Cheap flights from Denver to St. Louis (DEN - STL) from $27

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 5/8. 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.
DEN — STL
Feb 27 — Mar 51

The best prices from Denver Intl to Lambert-St Louis are usually found in February or September, booked 54 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from Denver to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to St. Louis (STL). 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 February 22, 2024.

Popular in

December

Cheapest in

February

Round-trip from

$323

One-way from

$88
High demand for flights, 35% potential price rise
Best time to find cheap flights, 22% potential price drop
From Denver Intl to Lambert-St Louis
One-way flight from Denver Intl to Lambert-St Louis

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

Users have found that flying from Denver to St. Louis on a Monday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

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

Users have found that booking a flight from Denver to St. Louis at least 55 days early can save you up to 55% on average compared to booking a flight this week. If booking 55 days before your flight isn’t an option for you, users have found flights from Denver to St. Louis for as little as $136 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $238 for flights departing within the next 3 days.

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

Flights from Denver to St. Louis lean towards being more expensive in December. Prices are generally better when you fly from Denver to St. Louis in February, with the cheapest ticket starting at $46.

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

It’s optimal to fly from Denver to St. Louis in the evening. By choosing this option you can save up to 30% on the cost of your flight, compared to a flight in the afternoon.

Cheap Delta flights from Denver to St. Louis

Explore cheap flight options specifically provided by Delta for the route between Denver and St. Louis. 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 3,436,117 searches. Data last updated February 22, 2024.
Take a peek at the cheapest Delta flights we've detected traveling from Denver to St. Louis. Make sure to double check the flight details before booking.
Tue 4/1612:45 amDEN - STL
1 stop7h 11mDelta
Tue 4/3010:20 amSTL - DEN
1 stop4h 45mDelta
Deal found 2/22$176
Mon 4/1512:45 amDEN - STL
1 stop7h 11mDelta
Fri 4/263:51 pmSTL - DEN
1 stop6h 28mDelta
Deal found 2/21$187
Mon 4/16:20 pmDEN - STL
1 stop5h 30mDelta
Wed 4/310:20 amSTL - DEN
1 stop4h 50mDelta
Deal found 2/21$213
Tue 3/512:59 amDEN - STL
1 stop7h 04mDelta
Wed 3/1310:20 amSTL - DEN
1 stop4h 50mDelta
Deal found 2/21$217
Fri 4/1912:45 amDEN - STL
1 stop7h 11mDelta
Sun 4/216:13 amSTL - DEN
1 stop5h 06mDelta
Deal found 2/22$222
Tue 4/212:59 amDEN - STL
1 stop6h 55mDelta
Wed 4/106:04 amSTL - DEN
1 stop7h 44mDelta
Deal found 2/21$233
Thu 3/215:42 pmDEN - STL
1 stop4h 50mDelta
Thu 3/2811:59 amSTL - DEN
1 stop8h 14mDelta
Deal found 2/22$237
Thu 2/2912:59 amDEN - STL
1 stop7h 04mDelta
Sat 3/24:00 pmSTL - DEN
1 stop5h 09mDelta
Deal found 2/22$318
Tue 2/2712:59 amDEN - STL
1 stop7h 04mDelta
Fri 3/16:00 amSTL - DEN
1 stop6h 41mDelta
Deal found 2/22$632

Cheap Alaska Airlines flights from Denver to St. Louis

Explore cheap flight options specifically provided by Alaska Airlines for the route between Denver and St. Louis. 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 3,436,117 searches. Data last updated February 22, 2024.
Some of the best deals we've found on Alaska Airlines flights traveling from Denver to St. Louis. Ensure the flight price, dates, time, and airline match your criteria before you book.
Fri 3/17:59 pmDEN - STL
2 stops16h 22mAlaska Airlines
Mon 3/47:00 amSTL - DEN
2 stops12h 59mAlaska Airlines
Deal found 2/22$594
Thu 2/297:59 pmDEN - STL
2 stops26h 59mAlaska Airlines
Thu 3/72:21 pmSTL - DEN
2 stops29h 38mAlaska Airlines
Deal found 2/22$644
Sun 3/37:59 pmDEN - STL
2 stops16h 22mAlaska Airlines
Tue 3/57:00 amSTL - DEN
1 stop8h 25mAlaska Airlines
Deal found 2/21$668
Wed 2/287:59 pmDEN - STL
2 stops16h 22mAlaska Airlines
Sat 3/27:00 amSTL - DEN
2 stops12h 59mAlaska Airlines
Deal found 2/21$693
Tue 2/277:59 pmDEN - STL
2 stops16h 22mAlaska Airlines
Mon 3/257:00 amSTL - DEN
2 stops14h 30mAlaska Airlines
Deal found 2/22$725
Fri 3/13:25 pmDEN - STL
2 stops16h 29mAlaska Airlines
Sat 3/211:30 amSTL - DEN
2 stops32h 29mAlaska Airlines
Deal found 2/22$833

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

Find cheap flight options from Denver to St. Louis specifically for the months of February and March 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,436,117 searches. Prices were last updated on February 22, 2024.
These are some of the best deals we've found on flights to St. Louis in 2024 at this time. Check back regularly for other flight deals.
Wed 3/65:50 amDEN - STL
Nonstop2h 10mFrontier
Wed 3/138:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$78
Wed 3/610:52 pmDEN - STL
1 stop10h 31mFrontier
Wed 3/138:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$88
Sat 3/307:30 amDEN - STL
Nonstop2h 12mFrontier
Mon 4/18:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$94
Thu 3/77:17 pmDEN - STL
Nonstop2h 08mFrontier
Wed 3/138:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/22$98
Fri 3/296:55 amDEN - STL
Nonstop2h 17mFrontier
Fri 4/56:18 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$104
Thu 3/217:07 pmDEN - STL
Nonstop2h 08mFrontier
Thu 3/2811:15 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/20$108
Mon 3/45:50 amDEN - STL
Nonstop2h 10mFrontier
Mon 3/118:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$118
Sun 3/35:50 amDEN - STL
Nonstop2h 10mFrontier
Wed 3/68:14 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/20$119
Tue 3/126:05 pmDEN - STL
Nonstop2h 09mFrontier
Sun 3/1711:15 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/22$128

Denver to St. Louis 2024 flight deals

Discover exclusive flight deals for travel between Denver and St. Louis in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,436,117 searches. Data last updated February 22, 2024.
These are some of the best deals we've found on flights to St. Louis in 2024 at this time. Check back regularly for other flight deals.
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/21$38
Tue 4/2312:45 pmDEN - STL
Nonstop2h 05mFrontier
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/21$40
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/22$48
Sat 4/136:41 amDEN - STL
Nonstop2h 06mFrontier
Tue 4/164:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/21$55
Wed 4/36:55 amDEN - STL
Nonstop2h 17mFrontier
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/21$58
Tue 4/96:05 pmDEN - STL
Nonstop2h 09mFrontier
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/20$65
Thu 4/187:10 amDEN - STL
Nonstop2h 08mFrontier
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/22$68
Thu 4/47:07 pmDEN - STL
Nonstop2h 08mFrontier
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/22$74
Wed 3/65:50 amDEN - STL
Nonstop2h 10mFrontier
Wed 3/138:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$78

Non-stop flights to St. Louis from Denver

Discover non-stop flight options from Denver to St. Louis. 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 3,436,117 searches. Data last updated February 22, 2024.
For a shorter flight, select one of these non-stop flights from Denver to St. Louis. Users can also choose from other Denver to St. Louis flights by using the search form above.
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/21$38
Tue 4/2312:45 pmDEN - STL
Nonstop2h 05mFrontier
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/21$40
Wed 4/176:41 amDEN - STL
Nonstop2h 06mFrontier
Tue 4/304:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/22$48
Sat 4/136:41 amDEN - STL
Nonstop2h 06mFrontier
Tue 4/164:50 pmSTL - DEN
Nonstop2h 30mFrontier
Deal found 2/21$55
Wed 4/36:55 amDEN - STL
Nonstop2h 17mFrontier
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/21$58
Tue 4/96:05 pmDEN - STL
Nonstop2h 09mFrontier
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/20$65
Thu 4/187:10 amDEN - STL
Nonstop2h 08mFrontier
Sat 4/208:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/22$68
Thu 4/47:07 pmDEN - STL
Nonstop2h 08mFrontier
Wed 4/108:04 pmSTL - DEN
Nonstop2h 31mFrontier
Deal found 2/22$74
Wed 3/65:50 amDEN - STL
Nonstop2h 10mFrontier
Wed 3/138:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$78

Denver to St. Louis flights leaving soon

Find last-minute flight options from Denver to St. Louis 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 3,436,117 searches. Data last updated February 22, 2024.
Have a look at some of the last-minute flights available departing from Denver to St. Louis. It's wise to confirm all flight details are correct before booking.
Thu 2/295:45 amDEN - STL
Nonstop2h 10mFrontier
Mon 3/48:12 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/21$118
Sun 3/35:50 amDEN - STL
Nonstop2h 10mFrontier
Wed 3/68:14 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/20$119
Fri 3/15:50 amDEN - STL
Nonstop2h 10mFrontier
Mon 3/48:12 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/21$139
Fri 3/15:50 amDEN - STL
Nonstop2h 10mFrontier
Sun 3/38:14 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/20$160
Sun 3/312:29 amDEN - STL
1 stop30h 18mFrontier
Mon 3/118:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/21$168
Sat 3/212:55 amDEN - STL
1 stop29h 52mFrontier
Wed 3/68:14 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/20$174
Sat 3/212:55 amDEN - STL
1 stop29h 52mFrontier
Tue 3/58:14 pmSTL - DEN
Nonstop2h 35mFrontier
Deal found 2/21$175
Tue 2/271:14 pmDEN - STL
1 stop6h 57mFrontier
Mon 3/258:45 pmSTL - DEN
Nonstop2h 32mFrontier
Deal found 2/22$178
Fri 3/15:50 amDEN - STL
Nonstop2h 10mFrontier
Mon 3/412:13 pmSTL - DEN
1 stop13h 46mFrontier
Deal found 2/21$179

One-way flights to St. Louis from Denver

Search for one-way flight options from Denver to St. Louis. 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 3,436,117 searches. Data last updated February 22, 2024.
Some of the best available deals we've found on one-way flights from Denver to St. Louis. Users in need of a round-trip flight from Denver to St. Louis instead should update the search form at the top of page.
Wed 5/86:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 2/21$27
Sat 4/276:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 2/21$29
Wed 3/65:50 amDEN - STL
Nonstop2h 10mFrontier
Deal found 2/22$39
Mon 4/226:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 2/21$44
Mon 4/226:41 amDEN - STL
Nonstop2h 06mFrontier
Deal found 2/22$45
Mon 3/256:55 amDEN - STL
Nonstop2h 17mFrontier
Deal found 2/21$49
Thu 3/147:07 pmDEN - STL
Nonstop2h 08mFrontier
Deal found 2/21$54
Wed 3/610:52 pmDEN - STL
1 stop10h 31mFrontier
Deal found 2/21$55
Thu 2/295:45 amDEN - STL
Nonstop2h 10mFrontier
Deal found 2/21$59

Find flights from Denver to St. Louis within your budget

Customize your flight search to find flights from Denver to St. Louis 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 3,436,117 searches. Data last updated February 22, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$38 - $176

Route

Depart

Return

Price

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Wed 4/17

Nonstop2h 06m

Lambert-St Louis

Tue 4/30

Nonstop2h 30m

$38

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Tue 4/23

Nonstop2h 05m

Lambert-St Louis

Tue 4/30

Nonstop2h 30m

$40

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Wed 4/17

Nonstop2h 06m

Lambert-St Louis

Tue 4/30

Nonstop2h 30m

$48

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Sat 4/13

Nonstop2h 06m

Lambert-St Louis

Tue 4/16

Nonstop2h 30m

$55

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Wed 4/3

Nonstop2h 17m

Lambert-St Louis

Wed 4/10

Nonstop2h 31m

$58

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Wed 4/17

Nonstop2h 06m

Lambert-St Louis

Mon 4/22

Nonstop2h 31m

$64

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Tue 4/9

Nonstop2h 09m

Lambert-St Louis

Sat 4/20

Nonstop2h 31m

$65

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Mon 5/6

1 stop12h 23m

Lambert-St Louis

Wed 5/8

Nonstop2h 31m

$101

Denver IntlLambert-St Louis

DEN - STL

DENSTL

Denver Intl

Tue 4/16

1 stop7h 11m

Lambert-St Louis

Tue 4/30

1 stop4h 45m

$176

Flights are sorted by cheapest first

Deals found on 2/21

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

Use this chart to determine the optimal time to book a round-trip flight from Denver to St. Louis. Price data was last updated on January 28, 2024.
The price you pay for your flight from Denver to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 54 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Search Deals

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

Use this chart to determine the cheapest time to fly round-trip from Denver to St. Louis. Price data was last updated on February 18, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Denver to St. Louis flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday 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 St. Louis by month

Plan your trip from Denver to St. Louis by taking into account the cheapest months to travel. The average price of a one-way flight from Denver to St. Louis is currently $45 while a round-trip flight costs $72. Price data was last updated on February 18, 2024.

Currently, October is the cheapest month in which you can book a flight from Denver to St. Louis (average of $323). Flying from Denver to St. Louis in June is currently the most expensive (average of $389). 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

$326

February

$330

March

$346

April

$361

May

$361

June

$389

July

$383

August

$338

September

$324

October

$323

November

$335

December

$323

Temperature and rainfall in St. Louis by month

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

STL

Temperature

32 - 80.6 °F

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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. Louis. Reviews last updated February 22, 2024.
Get a feel of what it's like to fly with Delta, Alaska Airlines and Frontier from Denver to St. Louis by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
8.1
Very good
11,921 reviews

Comfort

7.9

Boarding

8.2

Food

7.5

Overall

8.1

Crew

8.6

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

8.1
Very good
11,921 reviews
8.1
Very good
11,921 reviews

Comfort

7.9

Boarding

8.2

Food

7.5

Overall

8.1

Crew

8.6

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.4
Good
11,872 reviews
8.1
Very good
11,921 reviews

Comfort

7.9

Boarding

8.2

Food

7.5

Overall

8.1

Crew

8.6

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.3
Good
15,643 reviews
8.1
Very good
11,921 reviews

Comfort

7.9

Boarding

8.2

Food

7.5

Overall

8.1

Crew

8.6

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

7.3
Good
733 reviews
8.1
Very good
11,921 reviews

Comfort

7.9

Boarding

8.2

Food

7.5

Overall

8.1

Crew

8.6

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

6.4
Okay
4,512 reviews
8.1
Very good
11,921 reviews

Comfort

7.9

Boarding

8.2

Food

7.5

Overall

8.1

Crew

8.6

Entertainment

8.1

Reviews

1 / 10

It was a good experience other than a short delay.

Related info for your journey

Find useful and relevant information for your journey from Denver to St. Louis. 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 Denver to St. Louis?

To fly from Denver to St. Louis, you need to book a flight from Denver Intl (DEN) to Lambert-St Louis (STL). Nonstop flights to Lambert-St Louis from Denver Intl take 2h 03m on average. When it comes time to book airfare, you have a few options: there are 20 outbound flights from Denver Intl to Lambert-St Louis offered by 3 different airlines.

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

Yes, there are multiple flights from Denver to St. Louis for under $100. The cheapest flight booked recently is on Frontier for just $38, but on average you can expect to pay $78.

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

Cheapflights has at least 20 direct flights from Denver to St. Louis under $100. A good price for a nonstop flight from Denver to St. Louis is less than $84.

Are there last-minute flights available from Denver to St. Louis for under $200?

There are currently 20+ open flights from Denver to St. Louis within the next 7 days for less than $200.

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

Nonstop flights are available for this route on the following days: Monday.

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

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

On average 2 flights depart from Denver to St. Louis per day.
Evening (6pm - Midnight) - 100% of flight departures

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

A quick flight from Denver to St. Louis can take about 2h 06m. Frontier provides one of the quickest options available for as low as $38. The distance from Denver to St. Louis is about 772 mi. Most flights are nonstop.

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

Our cheapest airline available from Denver to St. Louis is Frontier. Our recent data shows that you can find tickets from as low as $38 on this airline. Frontier is currently priced 76% below the average price you’ll pay for this route.

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

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $27. Users have also found prices from $87 and $98 on American Airlines and Sun Country Air, respectively.

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

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

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Denver to St. Louis on time: Frontier (90%), Air Canada (79%), United Airlines (72%).

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

While on average a flight from Denver to St. Louis is generally $273, our data shows the cheapest flight currently is $46. When looking at the most popular route, (Denver Intl - Lambert-St Louis), you can expect to pay $101 for that flight.

What does DEN to STL mean?

Denver Intl Airport is DEN and Lambert-St Louis Airport is STL. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

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 3 airlines flying from Denver to St. Louis

Discover the top 3 airlines that operate flights from Denver to St. Louis. 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 3,436,117 searches. Data last updated February 22, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$53Average$130FlexibilityNo cancel feeOn-time62%
Search Frontier flights
United AirlinesCheapest$115Average$309FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$296Average$499FlexibilityNo cancel feeOn-time71%
Search American Airlines flights