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St. Louis

$58+ Cheap flights from San Diego to St. Louis (SAN - STL)

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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — STL
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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Find cheap flights from San Diego to St. Louis 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

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from San Diego to Lambert-St Louis are usually found in September or February, booked 70 days in advance, depart on a Friday or Thursday and return on a Tuesday

Cheap flight deals from San Diego to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) to St. Louis (STL). 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 November 13, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$129
(Kiwi.com)

One-way from

$58
(Trip.com)

Popular in

December

Cheapest in

September

Average price

$404

Good round-trip deal

$318 or less

Good one-way deal

$166 or less
Provider with most accurate pricing for San Diego-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Diego-Lambert-St Louis flights.
Search Deals
From San Diego to Lambert-St Louis
Search Deals
One-way flight from San Diego to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
Price to beat on a round-trip flight from San Diego to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from San Diego to Lambert-St Louis.
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Find flight deals from San Diego to St. Louis

Cheapest flights from San Diego to St. Louis
Explore the most affordable flight options available from San Diego to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 13, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/10. 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 12/166:34 amSAN - STL
1 stop25h 40mFrontier
Wed 1/77:43 pmSTL - SAN
1 stop25h 32mFrontier
Deal found 11/10$129
This CheapOair deal was found by Cheapflights users on 11/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:34 amSAN - STL
1 stop25h 40mFrontier
Mon 12/157:43 pmSTL - SAN
1 stop6h 16mFrontier
Deal found 11/12$130
This CheapOair deal was found by Cheapflights users on 11/11. 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.
Thu 12/43:47 pmSAN - STL
1 stop18h 25mFrontier
Sun 12/71:16 pmSTL - SAN
1 stop25h 22mFrontier
Deal found 11/11$134
This CheapOair deal was found by Cheapflights users on 11/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:25 amSAN - STL
1 stop25h 49mFrontier
Wed 12/107:43 pmSTL - SAN
1 stop25h 32mFrontier
Deal found 11/12$137
This CheapOair deal was found by Cheapflights users on 11/10. 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.
Thu 12/184:47 pmSAN - STL
1 stop15h 15mFrontier
Sun 1/410:10 pmSTL - SAN
1 stop16h 28mFrontier
Deal found 11/10$144
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 12/166:34 amSAN - STL
1 stop25h 40mFrontier
Fri 1/28:42 pmSTL - SAN
1 stop14h 05mFrontier
Deal found 11/10$145
This Kiwi.com deal was found by Cheapflights users on 11/10. 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 12/166:34 amSAN - STL
1 stop25h 40mFrontier
Mon 1/510:10 pmSTL - SAN
1 stop16h 28mFrontier
Deal found 11/10$146
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/217:31 pmSAN - STL
1 stop12h 31mFrontier
Sun 11/237:57 pmSTL - SAN
1 stop14h 04mFrontier
Deal found 11/12$153
This Kiwi.com deal was found by Cheapflights users on 11/10. 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.
Thu 12/184:47 pmSAN - STL
1 stop15h 15mFrontier
Wed 1/77:43 pmSTL - SAN
1 stop25h 32mFrontier
Deal found 11/10$155
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:25 amSAN - STL
1 stop25h 49mFrontier
Fri 12/127:43 pmSTL - SAN
1 stop22h 09mFrontier
Deal found 11/12$156
This Kiwi.com deal was found by Cheapflights users on 11/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/26:25 amSAN - STL
1 stop25h 49mFrontier
Tue 12/93:30 pmSTL - SAN
2 stops33h 16mFrontier
Deal found 11/12$163

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego to St. Louis 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 November 13, 2025.
Use the filters below to find and compare flights from San Diego to St. Louis that are best for you.

Fly from

San Diego

Fly to

St. Louis

Route

Depart

Return

Price

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Thu 12/4

8:10 pm-10:14 am

1 stop12h 04m

Lambert-St Louis

Sat 12/6

7:43 pm-11:59 pm

1 stop6h 16m

$130

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Thu 1/15

11:50 am-6:32 pm

1 stop28h 42m

Lambert-St Louis

Tue 1/20

4:45 pm-11:31 pm

2 stops32h 46m

$162

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Fri 12/5

4:47 pm-10:14 am

1 stop15h 27m

Lambert-St Louis

Mon 12/8

12:07 pm-11:59 pm

2 stops13h 52m

$176

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Mon 12/22

7:21 pm-9:25 pm

1 stop24h 04m

Lambert-St Louis

Sat 1/3

7:43 pm-10:13 am

2 stops16h 30m

$227

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Tue 2/24

6:15 am-2:58 pm

1 stop6h 43m

Lambert-St Louis

Wed 2/25

10:18 am-6:18 pm

1 stop10h 00m

$241

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Wed 12/17

8:00 am-6:33 pm

1 stop8h 33m

Lambert-St Louis

Wed 1/7

6:10 am-10:48 am

1 stop6h 38m

$241

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Wed 12/17

7:50 am-4:49 pm

1 stop6h 59m

Lambert-St Louis

Tue 1/6

5:00 pm-10:47 pm

1 stop7h 47m

$241

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Thu 12/4

11:41 am-11:59 pm

1 stop10h 18m

Lambert-St Louis

Tue 12/9

7:00 am-3:06 pm

1 stop10h 06m

$259

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Wed 12/3

9:50 am-7:10 pm

1 stop7h 20m

Lambert-St Louis

Mon 12/8

2:20 pm-6:12 pm

1 stop5h 52m

$259

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Wed 12/3

9:50 am-7:10 pm

1 stop7h 20m

Lambert-St Louis

Thu 12/11

6:00 am-11:14 am

1 stop7h 14m

$259

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/11

Showing 1-10 of 19 results
1
2

Compare providers for flights from San Diego to St. Louis

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 San Diego to St. Louis in November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapOairPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
JustAirTicketPrice 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 San Diego-St. Louis flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on San Diego-St. Louis flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from San Diego-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Diego-St. Louis flights, Cheapflights users trust CheapOair the most. CheapOair 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 San Diego-St. Louis 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 San Diego to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from San Diego 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 San Diego to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from San Diego to St. Louis. Price data was last updated on November 7, 2025.

The best time to book flights from San Diego to St. Louis is 69 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, September is the cheapest month in which you can book a flight from San Diego to St. Louis (average of $71). Flying from San Diego to St. Louis in December is currently the most expensive (average of $227). 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 SAN to STL?

Find hourly flight availability from San Diego to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 13, 2025.

A simple way to save on the total cost of your ticket is to fly from San Diego to St. Louis in the evening. If you’re flexible enough to do this you can expect to save up to 59% on your trip compared to booking a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from San Diego to St. Louis. Price data was last updated on November 2, 2025.

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

The best insider tips for San Diego to St. Louis flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your San Diego to St. Louis trip
Airports
SAN

Plan to arrive at SAN at least two hours before your flight to avoid stress from traffic congestion near the airport.

Read more about SANby Blane Bachelor
STL

Use the MetroLink light rail for a convenient and economical way to reach downtown St. Louis from STL.

Read more about STLby Taryn White
Our travel experts
Blane Bachelor

Blane Bachelor

Expert on SAN

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Taryn White

Taryn White

Expert on STL

Taryn White

Taryn White

Taryn White is a freelance travel writer, digital creator, and travel advisor who has visited nearly 100 countries and all 50 states. She’s familiar with many airports and enjoys beach hopping, boutique hotels, spa experiences, and exploring local culture. Her work has appeared in Travel + Leisure, Condé Nast Traveler, National Geographic, Smithsonian Magazine, AFAR, and more.

Read more

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated November 13, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from San Diego to St. Louis 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
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

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
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

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
8,007 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

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
9,017 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

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
11,051 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

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
3,109 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Entertainment

7.5

Boarding

8.1

Comfort

8.0

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 San Diego to St. Louis. 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 San Diego to St. Louis?

    To fly from San Diego to St. Louis, you need to book a flight from San Diego (SAN) to Lambert-St Louis (STL). Nonstop flights to Lambert-St Louis from San Diego take 3h 30m on average. When it comes time to book airfare, you have a few options: there are 2 outbound flights from San Diego to Lambert-St Louis offered by 5 different airlines.

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

    Flights from San Diego to Lambert-St Louis have been viewed 1 times in the past calendar month.

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

    Airlines like Frontier and Delta fly from San Diego to St. Louis in about 6h 43m. The time it takes to get you to your destination can typically vary by up to 5h 21m. San Diego and St. Louis are separated by a distance of 1553 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Cheapflights users have booked flights from San Diego to St. Louis round-trip from $128. Other airlines that can offer you cheap pricing are Delta, from $184, and American Airlines, from $249. Frontier is priced at 66% lower than the current average price of a flight leaving 3 months from now.

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

    Looking for the cheapest flight from San Diego to St. Louis? While on average our users pay $314, our data indicates the cheapest price to be $113. The most popular route (San Diego - Lambert-St Louis), is priced around $236.

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

    Of the flights from San Diego to St. Louis that have layovers, most of them stop in Phoenix.

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

    Chase Field, Desert Ridge Marketplace, and Heritage Square are currently the most popular points of interest in Phoenix at the moment. Those on a layover in Phoenix interested in visiting Chase Field, Desert Ridge Marketplace, or Heritage Square can do so by traveling 4.0 mi, 16.7 mi, and 4.0 mi, respectively from Phoenix Sky Harbor Intl. Travelers can book a car rental at Phoenix Sky Harbor Intl for about $58 per day to make their sightseeing more efficient.

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

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Diego to St. Louis 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 San Diego to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from San Diego to St. Louis (average of $71). Flying from San Diego to St. Louis in December is currently the most expensive (average of $227). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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Top 5 airlines flying from San Diego to St. Louis

Discover the top 5 airlines that operate flights from San Diego to St. Louis. 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$128Average$288FlexibilityNo cancel feeOn-time62%
DeltaCheapest$184Average$279FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$249Average$337FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$256Average$368FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$306Average$479FlexibilityNo cancel feeOn-time63%

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