Question 1

What is the cheapest Denver Intl to Lambert-St Louis flight route?

Accepted Answer

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

Question 2

How many flights depart from Denver to St. Louis on average per day?

Accepted Answer

14 flights are operational daily from Denver to St. Louis as of August 2025. The most popular departure time for this route is 1:00PM, with 37% of flights per day taking off at noon.

Question 3

What is the cheapest month to fly to St. Louis?

Accepted Answer

In general, January is the cheapest month to fly from Denver to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $168. The month of February is another great option to travel to St. Louis, with average flight prices from Denver averaging around $186.

Question 4

What is the cheapest day to depart on your flight to St. Louis?

Accepted Answer

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $230. 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 Sunday because tickets tend to average around $346. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

Question 5

How have Denver to St. Louis flight prices changed over time?

Accepted Answer

As of August 2025, prices for Denver to St. Louis flights are approximately 14% more expensive when compared to flights at the same time last year.

Question 6

How far in advance should I book a flight to St. Louis?

Accepted Answer

You are more likely to see cheaper flights to St. Louis from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $224 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Denver for as low as $168 on momondo.

Question 7

What airlines fly to St. Louis?

Accepted Answer

Frontier, Southwest and United Airlines are the top three most popular airlines that fly to St. Louis from Denver according to our data. Frontier 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 4 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

Question 8

What is the cheapest time of day to depart on your flight to St. Louis?

Accepted Answer

Flying to St. Louis from Denver in the evening is the least expensive time of day to depart. momondo users have found prices as low as $205 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 $306 per ticket.

Question 9

What is the cheapest airline that flies from Denver Intl to Lambert-St Louis?

Accepted Answer

Frontier, American Airlines, and Delta are the most popular carriers operating from Denver Intl to Lambert-St Louis

Question 10

What cabin class options are available on Denver Intl to Lambert-St Louis flights?

Accepted Answer

There are 4 cabin classes available to choose from on Denver Intl 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.

Question 11

How many flights depart from Denver to St. Louis on average per week?

Accepted Answer

100 flights are operational weekly from Denver to St. Louis as of August 2025. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.

Question 12

Which airlines fly direct from Denver to St. Louis?

Accepted Answer

When travelers are planning on making the trip from Denver International Airport (DEN) to Lambert St. Louis International Airport (STL) for flights from Denver to St. Louis, the choices for airlines that offer direct flights include Frontier Airlines, United Airlines, and Southwest Airlines. Each of these airlines offers nonstop service between these two airports and the cities they serve.

Question 13

What are the benefits of the different airports in Denver and St. Louis?

Accepted Answer

For those that wish to drive themselves to the Denver International Airport before flights from Denver to St. Louis, the Denver International Airport not only offers a host of different parking options but also offers the ability to charge up to 36 electric vehicles in their lots and garages. There are also 27 spaces dedicated to hybrid vehicles. If you are a mother that is nursing while you are traveling from Denver to St. Louis, the Denver International Airport has three different nursing rooms offering comfortable seating, power outlets, sinks, changing tables, and they are wheelchair accessible. If you have brought children along on your trip between Denver and St. Louis, the Lambert-St. Louis International Airport has something called the Children's Play Port, which is a transportation-themed educational play exhibit that features an air traffic control tower, a Metrolink light rail train, and an airplane, all perfectly sized for kids. If you have brought a service animal with you on your trip from Denver to St. Louis and they are in need of a stop after a long flight, you'll be happy to know that there are six pet relief areas outside the terminal buildings and in each concourse of the airport in St. Louis.

Question 14

What is the best way to get in and out of airports in Denver and St. Louis?

Accepted Answer

For fliers that are planning to travel from downtown Denver to the Denver International Airport before flights from Denver to St. Louis, there are several ground transportation choices. One cost-effective option is to ride on the Regional Transport District light-rail route A that offers service from Union Station in downtown Denver to the Denver International Airport. Another option before Denver to St. Louis flights is to ride on city buses 83L or 83D from the Civic Center Station in downtown to the Nine Mile Station and then take the AT line bus to the airport. For travelers who prefer to go to the airport by car, there are plenty of taxi and rideshare options available to get you from downtown to the airport. Once you have arrived at the Lambert-St. Louis International Airport, a good choice for ground transportation to get you to the center of St. Louis is aboard the Greyhound bus that offers direct service from the airport to downtown. Another choice for those arriving on flights from Denver to St. Louis is on the Metro St. Louis MLR train route that operates between the Lambert Main Terminal Metrolink Station and Union Station in downtown St. Louis. Beyond these choices, travelers can also take a taxi or a rideshare vehicle after cheap flights from Denver to St. Louis. There are plenty of large rental car chains available at the airport if you prefer to drive downtown.

Which cities can you get to from St. Louis?

The airport in St. Louis not only makes a great destination for people traveling to the city center, but it is also a good airport for those traveling to communities that surround St. Louis, including Chesterfield, Washington, Bloomsdale, Collinsville, Edwardsville, Belleville, Alton, Saint Charles, Jerseyville, Winfield, New Haven, and O'Fallon.

Question 15

When did momondo last update prices for flights from Denver Intl Airport to Lambert-St Louis Airport?

Accepted Answer

Prices for flights from Denver Intl Airport to Lambert-St Louis Airport were last updated today.

Question 16

How many operators does momondo search for flights from Denver Intl Airport to Lambert-St Louis Airport?

Accepted Answer

As of August 2025, there are 3 operators available to choose from for flights from Denver Intl Airport to Lambert-St Louis Airport.

Question 17

How old do you have to be to fly from Denver Intl Airport to Lambert-St Louis Airport?

Accepted Answer

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Lambert-St Louis Airport.

Question 18

What documentation or ID do you need to fly to Lambert-St Louis Airport?

Accepted Answer

The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best Price Found	$113
Fastest flight time	1h 56m
Direct flights	Every day
Airports in St. Louis	1 airport

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $55	Free Cancellation	Rating 5.8 3,207 reviews	Search Frontier flights
United Airlines	PriceFrom $154	Free Cancellation	Rating 7.4 8,930 reviews	Search United Airlines flights
Southwest	PriceFrom $174	Free Cancellation	Rating 8.0 4,245 reviews	Search Southwest flights

Cheap flights from Denver to St. Louis from $75

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What is the cheapest month to fly to St. Louis?

What is the cheapest day to depart on your flight to St. Louis?

What is the cheapest time of day to depart on your flight to St. Louis?

What is the cheapest Denver Intl to Lambert-St Louis flight route?

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

How far in advance should I book a flight to St. Louis?

What cabin class options are available on Denver Intl to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on Denver Intl 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.

How have Denver to St. Louis flight prices changed over time?

As of August 2025, prices for Denver to St. Louis flights are approximately 14% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Denver Intl to Lambert-St Louis?

Frontier, American Airlines, and Delta are the most popular carriers operating from Denver Intl to Lambert-St Louis

What airlines fly to St. Louis?

How many flights depart from Denver to St. Louis on average per day?

14 flights are operational daily from Denver to St. Louis as of August 2025. The most popular departure time for this route is 1:00PM, with 37% of flights per day taking off at noon.

How many flights depart from Denver to St. Louis on average per week?

100 flights are operational weekly from Denver to St. Louis as of August 2025. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.

When to book flights from Denver to St. Louis

Cheap Denver to St. Louis (DEN to STL) flight deals and tips

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How far is Denver Intl to Lambert-St Louis by plane?

When did momondo last update prices for flights from Denver Intl Airport to Lambert-St Louis Airport?

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How old do you have to be to fly from Denver Intl Airport to Lambert-St Louis Airport?

What documentation or ID do you need to fly to Lambert-St Louis Airport?

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What is the most popular airline from Denver to St. Louis?

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