$79 Cheap Flights from Denver (DEN) to San Antonio (SAT)

View $79 flight on Sat, Aug 16, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to San Antonio International Airport (SAT)

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Cheap Flights from Denver to San Antonio (DEN-SAT)

Prices were available within the past 7 days and start at $79 for one-way flights and $119 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Sat, Oct 25 - Sat, Nov 1
DEN
Denver
SAT
San Antonio
$119 Roundtrip, found 1 hour ago
$119
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sat, Oct 25 from Denver to San Antonio, returning Sat, Nov 1, priced at $119 found 1 hour ago
Frontier Airlines
Sun, Sep 14 - Sat, Sep 20
DEN
Denver
SAT
San Antonio
$129 Roundtrip, found 1 hour ago
$129
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Sun, Sep 14 from Denver to San Antonio, returning Sat, Sep 20, priced at $129 found 1 hour ago
Frontier Airlines
Thu, Aug 28 - Mon, Sep 1
DEN
Denver
SAT
San Antonio
$139 Roundtrip, just found
$139
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Aug 28 from Denver to San Antonio, returning Mon, Sep 1, priced at $139 just found
Frontier Airlines
Sat, Aug 16 - Sat, Aug 23
DEN
Denver
SAT
San Antonio
$152 Roundtrip, just found
$152
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 16 from Denver to San Antonio, returning Sat, Aug 23, priced at $152 just found
Frontier Airlines
Sun, Sep 7 - Sat, Sep 13
DEN
Denver
SAT
San Antonio
$154 Roundtrip, found 2 hours ago
$154
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Sun, Sep 7 from Denver to San Antonio, returning Sat, Sep 13, priced at $154 found 2 hours ago
United
Sat, Sep 27 - Sat, Oct 4
DEN
Denver
SAT
San Antonio
$157 Roundtrip, found 1 hour ago
$157
Roundtrip
found 1 hour ago
Select United flight, departing Sat, Sep 27 from Denver to San Antonio, returning Sat, Oct 4, priced at $157 found 1 hour ago
Frontier Airlines
Sat, Aug 9 - Tue, Aug 12
DEN
Denver
SAT
San Antonio
$160 Roundtrip, just found
$160
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, Aug 9 from Denver to San Antonio, returning Tue, Aug 12, priced at $160 just found
Southwest Airlines
Sat, Aug 23 - Mon, Aug 25
DEN
Denver
SAT
San Antonio
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Southwest Airlines flight, departing Sat, Aug 23 from Denver to San Antonio, returning Mon, Aug 25, priced at $177 just found
Delta
Sat, Oct 11 - Sat, Oct 18
DEN
Denver
SAT
San Antonio
$182 Roundtrip, found 1 hour ago
$182
Roundtrip
found 1 hour ago
Select Delta flight, departing Sat, Oct 11 from Denver to San Antonio, returning Sat, Oct 18, priced at $182 found 1 hour ago
American Airlines
Sat, Nov 1 - Sat, Nov 8
DEN
Denver
SAT
San Antonio
$187 Roundtrip, found 1 day ago
$187
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Nov 1 from Denver to San Antonio, returning Sat, Nov 8, priced at $187 found 1 day ago

Find the cheapest month to fly from Denver (DEN) to San Antonio (SAT)

September is typically the cheapest month to fly

From $48 - $157 per traveler.

Graph displaying average flight prices per month

Flights from Denver (DEN) to San Antonio (SAT)
Origin airport
Denver Intl.
Destination airport
San Antonio Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$113
Distance
794 mi
Average flight time
3 hours 10 mins

Denver to San Antonio Flights

The cheapest times to fly from Denver to San Antonio

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Denver to San Antonio are during the month of October. You can find some of the cheapest flights from Denver to San Antonio with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Denver to San Antonio

Sunday is one of the best days to book for cheap flights from Denver to San Antonio: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Denver to San Antonio

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Denver to San Antonio in 2025. You can also book with separate airlines for your outbound and return journeys, from $79 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Denver to San Antonio flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Denver to San Antonio airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT) cost?
Snag cheap return fares starting from $88 from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Frontier Airlines flight leaving DEN on August 9 2025 and touching down at SAT. The price was last updated on July 13 2025 and has not changed since.
What is the cheapest month to fly from DEN to SAT?
The cheapest flights from DEN to SAT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT)?
Skip the layovers and fly direct from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT) with 3 carriers, including:

  • Southwest Airlines
  • United Airlines
  • Frontier Airlines

What is the cheapest airline that flies from DEN to SAT?
Travel from DEN to SAT with Southwest Airlines. This airline currently offers the lowest one-way fare for this route, starting at $66. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from DEN on October 4 2025. Prices were last updated on July 13 2025 and have not changed since.
How many flights per day from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT)?
With an average of 7 direct flights departing from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT) every day, you'll be off on your next adventure in no time.
What are the most popular departure times for flights from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT)?
Flights between DEN and SAT are their busiest at 10 AM. If you want a more relaxed trip and possibly cheaper fares, look for a departure outside the usual busy windows.
What day of the week has the most flights from DEN to SAT?
Sunday has the most flights from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT). Consider jetting off on this day and you'll have the best chance of finding a departure that fits your schedule.
What is the earliest flight from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT)?
Take the earliest flight at around 8:25AM UTC-7, departing from Denver Intl. Airport (DEN). You'll be traveling for approximately 2h 15m, arriving at San Antonio Intl. Airport (SAT) at approximately 11:40AM UTC-6.
How long does it take to fly from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT)?
It takes about 2 hours and 13 minutes to cover the 800 mi from DEN to SAT.
What is the best time to fly from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT)?
To avoid potential delays on the Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT) route, aim to fly before 3 PM. Later departures have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for San Antonio from Denver Intl. Airport (DEN)?
If you're flying on a direct flight from Denver Intl. Airport (DEN) to San Antonio, San Antonio Intl. Airport (SAT) is the only airport you can touch down at.
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT) last-minute?
Holding off until just before your trip to book a flight from DEN to SAT generally means paying more. While you may come across some last-minute offers, they're not always guaranteed. Keep your travel plans flexible for the best chance of landing a bargain.
Is it cheaper to book a DEN to SAT flight and hotel package?
Booking a DEN to SAT flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our extensive range of accommodations and then add activities, car rentals and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT)?
If you booked your DEN to SAT flight within the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more information.

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*Available to One Key members.