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St. Charles

$28+ 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 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — STL
ene. 14 — ene. 211
mié. 1/14
mié. 1/21
1 adult, Economy
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Cheapflights Tip: The best prices from Denver Intl to St. Charles are usually found in January or February, booked 74 days in advance, depart on a Friday or Wednesday and return on a Wednesday

Cheap 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 diciembre 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/13. 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.
jue. 12/2511:59 pmDEN - STL
1 stop7h 13mFrontier
sáb. 1/173:43 pmSTL - DEN
Nonstop2h 37mFrontier
Deal found 12/13$160
This Travelocity deal was found by Cheapflights users on 12/13. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/186:00 amDEN - STL
1 stop25h 12mFrontier
sáb. 1/173:43 pmSTL - DEN
Nonstop2h 37mFrontier
Deal found 12/13$161
This Expedia deal was found by Cheapflights users on 12/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/156:31 pmDEN - STL
1 stop27h 02mFrontier
sáb. 1/173:43 pmSTL - DEN
Nonstop2h 37mFrontier
Deal found 12/13$190
This Super.com deal was found by Cheapflights users on 12/13. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/246:50 amDEN - STL
Nonstop2h 12mFrontier
sáb. 1/173:43 pmSTL - DEN
Nonstop2h 37mFrontier
Deal found 12/13$201
This Expedia deal was found by Cheapflights users on 12/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/236:21 pmDEN - STL
1 stop21h 03mFrontier
vie. 1/307:39 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/15$205
This Expedia deal was found by Cheapflights users on 12/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/297:00 amDEN - STL
1 stop13h 25mFrontier
mié. 12/317:43 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 12/15$227
This Expedia deal was found by Cheapflights users on 12/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:50 amDEN - STL
Nonstop2h 12mFrontier
vie. 1/28:42 pmSTL - DEN
1 stop13h 13mFrontier
Deal found 12/13$231
This Travelocity deal was found by Cheapflights users on 12/12. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/296:15 amDEN - STL
1 stop12h 52mFrontier
jue. 1/110:42 amSTL - DEN
1 stop12h 26mFrontier
Deal found 12/12$234
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
lun. 12/226:15 amDEN - STL
1 stop12h 52mFrontier
mié. 12/244:27 pmSTL - DEN
1 stop7h 37mFrontier
Deal found 12/15$241

Find 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 diciembre 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$102
(Super.com)

One-way from

$28
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$279
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. 9% potential increase in price ($24 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 diciembre 15, 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

vie. 1/9

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

lun. 1/12

7:43 pm-9:15 pm

Nonstop2h 32m

$102

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 1/8

6:31 pm-7:50 am

1 stop12h 19m

Lambert-St Louis

lun. 1/12

1:07 pm-11:19 pm

1 stop11h 12m

$162

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

vie. 1/2

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

dom. 1/4

10:10 pm-3:58 am

1 stop6h 48m

$290

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mié. 1/14

10:10 am-1:16 pm

Nonstop2h 06m

Lambert-St Louis

jue. 1/15

6:00 pm-7:38 pm

Nonstop2h 38m

$300

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mar. 1/13

10:10 am-1:16 pm

Nonstop2h 06m

Lambert-St Louis

mar. 1/20

4:15 pm-5:53 pm

Nonstop2h 38m

$303

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

mié. 2/25

9:50 am-5:05 pm

2 stops6h 15m

Lambert-St Louis

dom. 3/1

5:00 am-10:25 am

2 stops6h 25m

$312

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 1/8

10:10 am-1:16 pm

Nonstop2h 06m

Lambert-St Louis

lun. 1/12

4:15 pm-5:53 pm

Nonstop2h 38m

$320

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

vie. 2/20

10:10 am-1:14 pm

Nonstop2h 04m

Lambert-St Louis

jue. 2/26

6:00 pm-7:34 pm

Nonstop2h 34m

$320

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

jue. 3/12

5:50 pm-8:55 pm

Nonstop2h 05m

Lambert-St Louis

dom. 3/15

5:30 am-7:10 am

Nonstop2h 40m

$327

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

sáb. 3/7

10:15 am-1:19 pm

Nonstop2h 04m

Lambert-St Louis

dom. 3/8

5:30 am-7:10 am

Nonstop2h 40m

$327

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 23 results
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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 December 12, 2025.

To ensure you get the cheapest price possible for a flight from Denver to St. Charles, you should look to book at least 74 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, February is the cheapest month in which you can book a flight from Denver to St. Charles (average of $37). Flying from Denver to St. Charles in July is currently the most expensive (average of $126). 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 diciembre 15, 2025.

A simple way to save on the total cost of your ticket is to fly from Denver to St. Charles at noon. If you’re flexible enough to do this you can expect to save up to 42% on your trip compared to booking a flight in the evening.

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 Friday 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.

Weekly flight availability from Denver to St. Charles

Explore weekly flight availability from Denver to St. Charles. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated diciembre 15, 2025.

The most flights from DEN to CH5 are scheduled on a Monday (12 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).

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 diciembre 15, 2025.
See what other customers who have flown with Southwest, United Airlines, and Frontier from Denver to St. Charles have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
7.9
Good
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
7.9
Good
4,249 reviews
Southwest
7.9
Good
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,092 reviews
Southwest
7.9
Good
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,081 reviews
Southwest
7.9
Good
4,249 reviews

Crew

8.6

Boarding

8.1

Overall

7.9

Entertainment

7.5

Comfort

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 9 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 32 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Denver to St. Charles?

    For as low as $300, Frontier can have you in St. Charles from Denver in 2h 06m. Airlines will cover a distance of 767 mi. Generally, flights for this route are nonstop.

  • 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 ($27), Southwest ($79), and United Airlines ($111).

  • 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 SkyWest Airlines (100%), Frontier (92%) and Air Canada (89%).

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

    While on average a flight from Denver to St. Charles is generally $224, our data shows the cheapest flight currently is $40. When looking at the most popular route, (Denver Intl - Lambert-St Louis), you can expect to pay $130 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, February is the cheapest month in which you can book a flight from Denver to St. Charles (average of $37). Flying from Denver to St. Charles in July is currently the most expensive (average of $126). 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

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Alternative routes for Denver to St. Charles

See prices for flight routes from nearby airports that may be better suited for you.
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Denver to Branson 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 diciembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$162FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$136Average$474FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$158Average$297FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$177Average$301FlexibilityNo cancel feeOn-time63%

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