Cheap flights from St. Louis to San Diego from $94
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 10/3. 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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Fly from
Fly to
Route
Depart
Return
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Mon 8/31
7:58 pm-9:05 am
1 stop15h 07m
San Diego
Tue 9/8
3:45 pm-7:17 pm
1 stop25h 32m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Wed 9/16
8:10 pm-3:59 pm
1 stop21h 49m
San Diego
Sat 9/19
9:03 am-9:35 am
1 stop22h 32m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Mon 9/14
8:10 pm-11:51 pm
1 stop5h 41m
San Diego
Wed 9/16
6:55 am-5:10 pm
1 stop8h 15m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Sun 10/18
7:02 am-1:23 pm
1 stop8h 21m
San Diego
Sat 10/24
6:25 am-7:15 pm
1 stop10h 50m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Fri 8/28
8:42 am-1:44 pm
1 stop7h 02m
San Diego
Sun 8/30
6:18 am-3:38 pm
1 stop7h 20m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Thu 10/29
8:00 am-1:47 pm
1 stop7h 47m
San Diego
Tue 11/10
12:39 pm-8:59 pm
1 stop6h 20m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Fri 9/18
11:01 am-5:29 pm
1 stop8h 28m
San Diego
Fri 9/25
10:46 pm-10:18 am
1 stop9h 32m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Wed 8/26
5:42 am-11:57 am
1 stop8h 15m
San Diego
Tue 9/8
1:11 pm-12:14 am
1 stop9h 03m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Tue 9/1
11:00 am-5:05 pm
1 stop8h 05m
San Diego
Mon 9/14
3:20 pm-11:16 pm
1 stop5h 56m
St. LouisSan Diego
STL Lambert-St Louis - SAN San Diego
STLSAN
Lambert-St Louis
Wed 9/2
6:00 am-11:07 am
1 stop7h 07m
San Diego
Mon 9/14
3:20 pm-11:16 pm
1 stop5h 56m
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 typical price of a round-trip flight between St. Louis and San Diego?
Prices are currently low for flights on this route.
Typical prices usually range from $306 to $482.The lowest price recently found on this route was $258.
What is the cheapest month to fly to San Diego?
If you are unable to visit San Diego during the month of September, then departing from St. Louis during the month October is also very affordable. Most momondo users find prices during this month for around $371.
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 Wednesday. Travelers who choose to depart for San Diego on a Wednesday will often find tickets for as low as $427. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around $554. 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 $414. Flights at noon are often more expensive with an average ticket price of $626.
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 from St. Louis 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 $399 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 $327 on momondo.
What cabin class options are available on St. Louis to San Diego flights?
There is only 1 cabin class available to choose from on 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.
What is the cheapest airline that flies from Lambert-St Louis to San Diego?
United Airlines and Delta are the most popular carriers operating from Lambert-St Louis to San Diego
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 53% 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.
Which airport is the most popular layover for flights between St. Louis and San Diego?
Denver (DEN) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from St. Louis to San Diego?
Flights via Denver (DEN) offer the lowest average round-trip price of $282.
Which layover airport has the shortest travel time from St. Louis to San Diego?
Flights connecting via Denver (DEN) have the shortest average one-way travel time: 6h 04m.
Which layover airport has the shortest connection time from St. Louis to San Diego?
Salt Lake City (SLC) has the shortest average layover time for this route: 0h 48m.
How many flights depart from St. Louis to San Diego on average per day?
As of August 2026, 1 flights take off from St. Louis and land in San Diego each day. The most common flight departure time for this route is 8:00AM, with 50% of daily flights taking off at noon.
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 8 per week as of August 2026. The most frequent departure day is Mon, with 25% 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
Frequently asked questions about flying from St. Louis to San Diego
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 August 2026.
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 737-800 Passenger/BBJ2 (winglets) (49.33% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (25.33%), Boeing 737 (6.67%), and Boeing 737-800 (4.00%).
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 52% of the total bookings. Other popular airlines include American Airlines with 17%, Frontier with 12%, and Delta with 10%.
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 | ||
|---|---|---|---|---|---|
| PriceFrom $145 | Free Cancellation | Rating 5.6 2,718 reviews | |||
| PriceFrom $182 | Free Cancellation | Rating 7.4 10,090 reviews | |||
| PriceFrom $222 | Free Cancellation | Rating 7.8 8,504 reviews | |||
| PriceFrom $226 | Free Cancellation | Rating 7.1 11,899 reviews | |||
| PriceFrom $289 | Free Cancellation | Rating 8.0 4,216 reviews |
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 $289. Generally, Southwest has 8 flights on this route every week with an average price of $455. Southwest is rated 8.0/10 by our users.
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsWhy 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.