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

Houston, TX (IAH) to San Diego, CA (SAN) flight delay odds

Historically, 80.8% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,693 flights.

HISTORICAL ROUTE SIGNALLower disruption
80.8%arrived on time
11.8%30+ min late
0.4%cancelled
1,693scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.0%all scheduled flights
120+ minutes late2.4%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+1.5 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
Late morning36586.0%9.0%0.3%
Afternoon71383.2%10.8%0.1%
Evening61575.0%14.5%0.8%

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
Monday25579.6%12.5%0.8%
Tuesday22486.6%9.4%0.0%
Wednesday24686.6%6.9%0.8%
Thursday25275.0%13.9%0.0%
Friday24378.2%16.5%0.4%
Saturday21982.6%11.4%0.5%
Sunday25478.0%11.4%0.4%

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 Airlines1,69380.8%11.8%0.4%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202514166.7%22.0%2.1%
August 202514174.5%16.3%0.7%
September 202513788.3%6.6%0.7%
October 202514784.4%8.2%0.0%
November 202514279.6%10.6%0.0%
December 202514582.1%12.4%0.0%
January 202612882.8%11.7%0.0%
February 202612791.3%4.7%0.0%
March 202615285.5%9.2%1.3%
April 202614281.7%7.0%0.0%
May 202614982.6%12.1%0.0%
June 202614271.1%19.7%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.

Airline30.0%
Late aircraft37.9%
National airspace22.4%
Weather9.7%
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.