STL - SAN

$55 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 4/2. 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.
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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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Cheap Flight Deals 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.

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

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from St. Louis to San Diego.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
4:07 pm - 9:38 amSTL-SAN
19h 31m1 stop
10:38 am - 3:07 pmSAN-STL
26h 29m1 stop
$118Frontier
Find Deal
Thu, May 8 - Wed, May 14
7:03 pm - 12:20 amSTL-SAN
7h 17m1 stop
7:39 pm - 9:06 amSAN-STL
11h 27m1 stop
$130Frontier
Find Deal
Wed, Mar 12 - Thu, Apr 17
6:00 am - 12:28 pmSTL-SAN
8h 28m1 stop
2:27 pm - 10:47 pmSAN-STL
6h 20m1 stop
$159American Airlines
Find Deal
Tue, May 13 - Sat, May 17
11:39 am - 6:11 pmSTL-SAN
8h 32m1 stop
6:30 am - 4:41 pmSAN-STL
8h 11m1 stop
$217American Airlines
Find Deal
Tue, Mar 11 - Sat, Mar 15
5:37 pm - 10:42 pmSTL-SAN
7h 05m1 stop
10:00 pm - 9:28 amSAN-STL
9h 28m1 stop
$277Delta
Find Deal
Fri, Apr 4 - Mon, Apr 7
5:00 am - 9:38 amSTL-SAN
6h 38m1 stop
8:00 am - 6:00 pmSAN-STL
8h 00m1 stop
$278United Airlines
Find Deal
Mon, May 26 - Fri, May 30
1:39 pm - 7:53 pmSTL-SAN
8h 14m2 stops
7:43 am - 5:50 pmSAN-STL
8h 07m1 stop
$282United Airlines
Find Deal
Wed, Mar 5 - Sat, Mar 8
6:00 am - 1:05 pmSTL-SAN
9h 05m1 stop
10:00 pm - 9:36 amSAN-STL
9h 36m1 stop
$307Delta
Find Deal
Thu, Mar 13 - Mon, Mar 17
6:00 am - 8:10 amSTL-SAN
4h 10mnonstop
7:00 am - 12:30 pmSAN-STL
3h 30mnonstop
$317Southwest
Find Deal
Thu, Mar 13 - Mon, Mar 17
6:00 am - 8:10 amSTL-SAN
4h 10mnonstop
6:40 am - 2:00 pmSAN-STL
5h 20m1 stop
$323Southwest
Find Deal
Thu, Mar 6 - Tue, Mar 11

Flights from St. Louis to San Diego - Travel Insights & Trends

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, Friday is the cheapest day to fly on average and Saturday is the most expensive. Flying from San Diego back to St. Louis, the best deals are generally found on Wednesday, with Sunday 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 April, where tickets cost $236 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $385 and $371 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 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Good to know

Low season

May

High season

June

Cheapest flight

$55
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 13% 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 $55 for a one-way ticket and $118 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, and Alaska Airlines 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 737-700 Passenger/BBJ1 (winglets) is the aircraft model that flies most regularly on the St. Louis to San Diego flight 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 $493 and an overall rating of 8.1, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $300 and an overall rating of 8.0.

  • 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.

See more FAQs

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 $259 or less one-way and $428 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.
See more tips

Prefer to fly direct from 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
See more direct flights

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.
8.1
SouthwestOverall score based on 4411 reviews
7.6Entertainment
8.2Boarding
7.1Food
8.1Comfort
8.7Crew
Airline reviews

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

10.0 ExcellentAnonymous, Dec 2024AUS - OAK
Read more Southwest reviews

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

Exceptional crew! Friendly and professional. Pleasant attitude and treated everyone with respect.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

The plane arrived 25 minutes late, and the Wi-Fi was slower than it usually is.

Forget beverage, they didn't even have water for half the passangers?

Can not wait for seating change to reduce the amount of pre boards - it’s disheartening the abuse. And then then deplaning

The crew was nice. Boarding sucked. Instead of loading from the back to the front people just sat wherever and you had to wait for them to move to get to a seat. And the flight was 25 minutes delayed.

I boarded last because of my boarding assignment and was given a middle seat at the back of the plane. I’m 6”1” so it was really tight. I wish I just had a seat assignment instead of a general boarding group. My bag was way at the front and my seat at the back. Was never offered a beverage and had no room to move.

If I pay extra for "comfort+" I expect leg room where I can stretch my legs. I was seated with an attendant's seat blocking my feet. Knee space was fine but my feet had less room than the non-"comfort+" seats. Also, don't go cheap on food when you have flights of 3+ hours. It's insulting.

Only one side of the heafphone jack work. Crew was friendly and helpful.

Great. Flight departed early and arrived early. Deplaning and baggage claim ww were quick.

They separated our seats and moved us to the back of the plane. Hundreds of dollars and thousands of miles used and this was my platinum member experience.

AC barely worked on a 50 minute flight. It was very warm the whole flight. Flight was very bumpy and hard landing.

Got on the plane and then needed to deboard the plane because they didn’t have any pilots?

The flight was canceled two hours before departure, it took over five hours to rebook us on another flight.

Rough day of travel all the way around. Wrong info given to us multiple times and mistakes in their booking making our trip 10 hours longer than planned. I’m bummed because I fly Delta all the time and love them. Mistakes happen. Just bummed that this was a rare trip our whole family was traveling together.

Meh. A late flight meant I missed my connections, and a 2pm LAX arrival turned into gettin in after midnight.

It was good until there was a 3 hour delay because there was not any pilots to fly the plane.

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

For the most part united was a good experience, how ever when they came by with the snacks and water, they completely passed by my wife and I. As we were in separate rows. On a 5 hr flight we were not offered water

Fantastic crew. Flight was delayed at last minute but we were given updates every 20 minutes and the crew was so friendly and considerate. I miss the touch screens on the back of the seats, wish they would bring that back though.

Awful. Worst airline I have ever been on. Crew were among the rudest people I have ever dealt with. United staff members were rude and disrespectful. My flight was delayed, causing me to miss a connecting flight. I understand things happen, but when staff start lying about what actually happened, that is when I have an issue. Just be honest, really it isn’t that hard. I’m being very honest with this review and I don’t find this difficult what so ever. In fact, because of United Airlines, my Christmas holiday was off to a really rocky start. As someone who has traveled across the world, it has only been United that I have had a truly awful experience.

Boarding always seems a bit chaotic. Seat spacing could leave more for leg room.

Good flight. On time. Boarding and seating was easy. Crew were really friendly, yet professional. Bathroom (by cockpit) was small but serviceable. Some the seats were showing some notable wear & tear, but were comfy. Very happy UA customer. TY! 🤛🏽💗

We arrived early and finally made it to our gate almost an hour after.

We were delayed 3x and because I didn’t purchase my tickets directly from United Airlines I was told I Have to take care of it myself so I called Underpricer and they helped me but before I changed my flights I took the risk of sticking by what my tickets were and was lucky to have gotten on the original all flight with only 15 mins before take off. not sure if I will do this again

Everything good until we waited for jet bridge at SFO. Then pilot gets on speaker & said it won’t reach plane- too short, need to go to different gate. Then 5 min later, adjusted plane/jetbridge & all ok?!?

Was a pain having to leave the plane and reboard but glad the plane was fixed

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

This flight didn’t happen because AA agents didn’t let us board the flight

Miami lounges were overcrowded and we were unable to get in. We only had a short time. But the banks are too tight in all American hubs

Plane was pretty clean, staff was friendly and helpful, flight left about on time arrived early. Took a long time to board and get off the plane - carry on items didn't have enough room so people had to move all around to find places.

The service and food needs to improve to catch up with other international flights

Would have been good to have a meal since it was a 5.5 hour flight

We boarded after several delays due to mechanical failure and a gate change. The seat cushion in the exit row was very compressed and offered no cushion, making the four-hour journey reasonably uncomfortable. The WiFi worked for a few people, but for most, it did not, and you cannot get entertainment unless you can connect—American Airlines flights do not have seatback screens, and you must use your mobile phone.

AA is always pretty solid. Was on time all the way around today so can’t complain!

My boarding pass wouldn't pull up in the app very easily and had to really dig through my email. That caused a delay in TSA..

Overall boarding and debarking is a joke. I dont even bring luggage anymore on trips because you can never allow them to be place then in the overhead bin or you have to pay or you check them which is even worse having to wait for your luggage on the tarmac.

The check in process was a mess for no reason. I spent an hour waiting in line trying to get them to print my boarding pass and as a result I missed my flight.

The airline used deceptive tactics to charge us more for our trip. Search Frontier Class Action Lawsuit to find out more or read the hundreds of reviews that have nearly identical stories.. don't fly this airline.. you've been warned.

Check in at Philadelphia international was absolutely terrible! I fly 2 to 3 times a month and avoid frontier at all cost and will never fly Frontier again! The night before travel, I tried checking in however, the app was giving me an error, so I went to the desktop, which instructed you that you need to use the app. The next day I presented at the check-in gate after trying at least a half dozen times prior to getting into the airport and continuing to getting the error in the app. I actually had rebooted my phone numerous times and reinstall the app just in case. My phone is only one generation older than the current model. It has no problems completing a frontier flight purchase or any other app issues. There was only three frontier employees working at check-in and a huge line while I was in line I continued to try and check in via the app. As I approach the desk, I was dreading dealing with the agent. He was extremely unprofessional, anti-semantic & very ignorant, and mean to the people in front of me, as well as the people who ended up being behind me. He literally told people “Man I don’t care bout y’all” in his native dialect! Maintaining my composure I approached and explained the situation. To which he replied, you’re gonna have to pay then! I don’t understand. It’s an issue with their app not allowing me to check in! Not my issue! He told me if I pay cash it would be $15, $25 if I pay credit card. I don’t understand a $10 difference for paying with a credit card? I am completely cashless so I continued to try using the app to avoid the $25 fee, Which I still don’t believe that I should be responsible for since it was Frontier’s technical issue!!! I continued to check in via the app a couple more times after he verified I was doing everything right he proceeded to continue to belittle the people behind me. Yelling at them saying I don’t care about you people! I cannot believe that this is the way that businesses would treat its customers! Unfortunately, the black mail with dreadlocks did not have a name tag all he had was a frontier sweater on! For the $25 fee that I ended up getting charged on my credit card. I should’ve just booked originally with Spirit or any other carrier! I have no problem paying fees that I should be responsible for, but when it’s due to a technical failure of a company, the customer should not be responsible for it! I cannot believe that it’s not frontier going out of business!

they delayed my flight which ended up, causing my layover flight to leave without me, resulting in me missing a flight and having to stay overnight in Houston international. I got no compensation other than a flight to my original location only a day later. i’ve never experienced such a unprofessional situation

Very easy with the app to board and staff skills

After waiting several minutes to be acknowledged by 3 employees on their phones, was told we had missed our flight because the doors were closed at that literal moment. Had they given any actual service or help while we were standing there we would have been on with time to spare. More than 10 people were turned away in this fashion claiming there was no way they could let us on the plane, even though it was still sitting connected to the terminal. After the desk agents let us know they didn't care about the situation we were forced to pay more than twice the price of our original tickets as no credits were given for the price of the "missed" flight. And the icing on the cake was after being treated poorly, fleeced for another few hundred dollars for new tickets? We waited on the next plane for 25 minutes passed the "doors closed" time, letting almost an extra dozen passengers on board. You're company has lazy, disinterested employees and your lack of any real help will ensure this was the first and last time we fly Frontier. Awful.

My experience with the phoenix airport was terrible, the personnel lay the ticket counter charged me for a carry on that fit in the carry on size box, and the two women I spoke with were terribly rude and not willing to help.,,, there was one lady “candy” on the flight crew that was amazing and is the only reason I stayed on the flight at all, because the other stewards helping people to get seated on the plane were terrible

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

The plane was clean, the crew was friendly and helpful. It’s a low cost airline so there was no food, drinks or in flight entertainment but we didn’t expect any of these things. In the room for improvement department, they should install USB ports in seats to charge mobile devices.

The seats were extremely hard and uncomfortable, even for a budget airline.

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

Information on your arrival and departure airports

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