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

7 flights are operational daily from Denver to St. Louis as of November 2025. The most popular departure time for this route is 9:00AM, with 48% of flights per day taking off at noon.

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

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

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

50 flights are operational weekly from Denver to St. Louis as of November 2025. The most popular departure day for this route is Thu, with 24% of flights per week taking off on this day.

What airlines fly to St. Louis?

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 48% 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.

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

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.

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

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.

Which airlines fly direct from Denver to St. Louis?

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.

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

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

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

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

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

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.

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

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.

$24 Cheap Flights from Denver to St. Louis in 2025/26

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7:05 am - 10:14 amDEN-STL

2h 09mnonstop

1:16 pm - 3:58 amSTL-DEN

15h 42m1 stop

$104Frontier

Find Deal

Fri, Dec 12 - Mon, Dec 15

6:50 am - 10:02 amDEN-STL

2h 12mnonstop

5:11 pm - 11:23 amSTL-DEN

19h 12m1 stop

$108Frontier

Find Deal

Wed, Jan 7 - Tue, Jan 13

8:00 am - 12:12 pmDEN-STL

27h 12m1 stop

8:21 pm - 2:25 pmSTL-DEN

19h 04m1 stop

$110Frontier

Find Deal

Thu, Jan 8 - Mon, Jan 12

3:38 pm - 6:44 pmDEN-STL

2h 06mnonstop

1:03 pm - 11:52 pmSTL-DEN

11h 49m1 stop

$111Frontier

Find Deal

Fri, Jan 30 - Sun, Feb 1

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

12:07 pm - 12:20 amSTL-DEN

13h 13m1 stop

$112Frontier

Find Deal

Fri, Dec 5 - Mon, Dec 8

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

10:10 pm - 3:58 amSTL-DEN

6h 48m1 stop

$113Frontier

Find Deal

Wed, Dec 17 - Sun, Dec 21

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

$114Frontier

Find Deal

Fri, Dec 5 - Mon, Dec 8

3:26 pm - 6:32 pmDEN-STL

2h 06mnonstop

8:32 pm - 12:21 pmSTL-DEN

16h 49m1 stop

$115Frontier

Find Deal

Fri, Jan 16 - Sat, Jan 17

7:05 am - 10:14 amDEN-STL

2h 09mnonstop

12:04 pm - 9:02 amSTL-DEN

21h 58m1 stop

$116Frontier

Find Deal

Wed, Dec 10 - Thu, Dec 11

12:59 am - 9:47 amDEN-STL

7h 48m1 stop

7:43 pm - 9:15 pmSTL-DEN

2h 32mnonstop

$118Frontier

Find Deal

Thu, Dec 11 - Mon, Dec 15

Frontier flights from Denver to St. Louis

Our best Frontier deals on Denver to St. Louis flight tickets

Frontier

Dec 12

DEN7:05 amDenver Intl

2h 09m

STL10:14 amLambert-St Louis

Dec 15

STL1:16 pmLambert-St Louis

15h 42m

1 stop

DEN3:58 amDenver Intl

$104

Find similar

Frontier

Jan 7

DEN6:50 amDenver Intl

2h 12m

STL10:02 amLambert-St Louis

Jan 13

STL5:11 pmLambert-St Louis

19h 12m

1 stop

DEN11:23 amDenver Intl

$108

Find similar

Frontier

Jan 8

DEN8:00 amDenver Intl

27h 12m

1 stop

STL12:12 pmLambert-St Louis

Jan 12

STL8:21 pmLambert-St Louis

19h 04m

1 stop

DEN2:25 pmDenver Intl

$110

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Fly from

Fly to

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 12/12

7:05 am-10:14 am

Nonstop2h 09m

Lambert-St Louis

Mon 12/15

1:16 pm-3:58 am

1 stop15h 42m

$104

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 1/7

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

Tue 1/13

5:11 pm-11:23 am

1 stop19h 12m

$108

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 1/8

8:00 am-12:12 pm

1 stop27h 12m

Lambert-St Louis

Mon 1/12

8:21 pm-2:25 pm

1 stop19h 04m

$110

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 1/30

3:38 pm-6:44 pm

Nonstop2h 06m

Lambert-St Louis

Sun 2/1

1:03 pm-11:52 pm

1 stop11h 49m

$111

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 12/5

7:05 am-10:14 am

Nonstop2h 09m

Lambert-St Louis

Mon 12/8

12:07 pm-12:20 am

1 stop13h 13m

$112

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 12/17

7:05 am-10:14 am

Nonstop2h 09m

Lambert-St Louis

Sun 12/21

10:10 pm-3:58 am

1 stop6h 48m

$113

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 12/5

7:05 am-10:14 am

Nonstop2h 09m

Lambert-St Louis

Mon 12/8

7:43 pm-9:15 pm

Nonstop2h 32m

$114

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 1/16

3:26 pm-6:32 pm

Nonstop2h 06m

Lambert-St Louis

Sat 1/17

8:32 pm-12:21 pm

1 stop16h 49m

$115

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 12/10

7:05 am-10:14 am

Nonstop2h 09m

Lambert-St Louis

Thu 12/11

12:04 pm-9:02 am

1 stop21h 58m

$116

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Thu 12/11

12:59 am-9:47 am

1 stop7h 48m

Lambert-St Louis

Mon 12/15

7:43 pm-9:15 pm

Nonstop2h 32m

$118

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How to get the cheapest flight ticket from Denver to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

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

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 $183.

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

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $228. 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 $321. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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

Flying to St. Louis from Denver in the morning is the least expensive time of day to depart. momondo users have found prices as low as $251 when looking at flights departing in the morning. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $309 per ticket.

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?

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 $230 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 $158 on momondo.

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 November 2025, prices for Denver to St. Louis flights are approximately 119% more expensive when compared to flights at the same time last year.

When to book flights from Denver to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Denver to St. Louis according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

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

Find info about flight duration, direct flights, and airports for your flight from Denver to St. Louis

Best Price Found	$101
Fastest flight time	1h 58m
Direct flights	Every day
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from Denver in the past 72 hours is $101. The best round-trip flight deal from Denver to St. Louis found on momondo in the last 72 hours is $206.

The fastest flight from Denver to St. Louis takes 1h 58m

Direct flights go from Denver to St. Louis every day.

There is 1 airport near St. Louis: Lambert-St Louis (STL)

Search flight deals

How far is Denver Intl to Lambert-St Louis by plane?
The distance between Denver Intl and Lambert-St Louis is about 794.2 mi. A reasonable flight in good conditions will take 2h 06m.
When did momondo last update prices for flights from Denver Intl Airport to Lambert-St Louis Airport?
Prices for flights from Denver Intl Airport to Lambert-St Louis Airport were last updated today.
How many operators does momondo search for flights from Denver Intl Airport to Lambert-St Louis Airport?
As of November 2025, there are 3 operators available to choose from for flights from Denver Intl Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Denver Intl Airport to Lambert-St Louis Airport?
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.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
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.
What is the most popular plane model from Denver to St. Louis?
momondo data reveals that the most frequently booked plane model on the route from Denver to St. Louis is Boeing 737 MAX 8, representing 16.15% of all bookings. The subsequent popular models are Airbus A320-100/200 at 12.35%, Boeing 737-800 Passenger/BBJ2 (winglets) at 12.30%, and Boeing 737-900 at 10.12%.
What is the most popular airline from Denver to St. Louis?
Based on momondo bookings for flights between Denver and St. Louis, the leading airline is Frontier, making up 51% of the total bookings. Other popular airlines include Southwest with 25% and United Airlines with 23%.

Best airlines flying from Denver to St. Louis

Compare and see reviews for airlines that fly from Denver to St. Louis with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $55	Free Cancellation	Rating 5.8 3,105 reviews	Search Frontier flights
United Airlines	PriceFrom $155	Free Cancellation	Rating 7.4 9,027 reviews	Search United Airlines flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,249 reviews	Search Southwest flights

Southwest Flights From Denver to St. Louis
Southwest is one of the most popular airlines flying from Denver to St. Louis, operating 10 flights/week on average for this route. A good Southwest flight deal for Denver to St. Louis starts from $177 round-trip, up to an average price of $299. Our users have rated Southwest at 8.0/10.
United Airlines Flights From Denver to St. Louis
Another popular option for Denver to St. Louis flights is United Airlines (7.4/10, 9,027 ratings). United Airlines flies from Denver to St. Louis around 18 times per week, with deals starting from $155 round-trip and rising to an average price of around $325.

St. Charles

Chesterfield

Hermann

Fairview Heights

Florissant

Maryland Heights

O'Fallon

Wentzville

Fenton

Collinsville

St. Peters

Alton

Farmington

Festus

Glencoe

Edwardsville

Clayton

Eureka

Litchfield

Shrewsbury

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Can I find flights from Denver to St. Louis with flexible booking policies on momondo?

All flight searches from Denver to St. Louis on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Denver to St. Louis?

Once you have performed a search for Denver to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Denver to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Denver and alert you when they change.

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Cheap flights from Denver to St. Louis from $24

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to St. Louis departing on 12/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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How to get the cheapest flight ticket from Denver to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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 November 2025, prices for Denver to St. Louis flights are approximately 119% 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 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?

7 flights are operational daily from Denver to St. Louis as of November 2025. The most popular departure time for this route is 9:00AM, with 48% of flights per day taking off at noon.

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

50 flights are operational weekly from Denver to St. Louis as of November 2025. The most popular departure day for this route is Thu, with 24% 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

Find info about flight duration, direct flights, and airports for your flight from Denver to St. Louis

Best Price Found

Fastest flight time

Direct flights

Airports in St. Louis

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?

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

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?

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

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

Best airlines flying from Denver to St. Louis

Compare and see reviews for airlines that fly from Denver to St. Louis with momondo

Southwest Flights From Denver to St. Louis

United Airlines Flights From Denver to St. Louis

Traveling to a place near St. Louis?

Why use momondo?

Why should I use momondo to find a flight deal from Denver to St. Louis?

Can I find flights from Denver to St. Louis with flexible booking policies on momondo?

How can momondo help me find flights from Denver to St. Louis?

I’m not ready to book a flight from Denver to St. Louis right now. Can momondo alert me if prices change?

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

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Airports servicing Missouri