STL - SAN

$78 Find Cheap Flights from St. Louis to San Diego

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to San Diego departing on 4/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to San Diego

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to San Diego, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to San Diego, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$239
Typical prices: $277-$512
Frontier
Sat 5/2Sat 5/9
STL - SAN • 1 stop
Cheapest non-stop
$343
Typical prices: $413-$586
Southwest
Tue 4/14Sat 4/18
STL - SAN • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Avoid peak travel times at STL for shorter waits.
Take the Route 992 bus from SAN to Downtown San Diego.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $239 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Southwest. Average duration is 4h 01m
Direct flights
Direct flights
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Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $318 (round-trip)
Shortest trip • 5h 53m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 34% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 18% price drop
Most popular
Good to know
Good to know
+1
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Good to know
Good to know
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Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Diego!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from St. Louis to San Diego (STL-SAN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to San Diego that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to San Diego

Sat, May 2 - Sat, May 9
Frontier Logo
8:17 pm - 8:34 am
STL
-
SAN
14h 17m
1 stop
Frontier Logo
6:25 am - 2:48 pm
SAN
-
STL
30h 23m
2 stops
$239Frontier
Sat, Apr 4 - Fri, Apr 10
Frontier Logo
8:16 pm - 12:02 am
STL
-
SAN
5h 46m
1 stop
Frontier Logo
9:28 pm - 9:48 am
SAN
-
STL
10h 20m
1 stop
$240Frontier
Sat, Apr 11 - Fri, Apr 17
Frontier Logo
8:16 pm - 12:02 am
STL
-
SAN
29h 46m
1 stop
Frontier Logo
11:01 am - 7:32 pm
SAN
-
STL
30h 31m
2 stops
$241Frontier
Wed, May 6 - Mon, May 11
Frontier Logo
6:51 pm - 9:12 pm
STL
-
SAN
28h 21m
1 stop
Frontier Logo
10:07 pm - 6:06 pm
SAN
-
STL
17h 59m
1 stop
$242Frontier
Mon, Apr 6 - Fri, Apr 10
Frontier Logo
12:17 pm - 2:04 pm
STL
-
SAN
27h 47m
2 stops
Frontier Logo
9:28 pm - 9:48 am
SAN
-
STL
10h 20m
1 stop
$247Frontier
Fri, Apr 10 - Sun, Apr 12
Frontier Logo
8:16 pm - 12:02 am
STL
-
SAN
29h 46m
1 stop
Frontier Logo
9:28 pm - 9:48 am
SAN
-
STL
10h 20m
1 stop
$249Frontier
Thu, Apr 16 - Thu, Apr 23
Frontier Logo
8:06 pm - 11:59 pm
STL
-
SAN
5h 53m
1 stop
Frontier Logo
6:25 am - 7:21 pm
SAN
-
STL
10h 56m
1 stop
$250Frontier
Wed, Jun 3 - Sat, Jun 6
Frontier Logo
8:08 pm - 11:50 pm
STL
-
SAN
5h 42m
1 stop
Frontier Logo
6:25 am - 2:42 pm
SAN
-
STL
6h 17m
1 stop
$252Frontier
Sun, Apr 5 - Fri, Apr 10
Frontier Logo
10:12 pm - 12:02 am
STL
-
SAN
27h 50m
2 stops
Frontier Logo
9:28 pm - 9:48 am
SAN
-
STL
10h 20m
1 stop
$254Frontier
Tue, May 5 - Mon, May 11
Frontier Logo
6:41 pm - 8:42 am
STL
-
SAN
40h 01m
2 stops
Frontier Logo
9:37 am - 7:23 pm
SAN
-
STL
7h 46m
1 stop
$259Frontier
Booking Insights

KAYAK's insights & trends for St. Louis to San Diego flights

Get data-powered insights and trends into flights from St. Louis to San Diego to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from St. Louis to San Diego?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to San Diego departing in May.

What’s the cheapest day of the week to fly from St. Louis to San Diego?

The average price of all round-trip flights from St. Louis to San Diego clicked on KAYAK for each day over the last 12 months.

For St. Louis to San Diego, Wednesday is the cheapest day to fly on average and Monday is the most expensive. Flying from San Diego back to St. Louis, the best deals are generally found on Thursday, with Tuesday being the most expensive.

What is the cheapest month to fly from St. Louis to San Diego?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to San Diego, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to San Diego is October, where tickets cost $317 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is $455 and $450 respectively.

How far in advance should I book a flight from St. Louis to San Diego?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to San Diego, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to San Diego, you should book around 4 weeks before departure, which saves you about 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Expert advice

Expert advice for your flight from St. Louis to San Diego

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Brandon Schultz

Brandon Schultz

Expert on SAN

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Good to know

Low seasonOctober
Cheapest flight$78
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from St. Louis to San Diego

When to book flights from St. Louis to San Diego

Are your dates flexible? Find out the best times to travel from St. Louis to San Diego based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to San Diego

  • How can I fly from STL to SAN?

    Southwest operates a non-stop flight from STL to SAN. Airlines such as Frontier, United Airlines, Delta, and American Airlines operate one-stop flights from STL to SAN. Some of the layover cities include Dallas (DFW), Denver (DEN), Minneapolis (MSP), Las Vegas (LAS), and Houston (IAH). American Airlines and United Airlines are among the carriers that operate flights from STL to SAN with two layovers.

  • Does STL have nursing rooms?

    Yes. STL has installed Lactation Suites in Gates A10, C9, and E33. Each unit has a comfortable club chair with a full back and a movable arm table, a sink with counter space, and power outlets.

  • Does STL have a USO?

    Yes. There are two USO lounges at STL, one in Terminal 1 at Baggage Claim M6. This lounge is open 24h. The other is in Terminal 2 near Exit 11 by Baggage Claim, open from 7 am until 6 pm. Some amenities in these lounges include showers, a sleeping area with beds, a library, a children's play area, snacks and beverages, computers, Wi-Fi, TV, comfortable seating, and more.

  • How do I get from SAN into downtown San Diego?

    From Lindbergh Field at Terminal 1 at STL, you can catch a San Diego Metro Transit bus #992 into downtown San Diego at Broadway and State Street. This trip takes about 18min and buses depart about every 20min. Taxis and shuttles can get you from STL to downtown San Diego in less than half the time but at about twice the price of a bus.

  • What is the cheapest flight from St. Louis to San Diego?

    In the last 3 days, the lowest price for a flight from St. Louis to San Diego was $78 for a one-way ticket and $239 for a round-trip.

  • Do I need a passport to fly between St. Louis and San Diego?

    A passport is not required to fly from St. Louis to San Diego.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to San Diego?

    American Airlines, Alaska Airlines, and JetBlue offer inflight Wi-Fi service on the St. Louis to San Diego flight route.

  • Which aircraft models fly most regularly from St. Louis to San Diego?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the St. Louis to San Diego flight route.

  • Which airline alliances offer flights from St. Louis to San Diego?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between St. Louis and San Diego, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from St. Louis to San Diego?

    There are nonstop flights from St. Louis to San Diego on a daily basis.

  • Which is the best airline for flights from St. Louis to San Diego, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from St. Louis to San Diego are Southwest and Delta. With an average price for the route of $458 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $305 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from St. Louis to San Diego?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to San Diego.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to San Diego?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Diego from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to San Diego?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Diego with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and SAN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to San Diego?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Diego from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from St. Louis to San Diego

  • Looking for a cheap flight? 25% of our users found flights on this route for $254 or less one-way and $432 or less round-trip.
  • The St. Louis Lambert International Airport (STL) is a hub for Cape Air and Air Choice One. San Diego International Airport (SAN) is a focus city for Southwest Airlines and Alaskan.
  • You can park your car at STL long-term before your trip to SAN at B Lot and D Lot. Free shuttles run every 10min between these lots and the terminals. There are garages and surface lots closer to the terminals, within walking distance, but these parking options are more expensive. You can check the STL homepage to see what availability there is in each of the lots.
  • At the Baggage Claim in Terminals 1 and 2 at SAN, passengers can take advantage of Traveler’s Aid if they need to. This non-profit facility is open from 8 am until 11 pm, and it provides aid to travelers who are stranded or distressed. Traveler’s Aid can assist you with issues such as transportation assistance, emergency housing, lost or stolen money, and more.
  • STL has a total of six animal relief areas for travelers who have a pet or service animal with them. The animal relief stations in the terminal can be found at Gates E4, A16, C24, and E40. The relief areas that are outside can be accessed through Exit 6 in Terminal 1 and Exit 15 in Terminal 2.
  • STL has an airport and travel-themed kids' play area, the St Louis International Playport, at Gate 2 on Concourse C. At this indoor playground, kids can play with a kid-sized plane, car, van, and truck. There is also a control tower with a sliding board, a pretend luggage conveyor belt, a pretend security area with a pretend X-ray machine, and a play-car rental counter.

Prefer to fly direct from St. Louis to San Diego?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Lambert-St Louis to San Diego.
Find which airlines fly direct from Lambert-St Louis Airport to San Diego Airport, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to San Diego

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

San Diego to Lambert-St Louis

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Reviews of the top 5 airlines serving from St. Louis to San Diego

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to San Diego. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to San Diego? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4320 reviews
8.0Comfort
7.5Entertainment
7.0Food
8.1Boarding
8.6Crew
Airline reviews

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

8.0 ExcellentTobin, Mar 2026
SJC - BUR
Read more Southwest reviews

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Snacks are always pretzels. Why can't you also offer peanuts ?

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

3 hour delay. Had to change plans and was still delayed.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

Left a few minutes early. Got in 15 minutes early. Very attentive service on board. Very organized boarding.

There’s not much to say about a one hour flight. This is a connection from LA to RNO that I missed the previous night due to a mechanical check delay on my originating flight from JFK to LAX. The short flight itself was fine. Instructions from the pilot and crew were per usual. The coffee was barely lukewarm, which possibly was purposeful so we would down it quickly. Bags were already on carousel upon reaching baggage claim, which was excellent.

Delta continues to set the benchmark for traveler-friendly service with minimal disruption and clear communication within the mainland US (coast to coast). I am consistently pleased to be a Delta customer, and this experience once again met my expectations. There was a brief delay departing from MIA due to a technical issue that required the aircraft to return to the gate. However, the situation was handled professionally and transparently. Fortunately, my planned layover allowed ample buffer time, so the adjustment caused no stress. Overall, another smooth and reassuring experience.

Awesome! On time flight, early arrival, and a complimentary upgrade!

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

I usually get upgraded so my experience is usually amazing. I did not get upgraded this time - which was fine - but the wifi had issues, the monitors were going in & out, & (though not Delta's fault) one of the gentlemen next to me desperately needed a shower.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

They are always late and seats was also not having working charger

did not have enough meal for first class passengers so offer us snack

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

No enough space plus only allowing one laggage instead of two like other airlines.

Qatar airways ,boarding arrangements at Hamid international airport could been better

Amazing I love American. I’ll never fly anyone else if I can help it.

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

My flight was originally from SAT to MCO connecting from MCO to ORD. We got diverted to ATL and than Frontier staff there was sooo un helpful first they said they couldn’t give us any accommodation since our flight first got delayed that cancelled and now it’s 221am and I am still in ATL since they said they need to create a new flight my final destination is ORD and I have been delayed twice and cancelled. With no real help the frontier app didn’t work no email updates over all such a horrible experience

There's no seats that lean back with little leg space i wad uncomfortable the entire flight. Your charges for extra baggage is despicable and costly!!

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

This is my second time flying with Frontier. My current experience was very favorable. The staff from the gate to the plane was friendly, warm and professional. The food options lacked in my opinion. This area needs some attention in my opinion.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Everything you need to know for your flight from St. Louis to San Diego

Other airlines flying from St. Louis to San Diego

Flights from the other most popular airlines that fly from St. Louis to San Diego according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.