HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Charles

$65+ Cheap flights from Denver (DEN) to St. Charles, MO

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
may. 4 — may. 111
dom. 5/4
dom. 5/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Denver to St. Charles with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Denver Intl to St. Charles are usually found in July or May, booked 78 days in advance, depart on a Saturday or Wednesday and return on a Friday

Cheap flight deals from Denver to St. Charles

Keep the following information in mind while searching for Denver to St. Charles flight deals. Data was last updated abril 29, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$116
(Kiwi.com)

One-way from

$65
(Cheapflightsfares)

Popular in

March

Cheapest in

July

Average price

$230
Provider with most accurate pricing for Denver Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Lambert-St Louis flights.
Search Deals
From Denver Intl to St. Charles
Search Deals
One-way flight from Denver Intl to St. Charles
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from Denver to St. Charles

Cheapest flights from Denver to St. Charles
Explore the most affordable flight options available from Denver to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 29, 2025.

This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/117:00 amDEN - STL
Nonstop2h 08mFrontier
mié. 6/187:29 pmSTL - DEN
Nonstop2h 27mFrontier
Deal found 4/28$116
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/271:25 pmDEN - STL
Nonstop2h 06mUnited Airlines
mié. 5/284:32 pmSTL - DEN
Nonstop2h 29mUnited Airlines
Deal found 4/28$210
This CheapOair deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 6/276:00 amDEN - STL
Nonstop2h 12mMultiple Airlines
dom. 6/296:12 amSTL - DEN
1 stop6h 06mMultiple Airlines
Deal found 4/28$214
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 6/265:01 amDEN - STL
1 stop5h 57mAmerican Airlines
mar. 7/14:41 pmSTL - DEN
1 stop7h 15mAmerican Airlines
Deal found 4/29$217
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/219:15 amDEN - STL
1 stop6h 45mDelta
mié. 5/287:30 amSTL - DEN
1 stop8h 15mDelta
Deal found 4/28$227
This Southwest deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/277:15 pmDEN - STL
Nonstop2h 10mSouthwest
jue. 6/55:05 amSTL - DEN
1 stop4h 25mSouthwest
Deal found 4/28$247

Cheapflights Fare Finder

Customize your flight search to find flights from Denver to St. Charles that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated abril 29, 2025.
Use the filters below to find and compare flights from Denver to St. Charles that are best for you.

Fly from

Denver

Fly to

St. Charles

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mié. 6/11

7:00 am-10:08 am

Nonstop2h 08m

Lambert-St Louis

mié. 6/18

7:29 pm-8:56 pm

Nonstop2h 27m

$116

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mar. 5/27

1:25 pm-4:31 pm

Nonstop2h 06m

Lambert-St Louis

mié. 5/28

4:32 pm-6:01 pm

Nonstop2h 29m

$210

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

vie. 6/27

6:00 am-9:12 am

Nonstop2h 12m

Lambert-St Louis

dom. 6/29

6:12 am-11:18 am

1 stop6h 06m

$214

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 6/26

5:01 am-11:58 am

1 stop5h 57m

Lambert-St Louis

mar. 7/1

4:41 pm-10:56 pm

1 stop7h 15m

$217

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mar. 5/27

6:30 am-1:15 pm

1 stop5h 45m

Lambert-St Louis

mié. 5/28

5:55 pm-7:20 pm

Nonstop2h 25m

$220

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mié. 5/21

9:15 am-5:00 pm

1 stop6h 45m

Lambert-St Louis

mié. 5/28

7:30 am-2:45 pm

1 stop8h 15m

$227

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mié. 5/14

6:50 am-9:59 am

Nonstop2h 09m

$65

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

vie. 5/30

6:30 pm-2:54 pm

1 stop19h 24m

$108

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

vie. 6/6

12:59 am-8:56 am

1 stop6h 57m

$109

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 5/29

8:40 pm-11:59 pm

Nonstop2h 19m

$126

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 14 results
1
2

Best time to book a flight from Denver to St. Charles

Have a flexible travel schedule? Discover the best time to fly to St. Charles from Denver with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Denver to St. Charles

How far ahead should I book a flight from Denver to St. Charles?

Use this chart to determine the optimal time to book a round-trip flight from Denver to St. Charles. Price data was last updated on April 25, 2025.

To ensure you get the cheapest price possible for a flight from Denver to St. Charles, you should look to book at least 78 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Denver to St. Charles?

Currently, August is the cheapest month in which you can book a flight from Denver to St. Charles (average of $311). Flying from Denver to St. Charles in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DEN to CH5?

Find hourly flight availability from Denver to St. Charles. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 29, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Denver to St. Charles as you normally would.

What is the cheapest day to fly from Denver to St. Charles?

Use this chart to determine the cheapest time to fly round-trip from Denver to St. Charles. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Denver to St. Charles flight should consider departing on Wednesday mornings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in St. Charles by month

Plan your trip to St. Charles by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Charles ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Charles when rainfall is around 2.2 in.

Temperature in St. Charles by month

Plan your trip to St. Charles by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Charles, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Charles

Get insights into the airlines that provide service to St. Charles. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Charles. Reviews last updated abril 29, 2025.
To help decide which airline to fly from Denver to St. Charles, see what other customers have to say about Alaska Airlines, Southwest and Delta. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,295 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Food

7.1

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

Find useful and relevant information for your journey from Denver to St. Charles. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Denver to St. Charles?

    Denver Intl (DEN), located 18.5 mi from the city center, is the airport you fly out of when you book flights from Denver to St. Charles. 4 airlines have flights from Denver Intl to St. Charles on a regular basis. Booking flights from Denver Intl to St. Charles should not be difficult; the airport handles an average of 7 outbound flights to St. Charles per day.

  • How popular is this Denver to St. Charles flight route?

    The Denver Intl to St. Charles flight path was viewed by 27 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from Denver to St. Charles one-way?

    The cheapest airlines for a one-way flight from Denver to St. Charles are Frontier ($65), Sun Country Air ($108), and Delta ($109).

  • What are the most reliable airlines from Denver to St. Charles?

    The top 3 most reliable airlines when flying from Denver to St. Charles are Sun Country Air (100%), Frontier (89%) and Air Canada (84%).

  • What are the cheapest flights from Denver to St. Charles?

    While on average a flight from Denver to St. Charles is generally $220, our data shows the cheapest flight currently is $69. When looking at the most popular route, (Denver Intl - Lambert-St Louis), you can expect to pay $157 for that flight.

  • Can I find deals for flights from Denver to St. Charles that include hotel bookings?

    Yes. In addition to deals on Denver to St. Charles flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Denver to St. Charles?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Denver to St. Charles.

  • Can I find deals for business class flights from Denver to St. Charles?

    Yes. Cheapflights offers flight deals from Denver to St. Charles by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Denver to St. Charles?

    Currently, August is the cheapest month in which you can book a flight from Denver to St. Charles (average of $311). Flying from Denver to St. Charles in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Denver to St. Charles

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Kansas City flights
Denver to St. Louis flights
Denver to Springfield flights
Colorado Springs to Springfield flights
Grand Junction to Kansas City flights
Colorado Springs to St. Louis flights
Denver to Joplin flights
Colorado Springs to Kansas City flights
Montrose to Kansas City flights
Grand Junction to St. Louis flights
Durango to St. Louis flights
Aspen to Kansas City flights
Denver to Columbia flights
Vail to St. Louis flights
Colorado Springs to Joplin flights
Vail to Kansas City flights
Montrose to St. Louis flights
Aspen to St. Louis flights
Gunnison to St. Louis flights
Colorado Springs to Columbia flights
Grand Junction to Joplin flights
Durango to Springfield flights
Grand Junction to Springfield flights
Durango to Kansas City flights
Hayden to Kansas City flights
Hayden to St. Louis flights
Montrose to Joplin flights
Denver to Branson flights
Montrose to Springfield flights

Top 4 airlines flying from Denver to St. Charles

Discover the top 4 airlines that operate flights from Denver to St. Charles. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated abril 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$45Average$144FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$150Average$320FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$173Average$300FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$306Average$427FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.