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

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

Historically, 84.3% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,600 flights.

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

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

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%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

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%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

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

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

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 reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

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.