$99 Cheap United flights Denver (DEN) to San Antonio (SAT)

Landing cheap one-way United Airlines flights from DEN to SAT from $99 on Expedia is simple — just filter by “Price (lowest to highest).” Alternatively, check out our budget-friendly return fares from $159 for your next exciting adventure.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

United Airlines flights to San Antonio are typically more affordable in the quieter months of January and September. Whether you need a one-way or round-trip ticket, you could score a better deal then.

Begin your search one to three months before your departure to score cheaper fares on United Airlines flights from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also cut costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Get your timing right, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

You can easily fly from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT) on one of United Airlines’s 21 weekly direct flights. Use our “Nonstop” and “Airline” filters to find the United Airlines flight that’ll take you to SAT at a time that suits you.

Leave Denver Intl. Airport (DEN) for San Antonio Intl. Airport (SAT) on a direct United Airlines flight, and you’ll be in the skies for about 2h 14m.

If you’re looking for flexibility, Saturday offers the most choice for United Airlines flights from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT). You can select from 3 different departures.

The first United Airlines flight from DEN to SAT departs at 10:05AM UTC-7, touching down at 1:21PM UTC-6. If you want to head off later in the day, the last United Airlines flight leaves DEN at 5:49PM UTC-7 and lands at SAT at 9:03PM UTC-6. Flying earlier is generally a smart option as morning flights tend to experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

San Antonio Intl. Airport (SAT) is the main San Antonio gateway for United Airlines flights from Denver Intl. Airport (DEN).

A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to depart from DEN to SAT with United Airlines. Plus, when you join Expedia’s free One Key™ program, you can earn OneKeyCash™* in addition to United Airlines’s loyalty program earnings. It’s yours to use wherever your next trip takes you.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

United Airlines typically uses Boeing 737-800 planes for flights from Denver Intl. Airport (DEN) to San Antonio Intl. Airport (SAT). This airline also operates the Airbus A319 on this route. Bear in mind that aircraft type can vary depending on operational demands, so the plane you catch could be different on your travel date.

Depending on your fare type, a fee may apply if you change or cancel your flight more than 24 hours after it has been confirmed. To find flexible fares, select our “No cancel fee” or “Changes included” filter when looking for flights. For more details on canceling or modifying your reservation, head to “Trips,” select your flight and tick “Manage Booking.”