Cheap flights from San Diego to St. Louis from $88
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 10/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from San Diego to St. Louis
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Frontier flights from San Diego to St. Louis
Our best Frontier deals on San Diego to St. Louis flight tickets
Southwest flights from San Diego to St. Louis
Our best Southwest deals on San Diego to St. Louis flight tickets
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, August 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 $295. 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 Wednesday when prices can be found for as low as $454. 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 Sunday because tickets tend to average around $532. 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 in the evening is the least expensive time of day to depart. momondo users have found prices as low as $198 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $501 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 $372 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 $275 on momondo.
What cabin class options are available on San Diego to Lambert-St Louis flights?
There are 1 cabin classes 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.
What is the cheapest airline that flies from San Diego to Lambert-St Louis?
Southwest, Spirit Airlines, and Alaska Airlines are the most popular carriers operating from San Diego to Lambert-St Louis
What airlines fly to St. Louis?
Southwest, American Airlines and Frontier are the top three most popular airlines that fly to St. Louis from San Diego according to our data. Southwest is the first choice among our users, with 33% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from San Diego to St. Louis on average per day?
The number of flights available between San Diego and St. Louis is 1 per day as of July 2025. The most frequent departure time is 6:00AM, with 60% of daily flights leaving at noon.
How many flights depart from San Diego to St. Louis on average per week?
As of July 2025, there are 10 flights per week flying from San Diego to St. Louis. The most common day of the week flights depart is Mon, with 20% of flights taking off on this day.
When to book flights from San Diego to St. Louis
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
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?
There are 5 operators available for flights from San Diego Airport to Lambert-St Louis Airport as of July 2025.
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?
Based on momondo bookings for flights between San Diego and St. Louis, the leading plane model is Boeing 737-700 Passenger/BBJ1 (winglets), making up 40.16% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 13.39%, Boeing 737 MAX 9 with 8.66%, and Boeing 737 with 7.87%.
What is the most popular airline from San Diego to St. Louis?
Based on momondo bookings for flights between San Diego and St. Louis, the leading airline is Southwest, making up 31% of the total bookings. Other popular airlines include American Airlines with 21%, Delta with 17%, and Frontier with 16%.
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 | ||
|---|---|---|---|---|---|
| PriceFrom $113 | Free Cancellation | Rating 5.9 3,271 reviews | |||
| PriceFrom $184 | Free Cancellation | Rating 8.0 7,954 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $256 | Free Cancellation | Rating 7.4 8,842 reviews | |||
| PriceFrom $343 | Free Cancellation | Rating 8.0 4,252 reviews |
Southwest Flights From San Diego to St. Louis
Southwest is one of the most popular airlines flying from San Diego to St. Louis, operating 10 flights/week on average for this route. A good Southwest flight deal for San Diego to St. Louis starts from $343 round-trip, up to an average price of $487. 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 locationsWhy 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.