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

Houston, TX (IAH) to San Francisco, CA (SFO) flight delay odds

78.2% of 3,600 official scheduled IAH-to-SFO flights arrived on time; 13.9% arrived at least 30 minutes late and 0.5% 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
78.2%arrived on time
13.9%30+ min late
0.5%cancelled
3,600scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.5%all scheduled flights
120+ minutes late3.0%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+4.4 mincompleted flights

Which departure time was most reliable for IAH to SFO?

Among qualifying IAH-to-SFO departure window results, Early morning had the highest on-time rate: 90.2% of 824 flights. Evening was lowest at 65.2% across 854 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning82490.2%4.7%0.4%
Late morning36674.0%15.3%1.4%
Afternoon1,19379.3%14.5%0.1%
Evening85465.2%23.4%0.5%
Night36382.1%9.1%1.1%

Which weekday was most reliable for IAH to SFO?

Among qualifying IAH-to-SFO weekday results, Tuesday had the highest on-time rate: 86.4% of 514 flights. Monday was lowest at 72.3% across 516 flights.

DayFlightsOn time30+ minCancelled
Monday51672.3%16.9%0.2%
Tuesday51486.4%8.4%0.4%
Wednesday52078.3%14.2%0.6%
Thursday51874.3%16.6%0.4%
Friday50977.2%14.5%0.2%
Saturday50481.9%10.9%0.8%
Sunday51977.1%15.8%0.8%

Which airline was most reliable for IAH to SFO?

Only United Airlines met the IAH-to-SFO airline threshold: 78.2% of 3,600 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
United Airlines3,60078.2%13.9%0.5%

Which month was most reliable for IAH to SFO?

Among qualifying IAH-to-SFO month results, September 2025 had the highest on-time rate: 89.3% of 289 flights. June 2026 was lowest at 57.0% across 300 flights.

MonthFlightsOn time30+ minCancelled
July 202529973.9%18.1%0.0%
August 202529979.9%11.4%0.7%
September 202528989.3%3.8%0.0%
October 202530681.7%10.1%0.7%
November 202529981.6%15.1%0.0%
December 202531179.4%13.5%0.3%
January 202630383.5%11.2%1.3%
February 202627785.2%9.4%0.4%
March 202631087.1%7.7%1.6%
April 202630074.0%18.3%0.3%
May 202630766.4%22.5%0.0%
June 202630057.0%25.3%0.3%

What drove IAH to SFO delay minutes?

National airspace was the largest recorded IAH-to-SFO delay category, accounting for 41.5% of 50,352 BTS-attributed delay minutes during July 2025–June 2026.

Airline26.0%
Late aircraft27.7%
National airspace41.5%
Weather4.8%
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.