Cheap flights from San Antonio to St. Louis from $91
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 Antonio to St. Louis departing on 8/15. 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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United Airlines flights from San Antonio to St. Louis
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How to get the cheapest flight ticket from San Antonio 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, February is the cheapest month to fly from San Antonio to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $298. The month of August is another great option to travel to St. Louis, with average flight prices from San Antonio averaging around $298.
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 $379. 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 $506. 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 Antonio in the evening is the least expensive time of day to depart. momondo users have found prices as low as $201 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 $557 per ticket.
What is the cheapest San Antonio to Lambert-St Louis flight route?
Fly from San Antonio to Lambert-St Louis for the best San Antonio - 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 Antonio when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $340 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 Antonio for as low as $196 on momondo.
What cabin class options are available on San Antonio to Lambert-St Louis flights?
There are 1 cabin classes available to choose from on San Antonio 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 Antonio to Lambert-St Louis?
Frontier, Southwest, and American Airlines are the most popular carriers operating from San Antonio to Lambert-St Louis
What airlines fly to St. Louis?
Southwest, American Airlines and United Airlines are the top three most popular airlines that fly to St. Louis from San Antonio according to our data. Southwest is the first choice among our users, with 46% 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 Antonio to St. Louis on average per day?
The number of flights available between San Antonio and St. Louis is 1 per day as of July 2025. The most frequent departure time is 7:00AM, with 50% of daily flights leaving at noon.
How many flights depart from San Antonio to St. Louis on average per week?
The number of flights available between San Antonio and St. Louis is 10 per week as of July 2025. The most frequent departure day is Tue, with 30% of weekly flights leaving on this day.
When to book flights from San Antonio to St. Louis
Cheap San Antonio to St. Louis (SAT to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from San Antonio to St. Louis
Best Price Found | $91 |
|---|---|
Fastest flight time | 2h 05m |
Direct flights | Mon, Wed, Thu, Fri, Sat and Sun |
Airports in St. Louis | 1 airport |
How far is San Antonio to Lambert-St Louis by plane?
San Antonio and Lambert-St Louis are 792.4 mi apart from one another. By plane, this route typically takes 2h 05m.
When did momondo last update prices for flights from San Antonio Airport to Lambert-St Louis Airport?
Prices for flights from San Antonio Airport to Lambert-St Louis Airport were last updated today.
How many operators does momondo search for flights from San Antonio Airport to Lambert-St Louis Airport?
As of July 2025, there are 5 operators available to choose from for flights from San Antonio Airport to Lambert-St Louis Airport.
How old do you have to be to fly from San Antonio Airport to Lambert-St Louis Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from San Antonio Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from San Antonio to St. Louis?
Based on momondo bookings for flights between San Antonio and St. Louis, the leading plane model is Boeing 737-800 Passenger/BBJ2 (winglets), making up 15.04% of the total bookings. Other popular models include Boeing 737 MAX 8 with 13.27%, Boeing 737-700 Passenger/BBJ1 (winglets) with 11.50%, and Airbus A321-100/200 with 7.08%.
What is the most popular airline from San Antonio to St. Louis?
Based on momondo bookings for this flight route, the most popular airline on flight routes from San Antonio to St. Louis is American Airlines (39% of total bookings). The next most popular airlines are Southwest (25%), United Airlines (18%), and Delta (12%).
Best airlines flying from San Antonio to St. Louis
Compare and see reviews for airlines that fly from San Antonio to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $128 | Free Cancellation | Rating 5.9 3,286 reviews | |||
| PriceFrom $134 | Free Cancellation | Rating 8.0 7,982 reviews | |||
| PriceFrom $196 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $238 | Free Cancellation | Rating 8.0 4,266 reviews | |||
| PriceFrom $248 | Free Cancellation | Rating 7.4 8,861 reviews |
Southwest Flights From San Antonio to St. Louis
Southwest flies from San Antonio to St. Louis around 10 times per week, with 4,266 momondo users rating the airline 8.0/10. The cheapest Southwest deal from San Antonio to St. Louis in the last 72 hours was $238 (round-trip), much lower than the average airfare cost of $414 for Southwest flights on this route.
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 Antonio to St. Louis?
It is quick and easy to find San Antonio to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.
Can I find flights from San Antonio to St. Louis with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to St. Louis from San Antonio with this policy.
How can momondo help me find flights from San Antonio to St. Louis?
Once all potential San Antonio 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 Antonio to St. Louis right now. Can momondo alert me if prices change?
Yes. momondo can track prices for San Antonio to St. Louis flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.