Cheap flights from St. Louis to Colorado from $37

The month of January is, on average, the cheapest month to fly to Colorado from St. Louis, with most prices found around $240. The month of February is another great option to travel to Colorado, with average flight prices from St. Louis averaging around $269.

The cheapest day to depart from St. Louis to Colorado is on a Saturday when prices can be found for as low as $355. On the other hand, Sunday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $487.

The cheapest time of day to fly to Colorado is in the evening when flights can be purchased for as low as $253. In the morning is when there is more demand to fly to Colorado, so prices are often more expensive at around $460 per ticket.

Fly from Lambert-St Louis to Denver Intl for the best Lambert-St Louis - Colorado flight prices

You are more likely to see cheaper flights to Colorado from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Colorado for around $281 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Colorado from St. Louis for as low as $242 on momondo.

There are 4 cabin classes available to choose from on St. Louis to Colorado 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 Lambert-St Louis to Colorado

Frontier, United Airlines and Southwest are the top three most popular airlines that fly to Colorado from St. Louis according to our data. Frontier is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Colorado. Keep in mind that there are 4 different airlines that fly to Colorado on a routine basis, so you have a few additional options to choose from.

10 flights are operational daily from St. Louis to Colorado as of November 2026. The most popular departure time for this route is 8:00AM, with 49% of flights per day taking off in the afternoon.

The number of flights available between St. Louis and Colorado is 71 per week as of November 2026. The most frequent departure day is Fri, with 20% of weekly flights leaving on this day.