$89+ 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 5/29. Fares are subject to change and may not be available on all flights or dates of travel.
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
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 Lambert-St Louis to San Diego are usually found in January or August, booked 78 days in advance, depart on a Tuesday or Wednesday 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 April 29, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $257 (Delta) |
One-way from | $89 (Frontier) |
Popular in | March |
Cheapest in | January |
Average price | $317 |
Good round-trip deal | $415 or less |
Good one-way deal | $176 or less |
Find flight deals from St. Louis to San Diego
Cheapest flights from St. Louis to San DiegoExplore 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 April 29, 2025.
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 April 29, 2025.
This Delta deal was found by Cheapflights users on 4/29. 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.
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 4/29. 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.
This United Airlines deal was found by Cheapflights users on 4/29. 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.
This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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.
This American Airlines deal was found by Cheapflights users on 4/29. 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.
This Mytrip deal was found by Cheapflights users on 4/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight 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 April 29, 2025.
Use the filters below to find and compare flights from St. Louis to San Diego that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Mon 6/16
1:30 pm-9:19 pm
1 stop9h 49m
San Diego
Mon 6/23
10:30 pm-9:43 am
1 stop9h 13m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Mon 5/26
2:25 pm-6:26 pm
1 stop6h 01m
San Diego
Fri 5/30
7:19 pm-10:09 am
1 stop12h 50m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Tue 5/13
4:50 pm-9:22 pm
1 stop6h 32m
San Diego
Fri 5/16
7:45 am-5:07 pm
1 stop7h 22m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Wed 5/28
5:25 pm-10:05 pm
1 stop6h 40m
San Diego
Tue 6/3
8:45 am-5:50 pm
2 stops7h 05m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Mon 6/9
7:00 am-11:56 pm
2 stops18h 56m
San Diego
Wed 6/11
8:48 pm-10:33 am
2 stops35h 45m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Thu 7/10
5:15 am-10:41 am
1 stop7h 26m
San Diego
Sun 7/13
10:45 pm-7:56 am
1 stop7h 11m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Mon 8/4
8:44 am-7:28 am
2 stops24h 44m
San Diego
Mon 8/11
1:00 pm-6:32 pm
3 stops27h 32m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Wed 5/28
10:31 am-8:03 pm
2 stops11h 32m
San Diego
Sun 6/1
6:53 pm-9:54 am
2 stops13h 01m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Thu 5/29
2:25 pm-6:26 pm
1 stop6h 01m
St. LouisSan Diego
STL - SAN
STLSAN
Lambert-St Louis
Tue 7/29
9:31 am-3:23 pm
1 stop7h 52m
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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on St. Louis-San Diego flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on St. Louis-San Diego flight deals on Cheapflights vs. CheapOair >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 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 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.
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 April 25, 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, 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 April 29, 2025.
Unlike at noon, when flights are generally more expensive, you can save up to 10% 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 March 30, 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 April 29, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest 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.
Boarding
Crew
Entertainment
Overall
Food
Comfort
Reviews
James,Apr 2025
LAX - SFO
Boarding
Crew
Entertainment
Overall
Food
Comfort
Reviews
James,Apr 2025
LAX - SFO
Boarding
Crew
Entertainment
Overall
Food
Comfort
Reviews
James,Apr 2025
LAX - SFO
Boarding
Crew
Entertainment
Overall
Food
Comfort
Reviews
James,Apr 2025
LAX - SFO
Boarding
Crew
Entertainment
Overall
Food
Comfort
Reviews
James,Apr 2025
LAX - SFO
Boarding
Crew
Entertainment
Overall
Food
Comfort
Reviews
James,Apr 2025
LAX - SFO
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.
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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.
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 April 29, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$198 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$220 | Average$319 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$245 | Average$289 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$246 | Average$361 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$320 | Average$488 | FlexibilityNo cancel fee | On-time63% |