Cheap flights from St. Louis to Denver (STL - DEN)

STL — DEN
Feb 7 — Feb 141

The best prices from Lambert-St Louis to Denver Intl are usually found in October or January, booked 27 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

How to find the cheapest flight from St. Louis (STL) to Denver (DEN)

All the information you need to plan the best STL to DEN flight in 2023: compare St. Louis to Denver flight prices with the expected peak season, weather and rainfall in Denver.

STL - DEN

Price

$163 - $268

DEN

Temperature

30.2 - 73.4 °F

DEN

Rainfall

0.5 - 2.3 inches

Popular inJuneHigh demand for flights, 24% potential price rise
Cheapest inOctoberBest time to find cheap flights, 20% potential price drop
Round-trip from$163From Lambert-St Louis to Denver Intl
One-way from$77One-way flight from Lambert-St Louis to Denver Intl

What is the cheapest day to fly round-trip from St. Louis to Denver?

Sunday flights are generally found to be more expensive for flights from St. Louis to Denver. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Denver.

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

Find a great deal and save up to 17% by booking at least 23 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to Denver within the next two weeks, with the cheapest ticket starting at $198.

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

October can be a great time to fly to Denver from St. Louis with a flight ticket averaging about $203. Cheapflights users have found deals in the month of October for as cheap as $96. The most expensive prices can be found in the month of June.

When is the cheapest time to fly from St. Louis to Denver (STL - DEN)?

It’s optimal to fly from St. Louis to Denver in the evening. By choosing this option you can save up to 37% on the cost of your flight, compared to a flight at noon.

Cheap flights from St. Louis to Denver in February, March 2023

The best prices found for STL to DEN flights for February, March
Feb 28 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 28m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$34

Frontier

Pick Dates

Deal found 1/31

Mar 1 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$40

Frontier

Pick Dates

Deal found 1/30

Mar 1 - Mar 8
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 07m
$48

Frontier

Pick Dates

Deal found 1/31

St. Louis to Denver 2023 flight deals

Cheap flights to Denver from St. Louis found for this year
Feb 28 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 28m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$34

Frontier

Pick Dates

Deal found 1/31

Mar 1 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$40

Frontier

Pick Dates

Deal found 1/30

Mar 1 - Mar 8
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 07m
$48

Frontier

Pick Dates

Deal found 1/31

Cheap Frontier flights from St. Louis to Denver

Feb 28 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 28m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$34

Frontier

Pick Dates

Deal found 1/31

Mar 1 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$40

Frontier

Pick Dates

Deal found 1/30

Mar 1 - Mar 8
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 07m
$48

Frontier

Pick Dates

Deal found 1/31

Non-stop flights to Denver from St. Louis

Save time with St. Louis to Denver direct flight deals
Feb 28 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 28m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$34

Frontier

Pick Dates

Deal found 1/31

Mar 1 - Mar 7
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 11m
$40

Frontier

Pick Dates

Deal found 1/30

Mar 1 - Mar 8
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 07m
$48

Frontier

Pick Dates

Deal found 1/31

Last minute flights from St. Louis to Denver

Late deals on return flights to Denver from St. Louis, departing today and this week
Feb 8 - Feb 15
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 38m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 07m
$80

Frontier

Pick Dates

Deal found 2/1

Feb 8 - Feb 12
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 38m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 07m
$98

Frontier

Pick Dates

Deal found 1/31

Feb 8 - Feb 11
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 38m
DEN

Denver Intl

STL

Lambert-St Louis

Nonstop

2h 07m
$100

Frontier

Pick Dates

Deal found 2/2

One-way flights to Denver from St. Louis

The cheapest one-way flights from St. Louis to Denver
Mar 1
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
$20

Frontier

Pick Dates

Deal found 1/31

Feb 22
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
$31

Frontier

Pick Dates

Deal found 1/31

Mar 1
STL

Lambert-St Louis

DEN

Denver Intl

Nonstop

2h 39m
$34

Frontier

Pick Dates

Deal found 2/1

Reviews of Airlines Servicing Denver

Delta
7.9
Good
2,050 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.0

Food

7.2

Reviews

1 / 10

Gave my toddler a coloring book and crayons before boarding. Very nice. Also got “wings” and gummy bears towards end of flight. Very nice.

Delta
7.9
Good
2,050 reviews
Delta
7.9
Good
2,050 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.0

Food

7.2

Reviews

1 / 10

Gave my toddler a coloring book and crayons before boarding. Very nice. Also got “wings” and gummy bears towards end of flight. Very nice.

American Airlines
7.4
Good
1,668 reviews
Delta
7.9
Good
2,050 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.0

Food

7.2

Reviews

1 / 10

Gave my toddler a coloring book and crayons before boarding. Very nice. Also got “wings” and gummy bears towards end of flight. Very nice.

Spirit Airlines
6.9
Okay
716 reviews
Delta
7.9
Good
2,050 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.0

Food

7.2

Reviews

1 / 10

Gave my toddler a coloring book and crayons before boarding. Very nice. Also got “wings” and gummy bears towards end of flight. Very nice.

Frontier
6.1
Okay
538 reviews
Delta
7.9
Good
2,050 reviews

Entertainment

7.8

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.0

Food

7.2

Reviews

1 / 10

Gave my toddler a coloring book and crayons before boarding. Very nice. Also got “wings” and gummy bears towards end of flight. Very nice.

Related info for your journey

Useful info, stats and facts about St. Louis to Denver flights.

What airports do I use to fly from St. Louis to Denver?

You will need to book a flight from Lambert-St Louis to Denver Intl if you want to fly from St. Louis to Denver. At least 7 different airlines have flights from Lambert-St Louis (STL) to Denver Intl (DEN) on a regular basis. There are 11 flights to Denver from the St. Louis airport per day. If you manage to book one that is nonstop, then you can expect the flight time from STL to DEN to be around 2h 22m.

Which airlines flying from Lambert-St Louis to Denver Intl have flexible cancellations due to COVID-19?

Some of the carriers operating flights from Lambert-St Louis to Denver Intl that may be offering flexible cancellation policies are Frontier, United Airlines, and Juneyao Airlines. Our site will let you filter for all airlines offering greater flexibility due to COVID-19.

Can I find flights from St. Louis to Denver for under $100 on Cheapflights?

Yes, there are multiple flights from St. Louis to Denver for under $100. The cheapest flight booked recently is on Frontier for just $34, but on average you can expect to pay $69.

Are there nonstop flights from St. Louis to Denver for under $100 on Cheapflights?

Cheapflights has at least 20 direct flights from St. Louis to Denver under $100. A good price for a nonstop flight from St. Louis to Denver is less than $68.

Are there last-minute flights available from St. Louis to Denver for under $100?

There are currently 20+ open flights from St. Louis to Denver within the next 7 days for less than $100.

What days are nonstop flights available from St. Louis to Denver?

Days when nonstop flights are available for this flight are: Sunday, Thursday, Friday, Saturday.

How popular is this St. Louis to Denver flight route?

Flights from Lambert-St Louis to Denver Intl have been viewed 193 times in the past calendar month.

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

9 flight departures from St. Louis to Denver per day on average.
Early Morning (Midnight to 6am) - 11% of flight departures
Afternoon (Noon - 6pm) - 89% of flight departures

How long is the flight from St. Louis to Denver?

Departing from St. Louis to Denver will take you 2h 28m. Airlines will cover a distance of 772 mi. Generally, flights for this route are nonstop.

What is the cheapest airline to fly from St. Louis to Denver round-trip?

Frontier, at $34, was found to be the cheapest airline from St. Louis to Denver.. Users have found that Frontier is 83% cheaper than the other options available to this destination.

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

One-way options have recently been found by users for as low as $20 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $77 and American Airlines from $89 one-way.

What are the most popular airlines that fly from St. Louis to Denver?

When booking a flight from St. Louis to Denver, you may want to consider flying on American Airlines, Delta or Frontier as they are the most popular for this route.

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

No one likes to see their flight delayed. When booking a flight from St. Louis to Denver consider choosing United Airlines (74%), Southwest (73%) or Air Canada (69%) as they are the most reliable in getting you off to your destination on time.

What are the cheapest flights from St. Louis to Denver?

Looking for the cheapest flight from St. Louis to Denver? While on average our users pay $723, our data indicates the cheapest price to be $36. The most popular route (Lambert-St Louis - Denver Intl), is priced around $92.

Alternative routes for St. Louis to Denver

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from St. Louis to Denver

The chart below displays the airlines Cheapflights users traveling from St. Louis to Denver choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
Juneyao AirlinesCheapest$14Average$24FlexibilityNo cancel feeOn-time66%COVID-19 safety
Search Juneyao Airlines flights
FrontierCheapest$59Average$164FlexibilityNo cancel feeOn-time62%COVID-19 safety
Search Frontier flights
United AirlinesCheapest$124Average$325FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights
DeltaCheapest$158Average$400FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
American AirlinesCheapest$234Average$472FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights

Hourly flight availability from St. Louis to Denver

See what time of day planes typically take off from St. Louis to Denver
7%of flight departuresEarly morningMidnight to 6 am
35%of flight departuresMorning6 am to noon
52%of flight departuresAfternoonNoon to 6 pm
6%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to Denver

See how many times per day planes take to the skies headed from St. Louis to Denver
Sunday4daily flights
Monday15daily flights
Tuesday14daily flights
Wednesday15daily flights
Thursday14daily flights
Friday13daily flights
Saturday5daily flights
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