Cheap flights from St. Louis to San Antonio from $99
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 Antonio departing on 8/4. 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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American Airlines flights from St. Louis to San Antonio
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How to get the cheapest flight ticket from St. Louis to San Antonio
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 Antonio?
If you aren’t able to travel during the month of April, then book flights to San Antonio from St. Louis during August instead. Flights to San Antonio in August, while not as cheap as those in April, still average around $298.
What is the cheapest day to depart on your flight to San Antonio?
The cheapest day to depart on your flight to San Antonio is on a Tuesday when prices can be found for as low as $370. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Sunday is $461.
What is the cheapest time of day to depart on your flight to San Antonio?
According to our data, the cheapest time of day to fly to San Antonio is in the afternoon. momondo users have found flights departing from St. Louis to San Antonio in the afternoon for as low as $370. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to San Antonio are more costly in the evening, with an average ticket price of $438. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.
What is the cheapest Lambert-St Louis to San Antonio flight route?
Fly from Lambert-St Louis to San Antonio for the best Lambert-St Louis - San Antonio flight prices
How far in advance should I book a flight to San Antonio?
You are more likely to see cheaper flights to San Antonio from St. Louis when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $329 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from St. Louis for as low as $268 on momondo.
What cabin class options are available on Lambert-St Louis to San Antonio flights?
There are 1 cabin classes available to choose from on Lambert-St Louis to San Antonio 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 St. Louis to San Antonio flights?
No. A direct flight is the cheapest option for a flight between St. Louis to San Antonio.
How have St. Louis to San Antonio flight prices changed over time?
As of June 2025, prices for St. Louis to San Antonio flights are approximately 24% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Lambert-St Louis to San Antonio?
Southwest, American Airlines, and United Airlines are the most popular carriers operating from Lambert-St Louis to San Antonio
What airlines fly to San Antonio?
Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to San Antonio from St. Louis according to our data. Southwest is the first choice among our users, with 52% of people opting to fly with this airline when traveling to San Antonio. Keep in mind that there are 5 different airlines that fly to San Antonio on a routine basis, so you have a few additional options to choose from.
How many flights depart from St. Louis to San Antonio on average per day?
As of June 2025, 2 flights take off from St. Louis and land in San Antonio each day. The most common flight departure time for this route is 9:00AM, with 37% of daily flights taking off at noon.
How many flights depart from St. Louis to San Antonio on average per week?
The number of flights available between St. Louis and San Antonio is 14 per week as of June 2025. The most frequent departure day is Tue, with 29% of weekly flights leaving on this day.
When to book flights from St. Louis to San Antonio
Cheap St. Louis to San Antonio (STL to SAT) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to San Antonio
How far is Lambert-St Louis to San Antonio by plane?
There are 792.4 mi between Lambert-St Louis and San Antonio. 2h 05m is a normal flight duration for this route.
When did momondo last update prices for flights from Lambert-St Louis Airport to San Antonio Airport?
Prices for flights from Lambert-St Louis Airport to San Antonio Airport are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to San Antonio Airport?
The number of operators available for flights from Lambert-St Louis Airport to San Antonio Airport is 5 as of June 2025.
How old do you have to be to fly from Lambert-St Louis Airport to San Antonio 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 Antonio Airport.
What documentation or ID do you need to fly to San Antonio Airport?
The travel and health documents you'll need for your trip to San Antonio 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 Antonio 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 Antonio?
momondo data reveals that the most frequently booked plane model on the route from St. Louis to San Antonio is Boeing 737-700 Passenger/BBJ1 (winglets), representing 35.37% of all bookings. The subsequent popular models are Boeing 737-800 Passenger/BBJ2 (winglets) at 35.37%, Boeing 737 MAX 8 at 19.73%, and Airbus A319 at 2.72%.
What is the most popular airline from St. Louis to San Antonio?
Based on momondo bookings for flights between St. Louis and San Antonio, the leading airline is Southwest, making up 38% of the total bookings. Other popular airlines include American Airlines with 29%, United Airlines with 20%, and Frontier with 7%.
Best airlines flying from St. Louis to San Antonio
Compare and see reviews for airlines that fly from St. Louis to San Antonio with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $124 | Free Cancellation | Rating 8.0 7,950 reviews | |||
| PriceFrom $128 | Free Cancellation | Rating 5.9 3,295 reviews | |||
| PriceFrom $198 | Free Cancellation | Rating 8.0 4,287 reviews | |||
| PriceFrom $200 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $218 | Free Cancellation | Rating 7.4 8,790 reviews |
Southwest Flights From St. Louis to San Antonio
The lowest priced Southwest flight from St. Louis to San Antonio from the last 72 hours was $198. Generally, Southwest has 14 flights on this route every week with an average price of $396. Southwest is rated 8.0/10 by our users.
Traveling to a place near San Antonio?
Book flights to San Antonio 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 Antonio?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to San Antonio from St. Louis.
Can I find flights from St. Louis to San Antonio with flexible booking policies on momondo?
Flights from St. Louis to San Antonio 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 Antonio?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to San Antonio from St. Louis.
I’m not ready to book a flight from St. Louis to San Antonio right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of St. Louis to San Antonio flights. All you need is a valid email address and we will do the rest; it is that quick and easy.