Cheap flights from St. Louis to San Diego (STL - SAN) from $45

This is the cheapest one-way flight price, found on 9/27. Prices may vary by date and flight preferences.
STL — SAN
Oct 3 — Oct 101

The best prices from Lambert-St Louis to San Diego are usually found in September or October, booked 26 days in advance, depart on a Tuesday or Saturday and return on a Friday

How to find the cheapest flight from St. Louis (STL) to San Diego (SAN)

All the information you need to plan the best STL to SAN flight in 2023: compare St. Louis to San Diego flight prices with the expected peak season, weather and rainfall in San Diego.

Popular in

December

Cheapest in

September

Round-trip from

$277

One-way from

$115
High demand for flights, 23% potential price rise
Best time to find cheap flights, 24% potential price drop
From Lambert-St Louis to San Diego
One-way flight from Lambert-St Louis to San Diego

STL - SAN

Price

$277 - $532

SAN

Temperature

57.2 - 71.6 °F

SAN

Rainfall

0 - 2.3 inches

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

Flying to your destination on a Thursday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to San Diego. Check prices with Cheapflights to find a great deal for your trip.

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

Travelers have found it’s best to book a flight 27 days in advance to save up to 14% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 27 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to San Diego 1-2 weeks in advance for as low as $356, or $395 for flights within the next 24 hours.

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

The best pricing can be found in the month of September. Prices to San Diego from St. Louis average $377. You can even find prices in September for less than $377, as users have found deals to San Diego from as low as $150. The month of December appears to be one of the more expensive times to travel to San Diego from St. Louis. Flying in the targeted month can save you up to 29%.

When is the cheapest time to fly from St. Louis to San Diego (STL - SAN)?

Unlike at noon, when flights are generally more expensive, you can save up to 26% on flights from St. Louis to San Diego by exploring options for tickets in the evening.

Cheap American Airlines flights from St. Louis to San Diego

Take a peek at the cheapest American Airlines flights we've detected traveling from St. Louis to San Diego. Come back soon if you're not finding the exact deal you're looking for.

Cheap Frontier flights from St. Louis to San Diego

To aid your search, here are some of the cheapest Frontier flights we've found from St. Louis to San Diego. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.

Cheap St. Louis to San Diego flights in September & October 2023

The best prices found for STL to SAN flights for September, October
These are some of the most attractive deals on flights from St. Louis to San Diego in 2023. Check back in a little while for more flight options.

St. Louis to San Diego 2023 flight deals

Cheap flights to San Diego from St. Louis found for this year
These are some of the most attractive deals on flights from St. Louis to San Diego in 2023. Check back in a little while for more flight options.

St. Louis to San Diego flights leaving soon

Late deals on return flights to San Diego from St. Louis, departing today and this week
Have a look at some of the last-minute flights available departing from St. Louis to San Diego. To prevent any unwanted surprises, users should verify their flight info before booking.

One-way flights to San Diego from St. Louis

The cheapest one-way flights from St. Louis to San Diego
Users in need of a one-way flight from St. Louis to San Diego can choose from these deals. Users in need of a round-trip flight from St. Louis to San Diego instead should update the search form at the top of page.

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

Use the slider to find flights from St. Louis to San Diego that fit your budget.

Fly from

Any airport

Fly to

Any airport

Budget

$103 - $259

Route

Depart

Return

Price

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 12/2

1 stop19h 55m

San Diego

Tue 12/5

1 stop11h 21m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Tue 10/17

1 stop10h 02m

San Diego

Wed 10/18

2 stops15h 55m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sun 11/5

1 stop16h 37m

San Diego

Fri 11/10

1 stop10h 58m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 12/2

1 stop19h 55m

San Diego

Wed 12/6

1 stop13h 39m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Tue 10/17

1 stop10h 02m

San Diego

Thu 10/26

2 stops16h 08m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 12/2

1 stop19h 55m

San Diego

Tue 12/5

1 stop6h 35m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Tue 10/17

1 stop7h 49m

San Diego

Thu 10/26

1 stop11h 04m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Sat 12/2

2 stops7h 42m

San Diego

Tue 12/5

2 stops8h 04m

Lambert-St LouisSan Diego

STL - SAN

STLSAN

Lambert-St Louis

Fri 10/13

3 stops24h 21m

San Diego

Mon 10/16

3 stops20h 39m

Flights are sorted by cheapest first

Deals found on 9/27

Reviews of airlines servicing San Diego

Peruse reviews from past customers who have flown with American Airlines, Frontier and Spirit Airlines 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.
Alaska Airlines
8.1
Very good
1,394 reviews

Entertainment

7.2

Food

7.2

Comfort

8.0

Overall

8.1

Boarding

8.3

Crew

8.6

Reviews

1 / 10

The line at TSA took me 2.5-3 hours to get through and I was behind on my flight time by 20 minutes. I was told some flights would be delayed and they would wait but when I arrived the flight had already taken off. I showed up on time and even then 2 and a half hours was not enough time to make my flight. I had to rent a car and drive from Vegas to San Diego at 8:00pm. I just hoped the airport would have notified their passengers a lot better.

Alaska Airlines
8.1
Very good
1,394 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Entertainment

7.2

Food

7.2

Comfort

8.0

Overall

8.1

Boarding

8.3

Crew

8.6

Reviews

1 / 10

The line at TSA took me 2.5-3 hours to get through and I was behind on my flight time by 20 minutes. I was told some flights would be delayed and they would wait but when I arrived the flight had already taken off. I showed up on time and even then 2 and a half hours was not enough time to make my flight. I had to rent a car and drive from Vegas to San Diego at 8:00pm. I just hoped the airport would have notified their passengers a lot better.

Delta
7.9
Good
3,023 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Entertainment

7.2

Food

7.2

Comfort

8.0

Overall

8.1

Boarding

8.3

Crew

8.6

Reviews

1 / 10

The line at TSA took me 2.5-3 hours to get through and I was behind on my flight time by 20 minutes. I was told some flights would be delayed and they would wait but when I arrived the flight had already taken off. I showed up on time and even then 2 and a half hours was not enough time to make my flight. I had to rent a car and drive from Vegas to San Diego at 8:00pm. I just hoped the airport would have notified their passengers a lot better.

Southwest
7.6
Good
1,521 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Entertainment

7.2

Food

7.2

Comfort

8.0

Overall

8.1

Boarding

8.3

Crew

8.6

Reviews

1 / 10

The line at TSA took me 2.5-3 hours to get through and I was behind on my flight time by 20 minutes. I was told some flights would be delayed and they would wait but when I arrived the flight had already taken off. I showed up on time and even then 2 and a half hours was not enough time to make my flight. I had to rent a car and drive from Vegas to San Diego at 8:00pm. I just hoped the airport would have notified their passengers a lot better.

United Airlines
7.4
Good
1,890 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Entertainment

7.2

Food

7.2

Comfort

8.0

Overall

8.1

Boarding

8.3

Crew

8.6

Reviews

1 / 10

The line at TSA took me 2.5-3 hours to get through and I was behind on my flight time by 20 minutes. I was told some flights would be delayed and they would wait but when I arrived the flight had already taken off. I showed up on time and even then 2 and a half hours was not enough time to make my flight. I had to rent a car and drive from Vegas to San Diego at 8:00pm. I just hoped the airport would have notified their passengers a lot better.

American Airlines
7.2
Good
2,635 reviews
Alaska Airlines
8.1
Very good
1,394 reviews

Entertainment

7.2

Food

7.2

Comfort

8.0

Overall

8.1

Boarding

8.3

Crew

8.6

Reviews

1 / 10

The line at TSA took me 2.5-3 hours to get through and I was behind on my flight time by 20 minutes. I was told some flights would be delayed and they would wait but when I arrived the flight had already taken off. I showed up on time and even then 2 and a half hours was not enough time to make my flight. I had to rent a car and drive from Vegas to San Diego at 8:00pm. I just hoped the airport would have notified their passengers a lot better.

Related info for your journey

Useful info, stats and facts about St. Louis to San Diego flights.

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 5h 45m for a nonstop flight. There is 1 flight from Lambert-St Louis to San Diego per day from 6 airlines.

Can I find flights from St. Louis to San Diego for under $200 on Cheapflights?

Yes, there are multiple flights from St. Louis to San Diego for under $200. The cheapest flight booked recently is on Frontier for just $103, but on average you can expect to pay $136.

Are there last-minute flights available from St. Louis to San Diego for under $200?

There are currently 20+ open flights from St. Louis to San Diego within the next 7 days for less than $200.

What days are nonstop flights available from St. Louis to San Diego?

Days when nonstop flights are available for this flight are: Friday, Saturday.

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

How many flights depart from St. Louis to San Diego on average per day?

4 flight departures from St. Louis to San Diego per day on average.
Early Morning (Midnight to 6am) - 25% of flight departures
Morning (6am - Noon) - 25% of flight departures
Afternoon (Noon - 6pm) - 50% of flight departures

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

Departing from St. Louis to San Diego will take you 19h 55m. The distance between St. Louis and San Diego is about 1562 mi.

What is the cheapest airline to fly from St. Louis to San Diego round-trip?

Flying on Frontier is currently your cheapest option to San Diego, with prices starting at $103. You may be able to fly from St. Louis to San Diego for 72% less than the average price by searching for this airline.

What are the most popular airlines that fly from St. Louis to San Diego?

What does STL to SAN mean?

STL and SAN are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. STL to SAN refers to a flight route from Lambert-St Louis Airport to San Diego Airport.

Alternative routes for St. Louis to San Diego

See prices for flight routes from nearby airports that may be better suited for you.

Top 6 airlines flying from St. Louis to San Diego

The chart below displays the airlines Cheapflights users traveling from St. Louis to San Diego choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$132Average$222FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Spirit AirlinesCheapest$137Average$239FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
United AirlinesCheapest$298Average$437FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$298Average$456FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$310Average$496FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Alaska AirlinesCheapest$412Average$590FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Hourly flight availability from St. Louis to San Diego

See what time of day planes typically take off from St. Louis to San Diego
1%of flight departuresEarly morningMidnight to 6 am
82%of flight departuresMorning6 am to noon
17%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to San Diego

See how many times per day planes take to the skies headed from St. Louis to San Diego
Sunday3daily flights
Monday1daily flight
Tuesday1daily flight
Wednesday1daily flight
Thursday1daily flight
Friday1daily flight
Saturday1daily flight

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How does Cheapflights help users find flights from St. Louis to San Diego?

When you search for this flight from St. Louis to San Diego, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to San Diego?

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