$159 Cheap United flights Houston (IAH) to San Diego (SAN)

View $159 flight on Wed, Nov 19, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$159 Cheap United flights Houston (IAH) to San Diego (SAN)

Prices were available within the past 7 days and start at $159 for one-way flights and $317 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Sep 16 - Tue, Sep 30
IAH
Houston
SAN
San Diego
$317 Roundtrip, found 3 hours ago
$317
Roundtrip
found 3 hours ago
Select United flight, departing Tue, Sep 16 from Houston to San Diego, returning Tue, Sep 30, priced at $317 found 3 hours ago
Flights from Houston (IAH) to San Diego (SAN)
Origin airport
George Bush Intercontinental
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Spirit Airlines, United
Popular airline
Alaska Airlines
Distance
1300 mi
Average flight time
2 hours 14 mins

Frequently asked questions

How much is a United Airlines flight from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN)?
Grab affordable return United Airlines flights from $317 from IAH to SAN by sorting your results from "Price (lowest to highest)" on Expedia. Or search for options from $159 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from IAH to SAN with United Airlines?
United Airlines flights to San Diego are typically cheaper in the off-peak months of January and November. Whether you need a round-trip or one-way ticket, you could score a better deal then.
What is the cheapest time to book flights from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN) with United Airlines?
Look for affordable United Airlines flights from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN) one to three months prior to your departure date. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and journey, the best day to book a domestic flight is usually Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN)?
United Airlines offers direct flights from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN), with 28 departures each week. Simply apply the "Nonstop" and "Airline" filters while searching on Expedia to see all direct United Airlines flights to SAN.
How long does it take to fly from IAH to SAN with United Airlines?
Depart George Bush Intercontinental Airport (IAH) for San Diego Intl. Airport (SAN) on a direct United Airlines flight, and you'll be in the sky for around 3h 39m.
Which day of the week has the most United Airlines flights from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN)?
United Airlines operates the most flights from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN) on Thursday. With up to 4 daily departures, you'll get the most flexibility and choice on this day.
What is the earliest United Airlines flight from IAH to SAN?
The earliest United Airlines flight from IAH to SAN departs at 9:30AM UTC-6, arriving at 11:07AM UTC-8. If you'd like to set off later in the day, the last United Airlines flight leaves IAH at 8:20PM UTC-6 and touches down at SAN at 10:00PM UTC-8. Flying before noon is generally a smart choice as morning and mid-morning flights are least likely to experience cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in San Diego?
United Airlines flights from George Bush Intercontinental Airport (IAH) to San Diego land at San Diego Intl. Airport (SAN). This is the main entry point to this destination.
Why fly with United Airlines from IAH to SAN?
With a rewarding loyalty program, United Airlines is a top pick for many passengers departing from IAH to SAN. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights on top of your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN)?
For the George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN) route, United Airlines typically uses Boeing 737-900 and Boeing 737 MAX 8 planes. Remember that last-minute changes can occur for operational needs, so your flight could be on a different aircraft.
Can I change or cancel my United Airlines flight from George Bush Intercontinental Airport (IAH) to San Diego Intl. Airport (SAN)?
It's usually possible to cancel or reschedule your flight, although there may be a charge if you booked more than 24 hours ago. Need flexible options? Apply the "Changes included" and "No cancel fee" filters to find flights that won't charge extra if you have to revise your plans. To make changes, go to "Trips," select your flight and click on "Manage Booking" for further information.

Explore a world of travel with Expedia

*Available to One Key members.