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$65+ Cheap flights from St. Louis to San Diego (STL - SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SAN
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Find cheap flights from St. Louis to San Diego with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Lambert-St Louis to San Diego are usually found in October or September, booked 78 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap flight deals from St. Louis to San Diego

Cheapest flights from St. Louis to San Diego
Explore the most affordable flight options available from St. Louis to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This Gotogate deal was found by Cheapflights users on 12/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2210:10 pmSTL - SAN
1 stop16h 01mFrontier
Fri 12/264:47 pmSAN - STL
1 stop15h 15mFrontier
Deal found 12/12$333
This CheapOair deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2310:10 pmSTL - SAN
1 stop16h 01mFrontier
Wed 1/147:10 amSAN - STL
1 stop5h 38mFrontier
Deal found 12/15$363
This CheapOair deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:10 pmSTL - SAN
1 stop16h 01mFrontier
Tue 1/67:00 amSAN - STL
1 stop25h 02mFrontier
Deal found 12/14$364
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/228:52 pmSTL - SAN
1 stop15h 05mFrontier
Mon 12/292:10 pmSAN - STL
2 stops29h 15mFrontier
Deal found 12/14$374
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:48 amSTL - SAN
2 stops49h 09mFrontier
Wed 1/79:43 amSAN - STL
1 stop24h 29mFrontier
Deal found 12/14$378
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/198:42 pmSTL - SAN
1 stop14h 05mFrontier
Mon 12/292:10 pmSAN - STL
2 stops29h 15mFrontier
Deal found 12/14$391
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/228:52 pmSTL - SAN
1 stop15h 05mFrontier
Wed 12/3110:57 amSAN - STL
2 stops45h 05mFrontier
Deal found 12/14$392
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/228:52 pmSTL - SAN
1 stop15h 05mFrontier
Thu 1/19:14 pmSAN - STL
2 stops10h 31mFrontier
Deal found 12/14$395
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:10 pmSTL - SAN
1 stop16h 28mFrontier
Mon 12/292:10 pmSAN - STL
2 stops29h 15mFrontier
Deal found 12/14$408
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/198:42 pmSTL - SAN
1 stop14h 05mFrontier
Wed 12/3110:57 amSAN - STL
2 stops45h 05mFrontier
Deal found 12/14$409
This American Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/248:00 amSTL - SAN
1 stop6h 04mAmerican Airlines
Wed 1/76:15 amSAN - STL
1 stop5h 38mAmerican Airlines
Deal found 12/13$410

Find flight deals from St. Louis to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 15, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$131
(Kiwi.com)

One-way from

$65
(WAYA)

Popular in

December

Cheapest in

October

Average price

$475

Good round-trip deal

$439 or less

Good one-way deal

$174 or less
Provider with most accurate pricing for Lambert-St Louis-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-San Diego flights.
Search Deals
From Lambert-St Louis to San Diego
Search Deals
One-way flight from Lambert-St Louis to San Diego
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($32 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to San Diego.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to San Diego.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from St. Louis to San Diego that are best for you.

Fly from

St. Louis

Fly to

San Diego

Route

Depart

Return

Price

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Thu 1/22

5:42 pm-7:21 pm

2 stops27h 39m

San Diego

Sun 1/25

8:16 pm-12:50 pm

1 stop14h 34m

$230

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Thu 3/12

8:06 pm-4:13 pm

1 stop22h 07m

San Diego

Mon 3/16

9:58 pm-12:15 pm

1 stop12h 17m

$302

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Mon 2/2

2:50 pm-9:32 am

2 stops20h 42m

San Diego

Thu 2/5

7:03 pm-1:54 pm

1 stop16h 51m

$314

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Fri 1/23

2:50 pm-11:09 pm

1 stop10h 19m

San Diego

Wed 1/28

3:10 pm-1:54 pm

2 stops20h 44m

$314

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 3/4

5:50 pm-11:02 pm

1 stop7h 12m

San Diego

Sat 3/7

10:59 am-11:23 pm

2 stops10h 24m

$316

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 3/4

5:00 pm-10:50 pm

1 stop7h 50m

San Diego

Mon 3/9

11:15 am-12:18 am

2 stops11h 03m

$316

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Tue 1/27

2:50 pm-8:58 pm

1 stop8h 08m

San Diego

Sat 1/31

7:03 pm-1:54 pm

1 stop16h 51m

$316

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 2/18

7:00 am-12:13 pm

1 stop7h 13m

San Diego

Wed 3/11

11:15 am-12:18 am

2 stops11h 03m

$316

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 1/17

9:57 am-3:36 pm

1 stop7h 39m

San Diego

Sat 1/24

10:52 am-7:27 pm

1 stop6h 35m

$317

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Thu 1/15

6:00 pm-10:37 pm

1 stop6h 37m

San Diego

Mon 1/19

12:11 pm-10:00 pm

1 stop7h 49m

$336

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 19 results
1
2

Compare providers for flights from St. Louis to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to San Diego in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-San Diego flights, users find the pricing of Gotogate to be most consistent on Cheapflights vs. Gotogate Users can find the same prices on St. Louis-San Diego flight deals on Cheapflights vs. Gotogate >95% of the time. Price accuracy is based on data collected from St. Louis-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-San Diego flights, Cheapflights users trust Gotogate the most. Gotogate has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to San Diego. Price data was last updated on December 12, 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to San Diego, you should look to book at least 78 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from St. Louis to San Diego?

Currently, November is the cheapest month in which you can book a flight from St. Louis to San Diego (average of $67). Flying from St. Louis to San Diego in May is currently the most expensive (average of $220). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to SAN?

Find hourly flight availability from St. Louis to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 15, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 23% on flights from St. Louis to San Diego by exploring options for tickets in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to San Diego. Price data was last updated on December 13, 2025.

Travelers seeking maximum savings on their St. Louis to San Diego flight should consider departing on Sunday at noon when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated December 15, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from St. Louis to San Diego to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

7.9

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

7.9

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
7.9
Good
8,008 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

7.9

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
9,092 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

7.9

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
11,052 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

7.9

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,080 reviews
Southwest
7.9
Good
4,250 reviews

Boarding

8.1

Crew

8.6

Entertainment

7.5

Comfort

8.0

Overall

7.9

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from St. Louis to San Diego?

    If you book a flight from St. Louis to San Diego, you will be flying from Lambert-St Louis to San Diego. Flights to San Diego (SAN) from Lambert-St Louis (STL) take 3h 40m for a nonstop flight. There are 2 flights from Lambert-St Louis to San Diego per day from 5 airlines.

  • How popular is this St. Louis to San Diego flight route?

    Within the past month, 3 users have taken a look at flights from Lambert-St Louis to San Diego.

  • How long is the flight from St. Louis to San Diego?

    Departing from St. Louis to San Diego will take you 20h 42m. The distance between St. Louis and San Diego is about 1553 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from St. Louis to San Diego round-trip?

    Flying on Frontier is currently your cheapest option to San Diego, with prices starting at $86. Additional round-trip tickets that might be worth considering are offered by Delta and United Airlines, with the lowest prices starting at $138 and $182, respectively. You may be able to fly from St. Louis to San Diego for 77% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from St. Louis to San Diego one-way?

    The cheapest airlines for a one-way flight from St. Louis to San Diego are Frontier ($63), American Airlines ($113), and Delta ($128).

  • What are the cheapest flights from St. Louis to San Diego?

    Looking for the cheapest flight from St. Louis to San Diego? While on average our users pay $381, our data indicates the cheapest price to be $149. The most popular route (Lambert-St Louis - San Diego), is priced around $232.

  • Where are the most common layover locations when flying from St. Louis to San Diego?

    St. Louis to San Diego flights have a layover in Denver most often.

  • What are some popular things to do or see while on a layover in Denver?

    The majority of Denver visitors spend their time at Coors Field, 16th Street Mall, and Paramount Theatre. Travelers on a layover in Denver can visit Coors Field, 16th Street Mall, and Paramount Theatre, by traveling 18.4 mi, 18.7 mi, and 18.6 mi, respectively after landing at Denver Intl. Travelers can rent a car at Denver Intl for an average daily rate of $43 to make sightseeing during their layover a little easier.

  • Where are the least popular layover locations for St. Louis to San Diego flights?

    St. Louis to San Diego flights have a layover in Phoenix the least frequently.

  • Can I find deals for flights from St. Louis to San Diego that include hotel bookings?

    Yes. In addition to deals on St. Louis to San Diego flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to San Diego.

  • Can I find deals for business class flights from St. Louis to San Diego?

    Yes. Cheapflights offers flight deals from St. Louis to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, November is the cheapest month in which you can book a flight from St. Louis to San Diego (average of $67). Flying from St. Louis to San Diego in May is currently the most expensive (average of $220). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
Coronado
National City
La Mesa
Poway
Julian
Lemon Grove

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Alternative routes for St. Louis to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from St. Louis to San Diego

Discover the top 5 airlines that operate flights from St. Louis to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$88Average$198FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$182Average$333FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$237Average$322FlexibilityNo cancel feeOn-time71%
DeltaCheapest$256Average$301FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$304Average$471FlexibilityNo cancel feeOn-time63%

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