Cheap flights from St. Louis to Denver (STL - DEN) from $39

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 4/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — DEN
Mar 23 — Mar 301

The best prices from Lambert-St Louis to Denver Intl are usually found in October or September, booked 55 days in advance, depart on a Tuesday or Saturday and return on a Wednesday

Cheap flight deals from St. Louis to Denver

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 19, 2024.

Popular in

December

Cheapest in

October

Round-trip from

$193

One-way from

$99
High demand for flights, 29% potential price rise
Best time to find cheap flights, 24% potential price drop
From Lambert-St Louis to Denver Intl
One-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 63% by booking at least 56 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 $128.

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 $155. Cheapflights users have found deals in the month of October for as cheap as $40. The most expensive prices can be found in the month of December.

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 60% on the cost of your flight, compared to a flight at noon.

Cheap Frontier flights from St. Louis to Denver

Explore cheap flight options specifically provided by Frontier for the route between St. Louis and Denver. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,145,932 searches. Data last updated March 19, 2024.
Find some of the cheapest Frontier flights traveling from St. Louis to Denver. It's recommended that users confirm their flight details before booking.
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 5/712:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$58
Sat 4/138:04 pmSTL - DEN
Nonstop2h 31mFrontier
Tue 4/1612:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$63
Tue 4/234:50 pmSTL - DEN
Nonstop2h 30mFrontier
Thu 4/257:30 amDEN - STL
Nonstop2h 08mFrontier
Deal found 3/17$68
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 4/226:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/16$73
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/18$78
Fri 4/56:18 pmSTL - DEN
Nonstop2h 32mFrontier
Tue 4/96:05 pmDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$84
Sat 4/138:04 pmSTL - DEN
Nonstop2h 31mFrontier
Sun 4/1411:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/18$87
Sat 5/118:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 5/136:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/17$88
Thu 5/211:38 amSTL - DEN
Nonstop2h 29mFrontier
Fri 5/36:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/18$89

Cheap United Airlines flights from St. Louis to Denver

Explore cheap flight options specifically provided by United Airlines for the route between St. Louis and Denver. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,145,932 searches. Data last updated March 19, 2024.
Have a look at some of the cheapest available United Airlines flights departing from St. Louis and landing in Denver. Make sure to examine the flight information before completing your reservation.
Mon 4/84:49 pmSTL - DEN
Nonstop2h 27mUnited Airlines
Wed 4/246:48 pmDEN - STL
Nonstop2h 04mUnited Airlines
Deal found 3/17$234
Wed 3/275:30 pmSTL - DEN
1 stop6h 42mUnited Airlines
Sat 3/307:54 amDEN - STL
2 stops12h 58mUnited Airlines
Deal found 3/17$489
Mon 3/255:30 pmSTL - DEN
3 stops16h 30mUnited Airlines
Sun 4/217:50 amDEN - STL
1 stop6h 56mUnited Airlines
Deal found 3/17$492
Wed 3/275:30 pmSTL - DEN
1 stop5h 29mUnited Airlines
Sun 3/315:54 pmDEN - STL
2 stops19h 29mUnited Airlines
Deal found 3/17$514
Thu 3/281:40 pmSTL - DEN
Nonstop2h 34mUnited Airlines
Thu 3/286:00 pmDEN - STL
Nonstop2h 03mUnited Airlines
Deal found 3/18$617
Thu 3/286:00 amSTL - DEN
1 stop5h 35mUnited Airlines
Thu 3/281:25 pmDEN - STL
Nonstop2h 03mUnited Airlines
Deal found 3/18$627
Thu 3/281:40 pmSTL - DEN
Nonstop2h 34mUnited Airlines
Sat 3/301:25 pmDEN - STL
Nonstop2h 03mUnited Airlines
Deal found 3/18$755

Cheap St. Louis to Denver flights in March & April 2024

Find cheap flight options from St. Louis to Denver specifically for the months of March and April 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,145,932 searches. Prices were last updated on March 19, 2024.
These are some of the most attractive deals on flights from St. Louis to Denver in 2024. More deals are always being added, so be sure to check back regularly.
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 5/712:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$58
Sat 4/138:04 pmSTL - DEN
Nonstop2h 31mFrontier
Tue 4/1612:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$63
Tue 4/234:50 pmSTL - DEN
Nonstop2h 30mFrontier
Thu 4/257:30 amDEN - STL
Nonstop2h 08mFrontier
Deal found 3/17$68
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 4/226:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/16$73
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/18$78
Fri 4/56:18 pmSTL - DEN
Nonstop2h 32mFrontier
Tue 4/96:05 pmDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$84
Sun 4/143:29 pmSTL - DEN
Nonstop2h 33mFrontier
Sun 4/2111:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$97
Sun 4/143:29 pmSTL - DEN
Nonstop2h 33mFrontier
Sun 4/2111:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$98
Tue 4/164:50 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 4/2310:54 pmDEN - STL
1 stop10h 24mFrontier
Deal found 3/17$101

St. Louis to Denver 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Denver in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,145,932 searches. Data last updated March 19, 2024.
These are some of the most attractive deals on flights from St. Louis to Denver in 2024. More deals are always being added, so be sure to check back regularly.
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 5/712:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$58
Sat 4/138:04 pmSTL - DEN
Nonstop2h 31mFrontier
Tue 4/1612:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$63
Tue 4/234:50 pmSTL - DEN
Nonstop2h 30mFrontier
Thu 4/257:30 amDEN - STL
Nonstop2h 08mFrontier
Deal found 3/17$68
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 4/226:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/16$73
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/18$78
Fri 4/56:18 pmSTL - DEN
Nonstop2h 32mFrontier
Tue 4/96:05 pmDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$84
Wed 5/18:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 5/66:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/17$87
Sat 5/118:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 5/136:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/17$88
Sun 4/143:29 pmSTL - DEN
Nonstop2h 33mFrontier
Sun 4/2111:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$97

Non-stop flights to Denver from St. Louis

Discover non-stop flight options from St. Louis to Denver. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 3,145,932 searches. Data last updated March 19, 2024.
Consider booking one of these non-stop flights heading from St. Louis to Denver. Select from other flights from St. Louis to Denver by using the search form above.
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Tue 5/712:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$58
Sat 4/138:04 pmSTL - DEN
Nonstop2h 31mFrontier
Tue 4/1612:45 pmDEN - STL
Nonstop2h 05mFrontier
Deal found 3/16$63
Tue 4/234:50 pmSTL - DEN
Nonstop2h 30mFrontier
Thu 4/257:30 amDEN - STL
Nonstop2h 08mFrontier
Deal found 3/17$68
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 4/226:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/16$73
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/18$78
Fri 4/56:18 pmSTL - DEN
Nonstop2h 32mFrontier
Tue 4/96:05 pmDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$84
Wed 5/18:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 5/66:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/17$87
Sat 5/118:04 pmSTL - DEN
Nonstop2h 31mFrontier
Mon 5/136:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 3/17$88
Sun 4/143:29 pmSTL - DEN
Nonstop2h 33mFrontier
Sun 4/2111:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$97

St. Louis to Denver flights leaving soon

Find last-minute flight options from St. Louis to Denver for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,145,932 searches. Data last updated March 19, 2024.
Consider one of these great deals we found on last-minute flights from St. Louis to Denver. Users should examine the flight details to ensure there are no surprises.
Tue 3/2610:04 pmSTL - DEN
Nonstop2h 36mFrontier
Tue 4/26:05 pmDEN - STL
Nonstop2h 09mFrontier
Deal found 3/18$98
Wed 3/278:45 pmSTL - DEN
Nonstop2h 32mFrontier
Thu 3/287:07 pmDEN - STL
Nonstop2h 08mFrontier
Deal found 3/17$118
Mon 3/258:45 pmSTL - DEN
Nonstop2h 32mFrontier
Sun 4/2111:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$128
Tue 3/2610:04 pmSTL - DEN
Nonstop2h 36mFrontier
Tue 4/211:31 pmDEN - STL
1 stop9h 52mFrontier
Deal found 3/18$138
Mon 3/257:37 pmSTL - DEN
1 stop13h 21mFrontier
Wed 4/36:55 amDEN - STL
Nonstop2h 17mFrontier
Deal found 3/18$148
Thu 3/2811:15 pmSTL - DEN
Nonstop2h 35mFrontier
Sun 3/317:17 pmDEN - STL
Nonstop2h 08mFrontier
Deal found 3/17$156
Mon 3/257:37 pmSTL - DEN
1 stop16h 46mFrontier
Sun 4/2111:20 amDEN - STL
Nonstop2h 09mFrontier
Deal found 3/17$157
Thu 3/2811:15 pmSTL - DEN
Nonstop2h 35mFrontier
Wed 4/38:28 pmDEN - STL
1 stop12h 55mFrontier
Deal found 3/18$158
Sat 3/237:04 pmSTL - DEN
Nonstop2h 34mFrontier
Thu 3/287:07 pmDEN - STL
Nonstop2h 08mFrontier
Deal found 3/17$162

One-way flights to Denver from St. Louis

Search for one-way flight options from St. Louis to Denver. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,145,932 searches. Data last updated March 19, 2024.
Users in need of a one-way flight from St. Louis to Denver can choose from these deals. Users can also find round-trip St. Louis to Denver flights by using the search form above.
Thu 4/1811:18 amSTL - DEN
Nonstop2h 29mFrontier
Deal found 3/17$39
Fri 4/125:35 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 3/17$45
Sat 5/188:00 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 3/17$47
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 3/17$49
Wed 5/228:00 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 3/18$54
Fri 4/56:18 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 3/17$55
Fri 5/178:00 pmSTL - DEN
Nonstop2h 28mFrontier
Deal found 3/17$59
Wed 4/177:51 pmSTL - DEN
1 stop14h 09mFrontier
Deal found 3/17$68
Mon 3/258:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 3/17$69

Find flights from St. Louis to Denver within your budget

Customize your flight search to find flights from St. Louis to Denver 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 3,145,932 searches. Data last updated March 19, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$58 - $234

Route

Depart

Return

Price

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Tue 4/30

Nonstop2h 30m

Denver Intl

Tue 5/7

Nonstop2h 05m

$58

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Sat 4/13

Nonstop2h 31m

Denver Intl

Tue 4/16

Nonstop2h 05m

$63

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Tue 4/23

Nonstop2h 30m

Denver Intl

Thu 4/25

Nonstop2h 08m

$68

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Sat 4/20

Nonstop2h 31m

Denver Intl

Mon 4/22

Nonstop2h 06m

$73

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Wed 4/10

Nonstop2h 31m

Denver Intl

Wed 4/17

Nonstop2h 06m

$78

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Tue 4/16

Nonstop2h 30m

Denver Intl

Mon 4/22

2 stops11h 51m

$141

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Wed 5/1

1 stop6h 40m

Denver Intl

Tue 5/7

1 stop5h 50m

$176

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Sat 4/13

1 stop9h 05m

Denver Intl

Sun 4/14

1 stop9h 14m

$220

Lambert-St LouisDenver Intl

STL - DEN

STLDEN

Lambert-St Louis

Mon 4/8

Nonstop2h 27m

Denver Intl

Wed 4/24

Nonstop2h 04m

$234

Flights are sorted by cheapest first

Deals found on 3/16

When is the best time to book a flight from St. Louis to Denver?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Denver. Price data was last updated on January 28, 2024.
Booking 55 days in advance of your planned departure date is, on average, the best time to get cheap flights from St. Louis to Denver. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Search Deals

When is the cheapest time to fly from St. Louis to Denver?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Denver. Price data was last updated on March 10, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their St. Louis to Denver flight should consider departing on Tuesday evenings when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Denver by month

Plan your trip from St. Louis to Denver by taking into account the cheapest months to travel. The average price of a one-way flight from St. Louis to Denver is currently $54 while a round-trip flight costs $123. Price data was last updated on March 10, 2024.

Currently, December is the cheapest month in which you can book a flight from St. Louis to Denver (average of $193). Flying from St. Louis to Denver in June is currently the most expensive (average of $306). 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.

January

$220

February

$237

March

$269

April

$226

May

$240

June

$306

July

$290

August

$220

September

$216

October

$194

November

$198

December

$193

Temperature and rainfall in Denver by month

Plan your trip to Denver by taking into account the average temperature and rainfall totals by month.

DEN

Temperature

30.2 - 73.4 °F

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated March 19, 2024.
Read through reviews of airlines operating flights from St. Louis to Denver, such as Frontier, United Airlines and Delta. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
9,147 reviews

Crew

8.6

Overall

8.1

Boarding

8.3

Comfort

7.9

Food

7.3

Entertainment

7.4

Reviews

1 / 10

This is trivial however, I was in row 11B there aren’t any windows in that row. I enjoy being able to look out the window.

8.1
Very good
9,147 reviews
8.1
Very good
9,147 reviews

Crew

8.6

Overall

8.1

Boarding

8.3

Comfort

7.9

Food

7.3

Entertainment

7.4

Reviews

1 / 10

This is trivial however, I was in row 11B there aren’t any windows in that row. I enjoy being able to look out the window.

8.1
Very good
11,551 reviews
8.1
Very good
9,147 reviews

Crew

8.6

Overall

8.1

Boarding

8.3

Comfort

7.9

Food

7.3

Entertainment

7.4

Reviews

1 / 10

This is trivial however, I was in row 11B there aren’t any windows in that row. I enjoy being able to look out the window.

7.4
Good
11,618 reviews
8.1
Very good
9,147 reviews

Crew

8.6

Overall

8.1

Boarding

8.3

Comfort

7.9

Food

7.3

Entertainment

7.4

Reviews

1 / 10

This is trivial however, I was in row 11B there aren’t any windows in that row. I enjoy being able to look out the window.

7.3
Good
15,312 reviews
8.1
Very good
9,147 reviews

Crew

8.6

Overall

8.1

Boarding

8.3

Comfort

7.9

Food

7.3

Entertainment

7.4

Reviews

1 / 10

This is trivial however, I was in row 11B there aren’t any windows in that row. I enjoy being able to look out the window.

7.3
Good
704 reviews
8.1
Very good
9,147 reviews

Crew

8.6

Overall

8.1

Boarding

8.3

Comfort

7.9

Food

7.3

Entertainment

7.4

Reviews

1 / 10

This is trivial however, I was in row 11B there aren’t any windows in that row. I enjoy being able to look out the window.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • 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 4 different airlines have flights from Lambert-St Louis (STL) to Denver Intl (DEN) on a regular basis. There are 18 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 21m.

  • 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 $58, but on average you can expect to pay $93.

  • 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 $101.

  • 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: Tuesday, Wednesday, Thursday, Friday, Saturday.

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

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

    3 flight departures from St. Louis to Denver per day on average.
    Morning (6am - Noon) - 100% of flight departures

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

    Departing from St. Louis to Denver will take you 2h 30m. 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 $58, was found to be the cheapest airline from St. Louis to Denver.. Users have found that Frontier is 62% 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 $39 on Frontier. Other airlines that offer cheap prices include Delta from $88 and Sun Country Air from $98 one-way.

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

  • 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 Frontier (92%), United Airlines (82%) or Air Canada (81%) 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 $793, our data indicates the cheapest price to be $39. The most popular route (Lambert-St Louis - Denver Intl), is priced around $113.

  • What does STL to DEN mean?

    Great question - STL to DEN just means Lambert-St Louis Airport to Denver Intl Airport. Now you’ll know what these unique codes when you look for flights!

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.

Top 4 airlines flying from St. Louis to Denver

Discover the top 4 airlines that operate flights from St. Louis to Denver. 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 3,145,932 searches. Data last updated March 19, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$40Average$118FlexibilityNo cancel feeOn-time62%
Search Frontier flights
United AirlinesCheapest$120Average$311FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$189Average$354FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$193Average$363FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Search flights from St. Louis to Denver by cabin class

Find flights from St. Louis to Denver, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Hourly flight availability from St. Louis to Denver

Find hourly flight availability from St. Louis to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 19, 2024.
8%of flight departuresEarly morningMidnight to 6 am
46%of flight departuresMorning6 am to noon
38%of flight departuresAfternoonNoon to 6 pm
8%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to Denver

Explore weekly flight availability from St. Louis to Denver. 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 March 19, 2024.
Sunday13daily flights
Monday22daily flights
Tuesday20daily flights
Wednesday20daily flights
Thursday21daily flights
Friday21daily flights
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Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Denver?

Deals for St. Louis to Denver flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Denver?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from St. Louis to Denver.

Can Cheapflights find flights from St. Louis to Denver with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from St. Louis to Denver flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from St. Louis to Denver become cheaper?

Yes! Start tracking prices for St. Louis to Denver flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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