$592 Cheap Flights from Houston (IAH) to Castries (SLU)

View $592 flight on Sun, Jan 18, 2026Opens in a new window

Popular airlines from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU)

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Cheap Flights from Houston to Castries (IAH-SLU)

Prices were available within the past 7 days and start at $592 for one-way flights and $1,409 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, May 3 - Thu, May 7
IAH
Houston
SLU
Castries
$1,409 Roundtrip, found 2 days ago
$1,409
Roundtrip
found 2 days ago
Select United flight, departing Sun, May 3 from Houston to Castries, returning Thu, May 7, priced at $1,409 found 2 days ago

Find the cheapest month to fly from Houston (IAH) to Castries (SLU)

August is typically the cheapest month to fly

From $472 - $816 per traveler.

Alternative airports near Castries

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Hewanorra Intl. UVF. Cheapest option available. Average driving time to city center is 53 minutes. Flights from $691
UVF
Hewanorra Intl.
Cheapest
Average driving time to city center53 min
Flights from $691
Flights from Houston (IAH) to Castries (SLU)
Origin airport
George Bush Intercontinental
Destination airport
George F. L. Charles
Roundtrip price
$1,408
Distance
2447 mi

Houston to Castries Flights

The cheapest times to fly from Houston to Castries

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Houston to Castries are during the month of May. You can find some of the cheapest flights from Houston to Castries with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Houston to Castries

Sunday is one of the best days to book for cheap flights from Houston to Castries: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Houston to Castries

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Houston to Castries in 2025. You can also book with separate airlines for your outbound and return journeys, from $592 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Houston to Castries flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Houston to Castries airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU) cost?
Get a cheap one-way flight from $592 or cheap return flight from $1,409 from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU)?
Planning your getaway for May may help you find better deals, as it's the cheapest month for flights between IAH and SLU. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest IAH to SLU flight.
How many flights per day from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU)?
There are no daily nonstop flights from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from IAH to SLU?
Usually you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU)?
To touch down at George F. L. Charles Airport (SLU) on schedule, book a flight that leaves from George Bush Intercontinental Airport (IAH) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU) last-minute?
Booking your flight from IAH to SLU right before your trip is typically more expensive. But if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book an IAH to SLU flight and hotel package?
Booking an IAH to SLU flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Select from our extensive range of stays and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from George Bush Intercontinental Airport (IAH) to George F. L. Charles Airport (SLU)?
You can usually reschedule or cancel your IAH to SLU flight. However, if it's been more than 24 hours since booking, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.