$647 Cheap Flights from Castries (SLU) to San Diego (SAN)

View $647 flight on Tue, Mar 10, 2026Opens in a new window

Popular airlines from George F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN)

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Cheap Flights from Castries to San Diego (SLU-SAN)

Prices were available within the past 7 days and start at $647 for one-way flights and $1,193 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Windward Island Airways International
Tue, Mar 10 - Mon, Mar 16
SLU
Castries
SAN
San Diego
$1,193 Roundtrip, found 18 hours ago
$1,193
Roundtrip
found 18 hours ago
Select Windward Island Airways International flight, departing Tue, Mar 10 from Castries to San Diego, returning Mon, Mar 16, priced at $1,193 found 18 hours ago

Alternative airports near San Diego

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

Select flight to McClellan-Palomar CLD. Average driving time to city center is 38 minutes. Flights from $712
CLD
McClellan-Palomar
Average driving time to city center38 min
Flights from $712
Flights from Castries (SLU) to San Diego (SAN)
Origin airport
George F. L. Charles
Destination airport
San Diego Intl.
Roundtrip price
$1,193
Distance
3744 mi

Castries to San Diego Flights

The cheapest times to fly from Castries to San Diego

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 Castries to San Diego are during the month of March. You can find some of the cheapest flights from Castries to San Diego with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Castries to San Diego

Sunday is one of the best days to book for cheap flights from Castries to San Diego: 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 Castries to San Diego

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 Castries to San Diego in 2025. You can also book with separate airlines for your outbound and return journeys, from $647 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 Castries to San Diego 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 Castries to San Diego 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 F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN) cost?
Secure a cheap one-way flight from $647 or cheap return flight from $1,193 from George F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN) 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 F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN)?
The cheapest month to fly from SLU to SAN is March, when there's less demand. Off-peak season is generally when better flight deals are available between these airports.
What is the cheapest airline that flies from George F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest SLU to SAN flight.
How many flights per day from George F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN)?
Direct flights from George F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SLU to SAN?
Usually you'll find the largest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can vary depending on the time of year, 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 F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN)?
Choose a flight from George F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN) that leaves before 3 PM to reduce the risk of delays and cancellations. Later departures are on average 22% more likely to be canceled.**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 F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN) last-minute?
Booking your flight from SLU to SAN shortly before your journey is generally more expensive. However, if there's some wiggle room with your departure dates and times, you could grab a cheap last-minute fare.
Is it cheaper to book a SLU to SAN flight and hotel package?
Compared with arranging flights and hotels separately, booking a SLU to SAN flight and hotel package with Expedia could lead to significant savings. What's more, having it all in one place takes the hassle out of travel planning. Simply pick your flights and choose from our extensive range of hotels, then customize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from George F. L. Charles Airport (SLU) to San Diego Intl. Airport (SAN)?
If you reserved your SLU to SAN flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

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*Available to One Key members.