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

Seattle, WA (SEA) to Houston, TX (IAH) flight delay odds

79.5% of 2,095 official scheduled SEA-to-IAH flights arrived on time; 11.9% arrived at least 30 minutes late and 0.6% 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
79.5%arrived on time
11.9%30+ min late
0.6%cancelled
2,095scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.3%all scheduled flights
120+ minutes late1.3%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+1.9 mincompleted flights

Which departure time was most reliable for SEA to IAH?

Among qualifying SEA-to-IAH departure window results, Early morning had the highest on-time rate: 88.2% of 449 flights. Late morning was lowest at 67.9% across 467 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning44988.2%5.6%0.7%
Late morning46767.9%19.3%0.6%
Afternoon28581.8%11.2%0.0%
Evening39882.7%9.8%0.8%
Night49678.8%12.7%0.8%

Which weekday was most reliable for SEA to IAH?

Among qualifying SEA-to-IAH weekday results, Wednesday had the highest on-time rate: 83.9% of 292 flights. Friday was lowest at 73.5% across 310 flights.

DayFlightsOn time30+ minCancelled
Monday30079.3%11.7%0.7%
Tuesday28382.7%8.8%0.4%
Wednesday29283.9%9.9%0.7%
Thursday30978.6%14.9%0.3%
Friday31073.5%13.5%0.6%
Saturday30179.7%13.0%0.3%
Sunday30079.3%11.0%1.3%

Which airline was most reliable for SEA to IAH?

Among qualifying SEA-to-IAH airline results, United Airlines had the highest on-time rate: 83.6% of 1,243 flights. Alaska Airlines was lowest at 73.6% across 852 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,24383.6%9.7%0.6%
Alaska Airlines85273.6%15.0%0.7%

Which month was most reliable for SEA to IAH?

Among qualifying SEA-to-IAH month results, February 2026 had the highest on-time rate: 93.8% of 112 flights. July 2025 was lowest at 61.4% across 236 flights.

MonthFlightsOn time30+ minCancelled
July 202523661.4%22.0%2.1%
August 202522867.5%16.7%1.3%
September 202519889.4%6.1%0.0%
October 202517681.8%12.5%0.6%
November 202514881.8%11.5%0.0%
December 202516875.0%16.1%0.0%
January 202613483.6%8.2%0.7%
February 202611293.8%5.4%0.0%
March 202614479.2%12.5%2.1%
April 202615086.7%6.0%0.0%
May 202618484.2%8.7%0.0%
June 202621784.3%9.7%0.0%

What drove SEA to IAH delay minutes?

Airline was the largest recorded SEA-to-IAH delay category, accounting for 43.0% of 23,027 BTS-attributed delay minutes during July 2025–June 2026.

Airline43.0%
Late aircraft30.3%
National airspace25.3%
Weather1.0%
Security0.3%
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.