STL - SAN

$65 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 4/25. 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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Everything you should know

Cheapest round-trip
$245
Overall average: $398
Frontier
Sun 3/1Thu 3/5
STL - SAN • 1 stop
Cheapest non-stop
$351
Typical prices: $420-$591
Southwest
Wed 5/13Wed 5/27
STL - SAN • Non-stop
Our travelers' advice
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
Video guide: How to find cheap flights to San Diego
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Top airlines
Frontier
Cheapest • from $245 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 36% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 18% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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

Sun, Mar 1 - Thu, Mar 5
Frontier Logo
10:11 pm - 1:05 pm
STL
-
SAN
16h 54m
1 stop
Frontier Logo
11:59 am - 9:49 am
SAN
-
STL
19h 50m
1 stop
$245Frontier
Fri, Apr 3 - Sun, Apr 12
Frontier Logo
8:16 pm - 12:02 am
STL
-
SAN
29h 46m
1 stop
Frontier Logo
9:56 pm - 11:19 pm
SAN
-
STL
47h 23m
2 stops
$246Frontier
Sun, Mar 1 - Fri, Mar 6
Frontier Logo
10:11 pm - 10:45 am
STL
-
SAN
14h 34m
2 stops
Frontier Logo
9:18 pm - 9:49 am
SAN
-
STL
10h 31m
1 stop
$247Frontier
Mon, Apr 13 - Wed, Apr 15
Frontier Logo
12:22 pm - 1:52 pm
STL
-
SAN
27h 30m
1 stop
Frontier Logo
10:00 am - 10:30 am
SAN
-
STL
22h 30m
2 stops
$249Frontier
Wed, Feb 25 - Sat, Mar 7
Frontier Logo
4:51 pm - 9:41 pm
STL
-
SAN
6h 50m
1 stop
Frontier Logo
3:16 pm - 9:02 pm
SAN
-
STL
27h 46m
1 stop
$251Frontier
Wed, Feb 25 - Sat, Mar 7
Frontier Logo
4:51 pm - 9:41 pm
STL
-
SAN
6h 50m
1 stop
Frontier Logo
6:25 am - 5:57 am
SAN
-
STL
21h 32m
2 stops
$252Frontier
Thu, Mar 5 - Mon, Mar 9
United Airlines Logo
2:50 pm - 9:03 pm
STL
-
SAN
8h 13m
1 stop
United Airlines Logo
6:30 am - 4:49 pm
SAN
-
STL
8h 19m
1 stop
$253United Airlines
Sat, Mar 21 - Sun, Mar 29
Frontier Logo
8:12 pm - 12:08 am
STL
-
SAN
29h 56m
1 stop
Frontier Logo
9:59 pm - 11:19 pm
SAN
-
STL
47h 20m
2 stops
$254Frontier
Thu, Mar 26 - Sat, Apr 4
Frontier Logo
8:06 pm - 4:13 pm
STL
-
SAN
22h 07m
1 stop
Frontier Logo
2:51 pm - 9:17 pm
SAN
-
STL
28h 26m
1 stop
$255Frontier
Fri, Mar 6 - Thu, Mar 12
Frontier Logo
8:12 pm - 2:30 pm
STL
-
SAN
20h 18m
2 stops
Frontier Logo
9:18 pm - 9:49 am
SAN
-
STL
10h 31m
1 stop
$256Frontier
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.

Find cheap flights to San Diego
Find cheap flights to San Diego

Planning a trip from St. Louis to San Diego? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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 Monday 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 December and January, where the average cost of round-trip tickets is $450 and $438 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 36% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 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 seasonJanuary
Cheapest flight$65
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly with an average 10% increase in price.
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 $65 for a one-way ticket and $245 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 $462 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 $291 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 $179 or less one-way and $394 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 4286 reviews
8.6Crew
7.5Entertainment
8.0Comfort
7.0Food
8.1Boarding
Airline reviews

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

2.0 MediocreDarcey, Feb 2026
SAN - SJC
Read more Southwest reviews

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.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

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 was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

The crew took good care of us. The flight from ATL to SFO is a longer one, and there were multiple beverage offerings. I like the 757's that Delta uses. Good airplane that is comfortable. I do wish Delta would separate Priority boarding from the better seats. I would gladly take a smaller seat in an open row than be jammed into Comfort just to get priority boarding, just to make sure I don't have to check a bag.

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

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

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.

After the door had been closed, the cockpit makes an announcement that catering is running late and it is not the airline's fault. It is their fault in the sense that we had to sit for 2 hours or more when we could have stayed in the terminal. Poor communications between catering and airline. This caused a young man to lose his temper and he went storming out hitting objects. He had complained to the gate agent that he had already waited at the gate 7 hours and when can the airplane leave? Airilnes do a poor job of explaining delays, maintenance issues, etc. whereas being truthful may gain more sympathy or understanding.

We were told the flight was delayed 5 times, then it was moved to the next day.

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.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

It didn’t happen. I booked it and then was told it wasn’t available and then forced to pay far higher prices for a worse option

A 630departure flight Delayed 6hours! They changed my gate, I moved to the new gate. Had our flight on the screen for 12noon departure. I go get above to eat, check screen again and the flight was gone, no notice no announcement, nothing!! They sent my bag on the flight I wasn’t on, got it back to me 3days later. Thank goodness they did refund my money but I will NEVER fly them again.

Due to weather, my flight was delayed, further delayed, then canceled. I eventually got through to a support person who helped me find a different route out of MSP, but to get to DIA, they didn't want to, but eventually did help with the connection ticket purchase. But even this replacement flight was delayed time and time again, and I would have missed my connecting flights and I didn't want to get stuck in a layover city, so after 12 hours at the airport with two young boys who were very tired, we just cancelled our plans and spent the week at home, instead of Nana's.

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.