What airlines fly to San Diego?

Southwest, American Airlines and Frontier are the top three most popular airlines that fly to San Diego from St. Louis according to our data. Southwest is the first choice among our users, with 37% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 5 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

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

The number of flights available between St. Louis and San Diego is 10 per week as of July 2025. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.

What is the cheapest airline that flies from Lambert-St Louis to San Diego?

Frontier, Spirit Airlines, and American Airlines are the most popular carriers operating from Lambert-St Louis to San Diego

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

As of July 2025, 1 flights take off from St. Louis and land in San Diego each day. The most common flight departure time for this route is 3:00PM, with 61% of daily flights taking off in the afternoon.

When did momondo last update prices for flights from Lambert-St Louis Airport to San Diego Airport?

Prices for flights from Lambert-St Louis Airport to San Diego Airport are updated daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to San Diego Airport?

The number of operators available for flights from Lambert-St Louis Airport to San Diego Airport is 5 as of July 2025.

How old do you have to be to fly from Lambert-St Louis Airport to San Diego Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Diego Airport.

What documentation or ID do you need to fly to San Diego Airport?

The travel and health documents you'll need for your trip to San Diego Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Diego Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$92 Cheap Flights from St. Louis to San Diego in 2025

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Find the cheapest flights from St. Louis to San Diego

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

11:24 am - 9:55 amSTL-SAN

24h 31m2 stops

7:00 pm - 9:52 amSAN-STL

12h 52m2 stops

$235Spirit Airlines

Find Deal

Wed, Jul 30 - Wed, Aug 6

7:54 pm - 7:31 pmSTL-SAN

25h 37m1 stop

8:36 pm - 9:11 amSAN-STL

10h 35m1 stop

$239Frontier

Find Deal

Wed, Aug 20 - Sun, Aug 24

3:34 pm - 9:55 amSTL-SAN

20h 21m2 stops

7:00 pm - 9:52 amSAN-STL

12h 52m2 stops

$241Spirit Airlines

Find Deal

Sat, Aug 2 - Wed, Aug 6

6:10 am - 2:03 pmSTL-SAN

9h 53m1 stop

6:15 am - 3:09 pmSAN-STL

6h 54m1 stop

$250American Airlines

Find Deal

Tue, Sep 23 - Sat, Sep 27

6:06 am - 2:07 pmSTL-SAN

10h 01m1 stop

1:00 pm - 11:55 pmSAN-STL

8h 55m1 stop

$260American Airlines

Find Deal

Tue, Aug 12 - Sat, Aug 16

4:45 pm - 6:30 pmSTL-SAN

3h 45mnonstop

11:45 am - 7:45 pmSAN-STL

6h 00m1 stop

$271Southwest

Find Deal

Tue, Sep 23 - Sat, Sep 27

10:30 am - 3:25 pmSTL-SAN

6h 55m2 stops

9:50 am - 9:00 pmSAN-STL

9h 10m1 stop

$284Southwest

Find Deal

Tue, Aug 12 - Sat, Aug 23

3:35 pm - 11:53 pmSTL-SAN

10h 18m1 stop

9:30 am - 11:59 pmSAN-STL

12h 29m1 stop

$292Alaska Airlines

Find Deal

Mon, Aug 25 - Sun, Aug 31

6:15 am - 10:55 amSTL-SAN

6h 40m1 stop

7:00 am - 4:33 pmSAN-STL

7h 33m1 stop

$300United Airlines

Find Deal

Thu, Aug 21 - Sun, Aug 24

5:00 am - 9:34 amSTL-SAN

6h 34m1 stop

10:54 am - 8:46 pmSAN-STL

7h 52m2 stops

$303United Airlines

Find Deal

Thu, Aug 14 - Thu, Aug 21

Frontier flights from St. Louis to San Diego

Our best Frontier deals on St. Louis to San Diego flight tickets

Frontier

Aug 20

STL7:54 pmLambert-St Louis

25h 37m

1 stop

SAN7:31 pmSan Diego

Aug 24

SAN8:36 pmSan Diego

10h 35m

1 stop

STL9:11 amLambert-St Louis

$239

Find similar

Frontier

Oct 24

STL7:52 pmLambert-St Louis

5h 58m

1 stop

SAN11:50 pmSan Diego

Oct 26

SAN9:03 pmSan Diego

10h 04m

1 stop

STL9:07 amLambert-St Louis

$244

Find similar

Frontier

Aug 18

STL7:29 pmLambert-St Louis

6h 23m

1 stop

SAN11:52 pmSan Diego

Aug 25

SAN9:11 pmSan Diego

10h 00m

1 stop

STL9:11 amLambert-St Louis

$245

Find similar

American Airlines flights from St. Louis to San Diego

Our best American Airlines deals on St. Louis to San Diego flight tickets

American Airlines

Sep 23

STL6:10 amLambert-St Louis

9h 53m

1 stop

SAN2:03 pmSan Diego

Sep 27

SAN6:15 amSan Diego

6h 54m

1 stop

STL3:09 pmLambert-St Louis

$250

Find similar

American Airlines

Aug 12

STL6:06 amLambert-St Louis

10h 01m

1 stop

SAN2:07 pmSan Diego

Aug 16

SAN1:00 pmSan Diego

8h 55m

1 stop

STL11:55 pmLambert-St Louis

$260

Find similar

American Airlines

Aug 12

STL6:06 amLambert-St Louis

10h 01m

1 stop

SAN2:07 pmSan Diego

Aug 16

SAN10:15 amSan Diego

8h 01m

1 stop

STL8:16 pmLambert-St Louis

$266

Find similar

How to get the cheapest flight ticket from St. Louis to San Diego

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to San Diego?

If you are unable to visit San Diego during the month of January, then departing from St. Louis during the month February is also very affordable. Most momondo users find prices during this month for around $334.

What is the cheapest day to depart on your flight to San Diego?

The cheapest day to depart from St. Louis to San Diego is on a Tuesday. Travelers who choose to depart for San Diego on a Tuesday will often find tickets for as low as $479. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $621. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.

What is the cheapest time of day to depart on your flight to San Diego?

The cheapest time of day to fly to San Diego is in the afternoon when flights can be purchased for as low as $509. Flights at noon are often more expensive with an average ticket price of $571.

What is the cheapest Lambert-St Louis to San Diego flight route?

Fly from Lambert-St Louis to San Diego for the best Lambert-St Louis - San Diego flight prices

How far in advance should I book a flight to San Diego?

You are more likely to see cheaper flights to San Diego from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $355 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from St. Louis for as low as $298 on momondo.

What cabin class options are available on Lambert-St Louis to San Diego flights?

There are 1 cabin classes available to choose from on Lambert-St Louis to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have St. Louis to San Diego flight prices changed over time?

As of July 2025, prices for St. Louis to San Diego flights are approximately 37% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to San Diego

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to San Diego according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to San Diego (STL to SAN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Diego

Best Price Found	$92
Fastest flight time	3h 45m
Direct flights	Every day
Airports in San Diego	1 airport

The best one-way flight to San Diego from St. Louis in the past 72 hours is $92. The best round-trip flight deal from St. Louis to San Diego found on momondo in the last 72 hours is $235.

The fastest flight from St. Louis to San Diego takes 3h 45m

Direct flights go from St. Louis to San Diego every day.

There is 1 airport near San Diego: San Diego (SAN)

Search flight deals

How far is Lambert-St Louis to San Diego by plane?
There are 1560.0 mi between Lambert-St Louis and San Diego. By plane, this route typically takes 3h 45m.
When did momondo last update prices for flights from Lambert-St Louis Airport to San Diego Airport?
Prices for flights from Lambert-St Louis Airport to San Diego Airport are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to San Diego Airport?
The number of operators available for flights from Lambert-St Louis Airport to San Diego Airport is 5 as of July 2025.
How old do you have to be to fly from Lambert-St Louis Airport to San Diego Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to San Diego Airport.
What documentation or ID do you need to fly to San Diego Airport?
The travel and health documents you'll need for your trip to San Diego Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at San Diego Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to San Diego?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to San Diego is Boeing 737-700 Passenger/BBJ1 (winglets) (42.39% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (30.43%), Boeing 737-800 Passenger/BBJ2 (winglets) (19.57%), and Airbus A319 (3.26%).
What is the most popular airline from St. Louis to San Diego?
Based on momondo bookings for flights between St. Louis and San Diego, the leading airline is Southwest, making up 35% of the total bookings. Other popular airlines include American Airlines with 27%, Delta with 14%, and Frontier with 12%.

Best airlines flying from St. Louis to San Diego

Compare and see reviews for airlines that fly from St. Louis to San Diego with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $108	Free Cancellation	Rating 5.9 3,251 reviews	Search Frontier flights
American Airlines	PriceFrom $235	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
United Airlines	PriceFrom $247	Free Cancellation	Rating 7.4 8,864 reviews	Search United Airlines flights
Delta	PriceFrom $250	Free Cancellation	Rating 8.0 7,958 reviews	Search Delta flights
Southwest	PriceFrom $319	Free Cancellation	Rating 8.0 4,241 reviews	Search Southwest flights

Southwest Flights From St. Louis to San Diego
The lowest priced Southwest flight from St. Louis to San Diego from the last 72 hours was $319. Generally, Southwest has 10 flights on this route every week with an average price of $490. Southwest is rated 8.0/10 by our users.

Coronado

El Cajon

Chula Vista

Julian

National City

La Mesa

Imperial Beach

San Ysidro

Poway

Borrego Springs

Lemon Grove

Alpine

Santee

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to San Diego?

Finding the right flight to San Diego from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to San Diego quick and easy, saving you time and money.

Can I find flights from St. Louis to San Diego with flexible booking policies on momondo?

Flights from St. Louis to San Diego with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to San Diego?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to San Diego.

I’m not ready to book a flight from St. Louis to San Diego right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to San Diego from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Cheap flights from St. Louis to San Diego from $92

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to San Diego departing on 8/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Frontier flights from St. Louis to San Diego

Our best Frontier deals on St. Louis to San Diego flight tickets

American Airlines flights from St. Louis to San Diego

Our best American Airlines deals on St. Louis to San Diego flight tickets

See travel insights to San Diego from

How to get the cheapest flight ticket from St. Louis to San Diego

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to San Diego?

If you are unable to visit San Diego during the month of January, then departing from St. Louis during the month February is also very affordable. Most momondo users find prices during this month for around $334.

What is the cheapest day to depart on your flight to San Diego?

What is the cheapest time of day to depart on your flight to San Diego?

The cheapest time of day to fly to San Diego is in the afternoon when flights can be purchased for as low as $509. Flights at noon are often more expensive with an average ticket price of $571.

What is the cheapest Lambert-St Louis to San Diego flight route?

Fly from Lambert-St Louis to San Diego for the best Lambert-St Louis - San Diego flight prices

How far in advance should I book a flight to San Diego?

What cabin class options are available on Lambert-St Louis to San Diego flights?

There are 1 cabin classes available to choose from on Lambert-St Louis to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have St. Louis to San Diego flight prices changed over time?

As of July 2025, prices for St. Louis to San Diego flights are approximately 37% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Lambert-St Louis to San Diego?

Frontier, Spirit Airlines, and American Airlines are the most popular carriers operating from Lambert-St Louis to San Diego

What airlines fly to San Diego?

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

As of July 2025, 1 flights take off from St. Louis and land in San Diego each day. The most common flight departure time for this route is 3:00PM, with 61% of daily flights taking off in the afternoon.

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

The number of flights available between St. Louis and San Diego is 10 per week as of July 2025. The most frequent departure day is Mon, with 20% of weekly flights leaving on this day.

When to book flights from St. Louis to San Diego

Cheap St. Louis to San Diego (STL to SAN) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Diego

Best Price Found

Fastest flight time

Direct flights

Airports in San Diego

How far is Lambert-St Louis to San Diego by plane?

When did momondo last update prices for flights from Lambert-St Louis Airport to San Diego Airport?

How many operators does momondo search for flights from Lambert-St Louis Airport to San Diego Airport?

How old do you have to be to fly from Lambert-St Louis Airport to San Diego Airport?

What documentation or ID do you need to fly to San Diego Airport?

What is the most popular plane model from St. Louis to San Diego?

What is the most popular airline from St. Louis to San Diego?

Best airlines flying from St. Louis to San Diego

Compare and see reviews for airlines that fly from St. Louis to San Diego with momondo

Southwest Flights From St. Louis to San Diego

Traveling to a place near San Diego?

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to San Diego?

Can I find flights from St. Louis to San Diego with flexible booking policies on momondo?

How can momondo help me find flights from St. Louis to San Diego?

I’m not ready to book a flight from St. Louis to San Diego right now. Can momondo alert me if prices change?

An easier way to manage your San Diego trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing California