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Cheap flights from San Diego to St. Louis from $55

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Diego to St. Louis departing on 2/4. 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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Find the cheapest flights from San Diego to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:16 pm - 2:46 pm
SAN
-
STL
16h 30m1 stop
Frontier Logo
1:40 pm - 12:08 am
STL
-
SAN
12h 28m1 stop
$132Frontier
Fri, Jan 30 - Mon, Feb 2
Frontier Logo
9:09 am - 1:09 pm
SAN
-
STL
26h 00m1 stop
Frontier Logo
5:18 pm - 5:51 pm
STL
-
SAN
26h 33m2 stops
$147Frontier
Sun, Mar 1 - Wed, Mar 4
Frontier Logo
10:34 am - 11:18 am
SAN
-
STL
22h 44m1 stop
Frontier Logo
1:40 pm - 12:08 am
STL
-
SAN
12h 28m1 stop
$156Frontier
Sat, Jan 31 - Mon, Feb 2
Frontier Logo
7:00 am - 11:33 pm
SAN
-
STL
38h 33m2 stops
Frontier Logo
7:39 pm - 11:31 pm
STL
-
SAN
29h 52m1 stop
$157Frontier
Tue, Feb 3 - Fri, Feb 6
Frontier Logo
2:56 pm - 8:48 pm
SAN
-
STL
27h 52m1 stop
Frontier Logo
1:40 pm - 12:08 am
STL
-
SAN
12h 28m1 stop
$158Frontier
Thu, Jan 22 - Mon, Jan 26
Frontier Logo
8:16 pm - 2:46 pm
SAN
-
STL
16h 30m1 stop
Frontier Logo
9:45 pm - 11:31 pm
STL
-
SAN
27h 46m2 stops
$161Frontier
Fri, Jan 30 - Mon, Feb 2
Frontier Logo
11:59 am - 1:09 pm
SAN
-
STL
23h 10m1 stop
Frontier Logo
10:11 pm - 1:05 pm
STL
-
SAN
16h 54m1 stop
$163Frontier
Thu, Feb 26 - Sun, Mar 1
Frontier Logo
6:25 am - 1:56 pm
SAN
-
STL
29h 31m1 stop
Frontier Logo
10:11 pm - 7:23 pm
STL
-
SAN
23h 12m1 stop
$174Frontier
Fri, Feb 13 - Thu, Feb 19
Frontier Logo
9:09 am - 1:09 pm
SAN
-
STL
26h 00m1 stop
Frontier Logo
5:18 pm - 11:14 am
STL
-
SAN
19h 56m1 stop
$176Frontier
Sun, Mar 1 - Wed, Mar 4
Frontier Logo
2:56 pm - 8:48 pm
SAN
-
STL
27h 52m1 stop
Frontier Logo
12:03 pm - 12:08 am
STL
-
SAN
14h 05m1 stop
$178Frontier
Thu, Jan 29 - Sun, Feb 1

Frontier flights from San Diego to St. Louis

Our best Frontier deals on San Diego to St. Louis flight tickets
Frontier
Feb 27
SAN8:35 amSan Diego
27h 21m
1 stop
STL1:56 pmLambert-St Louis
Mar 2
STL1:54 pmLambert-St Louis
12h 14m
1 stop
SAN12:08 amSan Diego
$128
Find similar
Frontier
Jan 30
SAN8:16 pmSan Diego
16h 30m
1 stop
STL2:46 pmLambert-St Louis
Feb 2
STL1:40 pmLambert-St Louis
12h 28m
1 stop
SAN12:08 amSan Diego
$132
Find similar
Frontier
Jan 28
SAN7:00 amSan Diego
5h 46m
1 stop
STL2:46 pmLambert-St Louis
Jan 29
STL10:01 pmLambert-St Louis
13h 25m
1 stop
SAN9:26 amSan Diego
$145
Find similar

American Airlines flights from San Diego to St. Louis

Our best American Airlines deals on San Diego to St. Louis flight tickets
American Airlines
Jan 18
SAN10:09 amSan Diego
11h 50m
1 stop
STL11:59 pmLambert-St Louis
Jan 27
STL5:04 pmLambert-St Louis
7h 46m
1 stop
SAN10:50 pmSan Diego
$362
Find similar
American Airlines
Jan 20
SAN10:50 amSan Diego
6h 39m
1 stop
STL7:29 pmLambert-St Louis
Jan 23
STL9:34 amLambert-St Louis
8h 23m
1 stop
SAN3:57 pmSan Diego
$475
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated January 7, 2026.
Use the filters below to find and compare flights from San Diego to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Fri 1/30

8:16 pm-2:46 pm

1 stop16h 30m

Lambert-St Louis

Mon 2/2

1:40 pm-12:08 am

1 stop12h 28m

$132

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Sun 3/1

9:09 am-1:09 pm

1 stop26h 00m

Lambert-St Louis

Wed 3/4

5:18 pm-5:51 pm

2 stops26h 33m

$147

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Sat 1/31

10:34 am-11:18 am

1 stop22h 44m

Lambert-St Louis

Mon 2/2

1:40 pm-12:08 am

1 stop12h 28m

$156

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Tue 2/3

7:00 am-11:33 pm

2 stops38h 33m

Lambert-St Louis

Fri 2/6

7:39 pm-11:31 pm

1 stop29h 52m

$157

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Thu 1/22

2:56 pm-8:48 pm

1 stop27h 52m

Lambert-St Louis

Mon 1/26

1:40 pm-12:08 am

1 stop12h 28m

$158

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Fri 1/30

8:16 pm-2:46 pm

1 stop16h 30m

Lambert-St Louis

Mon 2/2

9:45 pm-11:31 pm

2 stops27h 46m

$161

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Thu 2/26

11:59 am-1:09 pm

1 stop23h 10m

Lambert-St Louis

Sun 3/1

10:11 pm-1:05 pm

1 stop16h 54m

$163

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Fri 2/13

6:25 am-1:56 pm

1 stop29h 31m

Lambert-St Louis

Thu 2/19

10:11 pm-7:23 pm

1 stop23h 12m

$174

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Sun 3/1

9:09 am-1:09 pm

1 stop26h 00m

Lambert-St Louis

Wed 3/4

5:18 pm-11:14 am

1 stop19h 56m

$176

San DiegoSt. Louis

SAN - STL

SANSTL

San Diego

Thu 1/29

2:56 pm-8:48 pm

1 stop27h 52m

Lambert-St Louis

Sun 2/1

12:03 pm-12:08 am

1 stop14h 05m

$178

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

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

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 St. Louis?

In general, September is the cheapest month to fly from San Diego to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $271. The month of February is another great option to travel to St. Louis, with average flight prices from San Diego averaging around $312.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $429. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $572. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from San Diego at noon is the least expensive time of day to depart. momondo users have found prices as low as $463 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $485 per ticket.

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

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

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

You are more likely to see cheaper flights to St. Louis from San Diego when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $384 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from San Diego for as low as $306 on momondo.

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

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

Can stopping save me money on San Diego to St. Louis flights?

You could potentially save up to 60% on your flight if you consider stops on a San Diego to St. Louis flight.

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

As of January 2026, prices for San Diego to St. Louis flights are approximately 31% cheaper when compared to flights at the same time last year.

When to book flights from San Diego to St. Louis

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

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

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

Best Price Found

$218

Fastest flight time

3h 30m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from San Diego in the past 72 hours is $218. The best round-trip flight deal from San Diego to St. Louis found on momondo in the last 72 hours is $463.
The fastest flight from San Diego to St. Louis takes 3h 30m
Direct flights go from San Diego to St. Louis every day.
There is 1 airport in St. Louis. From San Diego there are direct flights to Lambert-St Louis (STL).
Search flight deals

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

    Lambert-St Louis is 1560.0 mi away from San Diego. 3h 30m is a normal flight duration for this route.

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

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

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

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

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis 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 Lambert-St Louis 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 San Diego to St. Louis?

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

Best airlines flying from San Diego to St. Louis

Compare and see reviews for airlines that fly from San Diego to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $137Free CancellationRating
5.7
3,062 reviews
Search Frontier flights
DeltaPriceFrom $184Free CancellationRating
7.9
8,025 reviews
Search Delta flights
American AirlinesPriceFrom $249Free CancellationRating
7.2
11,095 reviews
Search American Airlines flights
United AirlinesPriceFrom $256Free CancellationRating
7.4
9,139 reviews
Search United Airlines flights
SouthwestPriceFrom $306Free CancellationRating
8.0
4,250 reviews
Search Southwest flights

  • Southwest Flights From San Diego to St. Louis

    Southwest is one of the most popular airlines flying from San Diego to St. Louis, operating 5 flights/week on average for this route. A good Southwest flight deal for San Diego to St. Louis starts from $306 round-trip, up to an average price of $479. Our users have rated Southwest at 8.0/10.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
O'Fallon
Maryland Heights
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Festus
Edwardsville
Glencoe
Litchfield
Shrewsbury

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from San Diego to St. Louis. momondo saves you time and could save you money on your trip.

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

Flights from San Diego to St. Louis 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 San Diego to St. Louis?

Once all potential San Diego to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are not ready to book a flight from San Diego to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.

An easier way to manage your St. Louis 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.
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