Cheap flights from St. Louis to San Diego from $53
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to San Diego departing on 9/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Frontier flights from St. Louis to San Diego
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Spirit Airlines flights from St. Louis to San Diego
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How to get the cheapest flight ticket from St. Louis to San Diego
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to San Diego?
If you are unable to visit San Diego during the month of January, then departing from St. Louis during the month August is also very affordable. Most momondo users find prices during this month for around $316.
What is the cheapest day to depart on your flight to San Diego?
The cheapest day to depart from St. Louis to San Diego is on a Tuesday. Travelers who choose to depart for San Diego on a Tuesday will often find tickets for as low as $479. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $601. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.
What is the cheapest time of day to depart on your flight to San Diego?
The cheapest time of day to fly to San Diego is in the afternoon when flights can be purchased for as low as $513. Flights at noon are often more expensive with an average ticket price of $571.
What is the cheapest Lambert-St Louis to San Diego flight route?
Fly from Lambert-St Louis to San Diego for the best Lambert-St Louis - San Diego flight prices
How far in advance should I book a flight to San Diego?
You are more likely to see cheaper flights to San Diego from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $353 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from St. Louis for as low as $291 on momondo.
What cabin class options are available on Lambert-St Louis to San Diego flights?
There are 1 cabin classes available to choose from on Lambert-St Louis to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Lambert-St Louis to San Diego?
Frontier, Spirit Airlines, and American Airlines are the most popular carriers operating from Lambert-St Louis to San Diego
What airlines fly to San Diego?
American Airlines, Southwest and Frontier are the top three most popular airlines that fly to San Diego from St. Louis according to our data. American Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 5 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.
How many flights depart from St. Louis to San Diego on average per day?
As of July 2025, 1 flights take off from St. Louis and land in San Diego each day. The most common flight departure time for this route is 3:00PM, with 61% of daily flights taking off in the afternoon.
How many flights depart from St. Louis to San Diego on average per week?
The number of flights available between St. Louis and San Diego is 8 per week as of July 2025. The most frequent departure day is Mon, with 25% of weekly flights leaving on this day.
When to book flights from St. Louis to San Diego
Cheap St. Louis to San Diego (STL to SAN) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Diego
How far is Lambert-St Louis to San Diego by plane?
There are 1560.0 mi between Lambert-St Louis and San Diego. By plane, this route typically takes 5h 52m.
When did momondo last update prices for flights from Lambert-St Louis Airport to San Diego Airport?
Prices for flights from Lambert-St Louis Airport to San Diego Airport are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to San Diego Airport?
The number of operators available for flights from Lambert-St Louis Airport to San Diego Airport is 5 as of July 2025.
How old do you have to be to fly from Lambert-St Louis Airport to San Diego Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Diego Airport.
What documentation or ID do you need to fly to San Diego Airport?
The travel and health documents you'll need for your trip to San Diego Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Diego Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to San Diego?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to San Diego is Boeing 737-700 Passenger/BBJ1 (winglets) (48.42% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (25.26%), Boeing 737-800 Passenger/BBJ2 (winglets) (18.95%), and Airbus A319 (3.16%).
What is the most popular airline from St. Louis to San Diego?
Based on momondo bookings for flights between St. Louis and San Diego, the leading airline is Southwest, making up 33% of the total bookings. Other popular airlines include American Airlines with 27%, Delta with 15%, and Frontier with 12%.
Best airlines flying from St. Louis to San Diego
Compare and see reviews for airlines that fly from St. Louis to San Diego with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $108 | Free Cancellation | Rating 5.9 3,284 reviews | |||
| PriceFrom $219 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 7.4 8,861 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 8.0 7,983 reviews | |||
| PriceFrom $318 | Free Cancellation | Rating 8.0 4,270 reviews |
Southwest Flights From St. Louis to San Diego
The lowest priced Southwest flight from St. Louis to San Diego from the last 72 hours was $318. Generally, Southwest has 8 flights on this route every week with an average price of $489. Southwest is rated 8.0/10 by our users.
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from St. Louis to San Diego?
Finding the right flight to San Diego from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to San Diego quick and easy, saving you time and money.
Can I find flights from St. Louis to San Diego with flexible booking policies on momondo?
Flights from St. Louis to San Diego with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from St. Louis to San Diego?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to San Diego.
I’m not ready to book a flight from St. Louis to San Diego right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to San Diego from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.