Flight deals from St. Louis to San Diego

We've found these cheap flights for you. You can book one-way or return flight tickets.

Round-trip
One way

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Find the best time to fly from St. Louis to San Diego

We monitor flight fares to help you find the best deals effortlessly

Cheapest flights

From price

11 18
18 25
Jun

25 1
1 8
8 15
15 22
22 29
Jul

29 6
6 13
13 20
20 27
Aug

27 3

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

FAQ

When are flight tickets from St. Louis (STL) to San Diego (SAN) the cheapest?

Airlines adjust prices for flights from St. Louis to San Diego based on the date and time of your booking. By analyzing data from all airlines, on Trip.com, you can find the cheapest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much are flights from St. Louis (STL) to San Diego (SAN) cost?

According to Trip.com's data, the lowest price is around AU$654.
How long is the flight from St. Louis (STL) to San Diego (SAN)?

It takes about 5 hours 18 minutes to fly from St. Louis (STL) to San Diego (SAN).
What are the most popular airlines that fly from St. Louis (STL) to San Diego (SAN)?

Airlines with flights from St. Louis (STL) to San Diego (SAN): Southwest Airlines and United Airlines.
How many airports in San Diego (SAN)?

There are 3 airport(s) in San Diego (SAN): McClellan-Palomar Airport, Miramar Naval Air Station and San Diego International Airport.

How to find a cheap flight from St. Louis to San Diego

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to San Diego. Book your flights at the right time and save more.

Be flexible with your travel dates to get the cheapest flight from St. Louis to San Diego.

Simply tap "Date" on the flight search bar to browse through the calendar and check out airfare from St. Louis to San Diego over the next 6 months in 2025. If you're planning to fly within the next three months, it looks like the most affordable option is on Sun, May 25, with one-way flights priced at just AU$320.

Compare cheap flight deals from St. Louis to San Diego across hundreds of airlines.

With our extensive search, you can compare prices from over 500 airlines to find the cheapest flight tickets from St. Louis to San Diego. The cheapest airline for this route is Southwest Airlines.

Set up a Price Alert

By setting up a Price Alert for your journey from St. Louis to San Diego, you can easily keep an eye on ticket prices without having to check every day.

Don't miss out on cheap flight deals and promo codes from St. Louis to San Diego.

You can always find the latest offers through Trip.com Deals and Promo Codes for cheap flights. By signing up for a free membership, you'll get access to even more deals for your flights.

Book early or wait until the last minute.

It's usually best to book early. Flight tickets are often cheapest when they're first released, typically about a year before the departure date. So, have a look online as soon as the flights you're interested in become available. If you miss the cheapest time, you might still find some good deals as the departure date gets closer.

Search for flights on the go.

For the best travel flight booking experience, download the Trip.com app. You can search for cheap flights from St. Louis to San Diego and snag some exclusive deals just for you.

Flight Information from St. Louis to San Diego

Cheapest one-way flight price	AU$148
Cheapest return ticket price	AU$431
Off-season travel month	April
Peak season for travel	June
Flight distance	2,514.9km
Average flight time	5 hours 18 minutes
Popular airline	Alaska Airlines