Cheap flights from Colorado to San Antonio from $39

If you aren’t able to travel during the month of September, then book flights to San Antonio from Colorado during January instead. Flights to San Antonio in January, while not as cheap as those in September, still average around $197.

The cheapest day to depart on your flight to San Antonio is on a Friday when prices can be found for as low as $200. 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 Monday as prices are generally higher than usual. According to our data, the average ticket price to San Antonio on Monday is $271.

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 Colorado to San Antonio in the afternoon for as low as $195. 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 morning, with an average ticket price of $240. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

Fly from Denver Intl to San Antonio for the best Colorado - San Antonio flight prices

You are more likely to see cheaper flights to San Antonio from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to San Antonio for around $215 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Antonio from Colorado for as low as $156 on momondo.

There are 4 cabin classes available to choose from on Colorado to San Antonio flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Southwest, Delta, and United Airlines are the most popular carriers operating from Colorado to San Antonio

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to San Antonio from Colorado according to our data. Frontier is the first choice among our users, with 43% 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.

As of March 2026, 12 flights take off from Colorado and land in San Antonio each day. The most common flight departure time for this route is 1:00PM, with 37% of daily flights taking off in the afternoon.

As of March 2026, there are 88 flights per week flying from Colorado to San Antonio. The most common day of the week flights depart is Thu, with 23% of flights taking off on this day.