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

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

84.3% of 3,600 official scheduled SFO-to-IAH flights arrived on time; 8.3% arrived at least 30 minutes late and 0.3% 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 SIGNALLower disruption
84.3%arrived on time
8.3%30+ min late
0.3%cancelled
3,600scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.8%all scheduled flights
120+ minutes late1.5%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+0.2 mincompleted flights

Which departure time was most reliable for SFO to IAH?

Among qualifying SFO-to-IAH departure window results, Early morning had the highest on-time rate: 94.4% of 787 flights. Late morning was lowest at 75.3% across 669 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning78794.4%2.4%0.4%
Late morning66975.3%11.4%0.4%
Afternoon1,07481.0%10.3%0.1%
Evening34186.2%9.1%0.0%
Night72985.5%8.4%0.4%

Which weekday was most reliable for SFO to IAH?

Among qualifying SFO-to-IAH weekday results, Tuesday had the highest on-time rate: 86.1% of 511 flights. Monday was lowest at 81.9% across 520 flights.

DayFlightsOn time30+ minCancelled
Monday52081.9%11.2%0.2%
Tuesday51186.1%6.7%0.2%
Wednesday51985.4%8.9%0.2%
Thursday51983.4%9.4%0.4%
Friday50983.7%7.5%0.2%
Saturday50384.5%6.4%0.2%
Sunday51985.0%7.9%0.6%

Which airline was most reliable for SFO to IAH?

Only United Airlines met the SFO-to-IAH airline threshold: 84.3% of 3,600 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
United Airlines3,60084.3%8.3%0.3%

Which month was most reliable for SFO to IAH?

Among qualifying SFO-to-IAH month results, September 2025 had the highest on-time rate: 92.4% of 289 flights. May 2026 was lowest at 78.5% across 307 flights.

MonthFlightsOn time30+ minCancelled
July 202529980.6%12.0%0.0%
August 202529978.6%11.0%0.3%
September 202528992.4%3.5%0.0%
October 202530689.5%5.2%0.3%
November 202529980.3%10.4%0.7%
December 202531183.9%8.4%0.0%
January 202630384.8%7.9%1.0%
February 202627787.0%7.2%0.0%
March 202631086.5%8.1%1.0%
April 202630088.0%5.7%0.0%
May 202630778.5%9.8%0.0%
June 202630081.7%10.0%0.0%

What drove SFO to IAH delay minutes?

Airline was the largest recorded SFO-to-IAH delay category, accounting for 38.8% of 28,722 BTS-attributed delay minutes during July 2025–June 2026.

Airline38.8%
Late aircraft31.1%
National airspace29.2%
Weather1.0%
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.