
Early morning35482.5%8.8%1.1%

Which weekday was most reliable for STL to IAH?

Among qualifying STL-to-IAH weekday results, Tuesday had the highest on-time rate: 87.7% of 57 flights. Sunday was lowest at 71.2% across 59 flights.

DayFlightsOn time30+ minCancelled
Monday7582.7%17.3%0.0%
Tuesday5787.7%7.0%1.8%
Wednesday5381.1%9.4%0.0%
Thursday6283.9%6.5%1.6%
Friday6777.6%13.4%0.0%
Saturday5572.7%14.5%3.6%
Sunday5971.2%10.2%1.7%

Which airline was most reliable for STL to IAH?

Among qualifying STL-to-IAH airline results, United Airlines had the highest on-time rate: 82.2% of 360 flights. SkyWest Airlines was lowest at 66.2% across 68 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines36082.2%9.2%1.4%
SkyWest Airlines6866.2%23.5%0.0%

Which month was most reliable for STL to IAH?

Among qualifying STL-to-IAH month results, September 2025 had the highest on-time rate: 94.1% of 51 flights. July 2025 was lowest at 64.5% across 31 flights.

MonthFlightsOn time30+ minCancelled
July 20253164.5%29.0%0.0%
August 20253781.1%13.5%2.7%
September 20255194.1%3.9%0.0%
October 20255082.0%8.0%0.0%
November 20254981.6%6.1%2.0%
December 20253473.5%14.7%0.0%
January 20263568.6%20.0%5.7%
February 20262986.2%6.9%0.0%
March 20263180.6%3.2%3.2%
April 20263090.0%3.3%0.0%
May 20263167.7%19.4%0.0%
June 20262075.0%20.0%0.0%

What drove STL to IAH delay minutes?

Airline was the largest recorded STL-to-IAH delay category, accounting for 60.2% of 6,981 BTS-attributed delay minutes during July 2025–June 2026.

Airline60.2%
Late aircraft22.4%
National airspace13.7%
Weather3.7%
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.