IAH to SAN flight delays
Houston, TX (IAH) San Diego, CA (SAN) · 1,303 miles
142 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
71.13%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
64 min
When late, late by
Average across delayed arrivals
20 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The two directions do not behave alike. SAN to IAH arrives on time 8.5 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Only United Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
Flights from Houston to San Diego run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over March 2025 – August 2026, United Airlines arrived on time most often on IAH to SAN.
Every airline on IAH to SAN
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| United Airlines | 142 | 71.13% | 0% | 64 min | C |
The return leg
SAN to IAH San Diego back to Houston 79.58% on time BOther routes from Houston
Common questions
Are flights from Houston to San Diego usually delayed?
71.13% of flights on the IAH to SAN route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Houston to San Diego?
Only United Airlines appears in the published record on this route, with 142 flights and 71.13% arriving on time.
How often are IAH to SAN flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When IAH to SAN flights are late, how late are they?
About 64 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on IAH to SAN during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →