San Diego

$55+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SAN
Feb 18 — Feb 251
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The best prices from Lambert-St Louis to San Diego are usually found in April or January, booked 60 days in advance, depart on a Friday or Tuesday and return on a Wednesday

Cheap 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 February 13, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$176
(Mytrip)

One-way from

$55
(Frontier)

Popular in

March

Cheapest in

April

Average price

$334

Good round-trip deal

$429 or less

Good one-way deal

$290 or less
Provider with most accurate pricing for Lambert-St Louis-San Diego flight deals.
Provider most trusted by Cheapflights users for Lambert-St Louis-San Diego flights.
From Lambert-St Louis to San Diego
One-way flight from Lambert-St Louis to San Diego
High demand for flights, 3% potential price rise
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Average for round-trip flights in February 2025
Price to beat on a round-trip flight from Lambert-St Louis to San Diego.
Price to beat on a one-way flight from Lambert-St Louis to San Diego.

Find 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 February 13, 2025.

This CheapOair deal was found by Cheapflights users on 2/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/87:04 pmSTL - SAN
1 stop7h 10mFrontier
Sun 3/166:25 amSAN - STL
1 stop24h 51mFrontier
Deal found 2/13$177
This Expedia deal was found by Cheapflights users on 2/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/127:03 pmSTL - SAN
1 stop7h 17mMultiple Airlines
Wed 3/1911:35 amSAN - STL
1 stop10h 24mMultiple Airlines
Deal found 2/13$273
This Delta deal was found by Cheapflights users on 2/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2611:50 amSTL - SAN
1 stop8h 12mDelta
Sat 3/18:00 amSAN - STL
1 stop8h 01mDelta
Deal found 2/12$277
This United Airlines deal was found by Cheapflights users on 2/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2610:55 amSTL - SAN
1 stop7h 36mUnited Airlines
Sat 3/110:00 amSAN - STL
2 stops8h 44mUnited Airlines
Deal found 2/12$282
This American Airlines deal was found by Cheapflights users on 2/13. 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.
Sat 3/81:51 pmSTL - SAN
1 stop8h 49mAmerican Airlines
Sat 3/154:25 pmSAN - STL
1 stop5h 33mAmerican Airlines
Deal found 2/13$308
This Southwest deal was found by Cheapflights users on 2/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/46:00 amSTL - SAN
Nonstop4h 10mSouthwest
Mon 4/76:10 pmSAN - STL
Nonstop3h 30mSouthwest
Deal found 2/13$363
This Alaska Airlines deal was found by Cheapflights users on 2/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/127:00 amSTL - SAN
2 stops15h 19mAlaska Airlines
Wed 3/194:00 pmSAN - STL
1 stop20h 15mAlaska Airlines
Deal found 2/13$368

Find flights from St. Louis to San Diego within your budget

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 February 13, 2025.

Fly from

St. Louis

Fly to

San Diego

Route

Depart

Return

Price

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 3/8

7:04 pm-12:14 am

1 stop7h 10m

San Diego

Sun 3/16

6:25 am-9:16 am

1 stop24h 51m

$177

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 3/12

7:03 pm-12:20 am

1 stop7h 17m

San Diego

Wed 3/19

11:35 am-11:59 pm

1 stop10h 24m

$273

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 2/26

11:50 am-6:02 pm

1 stop8h 12m

San Diego

Sat 3/1

8:00 am-6:01 pm

1 stop8h 01m

$277

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 2/26

10:55 am-4:31 pm

1 stop7h 36m

San Diego

Sat 3/1

10:00 am-8:44 pm

2 stops8h 44m

$282

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 3/8

1:51 pm-8:40 pm

1 stop8h 49m

San Diego

Sat 3/15

4:25 pm-11:58 pm

1 stop5h 33m

$308

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Fri 4/4

6:00 am-8:10 am

Nonstop4h 10m

San Diego

Mon 4/7

6:10 pm-11:40 pm

Nonstop3h 30m

$363

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Wed 3/12

7:00 am-8:19 pm

2 stops15h 19m

San Diego

Wed 3/19

4:00 pm-2:15 pm

1 stop20h 15m

$368

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Mon 3/10

6:58 pm-12:20 am

1 stop7h 22m

$55

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Mon 3/24

1:00 pm-2:34 pm

3 stops27h 34m

$142

St. LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Tue 2/25

4:00 pm-12:10 am

3 stops34h 10m

$154

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/12

Showing 1-10 of 14 results
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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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*3 stars
Kiwi.comPrice Accuracy3 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
CheapfaremartPrice Accuracy-Trust Score*3 stars

*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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-San Diego flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.

Travel insights for flights from St. Louis to San Diego

Get recent, data-driven insights about flights from St. Louis to San Diego including ideal travel times, pricing trends, and more.

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 February 7, 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 60 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, August is the cheapest month in which you can book a flight from St. Louis to San Diego (average of $286). Flying from St. Louis to San Diego in March is currently the most expensive (average of $366). 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 February 13, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 34% 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 February 10, 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. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in San Diego by month

Plan your trip to San Diego by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in San Diego ranges from 0.0 - 2.3 inches per month. February is typically the wettest month, when rainfall can reach 2.3 in. July is typically the driest time to visit San Diego when rainfall is around 0.0 in.

Temperature in San Diego by month

Plan your trip to San Diego by taking into account the average temperature totals by month.

If weather is an important factor for your trip to San Diego, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 57.2 F).

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 February 13, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta from St. Louis to San Diego to help guide your decision. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.7

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Bhoopal,Nov 2024

STL - BOS

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

Crew

8.7

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Bhoopal,Nov 2024

STL - BOS

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

Crew

8.7

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Bhoopal,Nov 2024

STL - BOS

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

8.0
Very good

Crew

8.7

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Bhoopal,Nov 2024

STL - BOS

Flight was delayed by one hour and 40 minutes. Also baggage was delivered late at Boston. This delay made me miss my connection from Boston to Hyderabad

Crew

8.7

Entertainment

7.6

Overall

8.1

Food

7.1

Boarding

8.2

Comfort

8.1

Reviews

1 / 20

2.0</