Find flights
Deals
Insights
When to book
FAQs & Tips
Direct Flights
Airlines

DEN - STL

$35 Find cheap flights from Denver to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to St. Louis departing on 5/25. 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.
1 adult
0 bags
Tue 6/4
Tue 6/11

Search hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to St. Louis, as well as popular online travel agencies
In the last 7 days travelers have searched 42,830,901 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

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

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Denver to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
6:26 am - 9:36 amDEN-STL
2h 10mnonstop
10:44 pm - 12:20 amSTL-DEN
2h 36mnonstop
$63Frontier
Find Deal
Wed, May 29 - Tue, Jun 4
10:00 am - 1:09 pmDEN-STL
2h 09mnonstop
8:04 pm - 9:35 pmSTL-DEN
2h 31mnonstop
$70Frontier
Find Deal
Tue, May 21 - Sat, May 25
10:50 am - 12:33 pmDEN-STL
24h 43m1 stop
8:02 pm - 9:32 pmSTL-DEN
2h 30mnonstop
Sat, Jun 1 - Sat, Jun 8
6:20 pm - 5:22 pmDEN-STL
22h 02m1 stop
8:00 pm - 9:28 pmSTL-DEN
2h 28mnonstop
Thu, Aug 8 - Sat, Aug 10
3:03 pm - 9:24 pmDEN-STL
5h 21m1 stop
3:05 pm - 7:49 pmSTL-DEN
5h 44m1 stop
$192Delta
Find Deal
Sat, Jun 1 - Wed, Jun 5
11:59 pm - 9:53 amDEN-STL
8h 54m1 stop
7:20 pm - 11:02 pmSTL-DEN
4h 42m1 stop
$206American Airlines
Find Deal
Wed, May 29 - Mon, Jun 3
8:45 am - 5:45 pmDEN-STL
8h 00m1 stop
5:30 pm - 11:14 pmSTL-DEN
6h 44m1 stop
$212Delta
Find Deal
Thu, May 30 - Tue, Jun 4
1:48 pm - 11:23 pmDEN-STL
8h 35m1 stop
9:09 am - 3:27 pmSTL-DEN
7h 18m1 stop
$220American Airlines
Find Deal
Fri, Aug 23 - Wed, Aug 28
6:20 pm - 12:41 pmDEN-STL
17h 21m1 stop
6:30 am - 7:36 pmSTL-DEN
14h 06m1 stop
$225Sun Country Air
Find Deal
Thu, Jun 13 - Sun, Jun 16
7:30 pm - 8:30 pmDEN-STL
24h 00m1 stop
6:20 pm - 9:00 amSTL-DEN
15h 40m1 stop
$227Sun Country Air
Find Deal
Fri, May 24 - Sun, May 26

Flights from Denver to St. Louis - Travel Insights & Trends

Get data-powered insights and trends into flights from Denver to St. Louis to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Denver to St. Louis?

The average price of all flights from Denver to St. Louis clicked on KAYAK for each day over the last 12 months.
For Denver to St. Louis, Wednesday is the cheapest day to fly on average and Monday is the most expensive. Flying from St. Louis back to Denver, the best deals are generally found on Tuesday, with Monday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Denver to St. Louis, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Denver to St. Louis is February, where tickets cost $127 on average. On the other hand, the most expensive months are December and March, where the average cost of tickets is $250 and $208 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Denver to St. Louis, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Denver to St. Louis, you should book around 5 days before departure. For the absolute cheapest price, our data suggests you should book 54 days before departure.

Which airlines provide the cheapest flights from Denver to St. Louis?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the past 3 days, the cheapest one-way tickets to St. Louis from Denver were found on Frontier ($35) and Delta ($88), and the lowest round-trip tickets were found on Frontier ($63) and Delta ($192).

Which airlines fly most frequently between Denver and St. Louis?

Southwest (9 flights per day), United Airlines (4 flights per day), and Frontier (one flight per day) are the most frequent flyers of this route.

Which airlines fly non-stop between Denver and St. Louis?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Denver to St. Louis.
There are 3 airlines that fly nonstop from Denver to St. Louis. They are: Frontier, Southwest and United Airlines. The cheapest price of all airlines flying this route was found with Frontier at $49 for a one-way flight. On average, the best prices for this route can be found at Frontier.

How many flights are there between Denver and St. Louis per day?

Each day, there are between 11 and 21 nonstop flights that take off from Denver and land in St. Louis, with an average flight time of 2h 03m. The most common departure time is 6:00 am and most flights take off in the morning. Each week, there are 103 flights. The most frequent day of departure is Wednesday, when 20% of all weekly flights depart. The fewest flights depart on a Saturday.

Which cabin class options are there for flights between Denver and St. Louis?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from Denver to St. Louis take?

A direct flight to St. Louis will take on average 2h 07m to travel the 767 miles flying distance from Denver.

What’s the earliest departure time from Denver to St. Louis?

Early birds can take the earliest flight from Denver at 5:45 am and will be landing in St. Louis at 8:45 am.

What’s the latest departure time from Denver to St. Louis?

If you prefer to fly at night, the latest flight from Denver to St. Louis jets off at 10:15 pm and lands at 1:15 am.

Good to know

Low season

January

High season

November

Cheapest flight

$35
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 9% increase in price.
Flight from Denver to St. Louis

When to book flights from Denver to St. Louis

Are your dates flexible? Find out the best times to travel from Denver to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Denver to St. Louis

  • Can I fly nonstop from Denver International Airport (DEN) to Lambert St Louis Airport (STL)?

    Yes, direct flights exist between Denver International Airport and Lambert St. Louis Airport. Multiple carriers, like Southwest Airlines and United Airlines, provide direct flights from DEN to Lambert Airport if you want to reach your destination quickly.

  • Is there public transportation to downtown from Lambert St Louis Airport?

    Yes, there is public transportation from Lambert St Louis to downtown. There are multiple options such as train, bus, or even taxi. Services run daily and leave every 20min. The travel time is roughly 30min.

  • Are there hotels at Lambert St Louis?

    Yes, there are quite a few hotel alternatives at and in close proximity to Lambert International Airport in St. Louis, including Hampton Inn St. Louis Airport and the Comfort Inn & Suites St. Louis-Hazelwood.

  • How can I get from one terminal to the other?

    STL Airport has a free 24h Terminal Shuttle that operates between Exit 12 at both terminals. There is currently no way to walk between terminals. Terminal 1 and Terminal 2 are less than one mile apart, thus the shuttle trip duration is roughly 10min. Every 8 to 15min, shuttles are scheduled to pick up passengers.

  • What is the cheapest flight from Denver to St. Louis?

    In the last 3 days, the lowest price for a flight from Denver to St. Louis was $35 for a one-way ticket and $63 for a round-trip.

  • Do I need a passport to fly between Denver and St. Louis?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airlines offer Wi-Fi service onboard planes from Denver to St. Louis?

    American Airlines, and Delta offer inflight Wi-Fi service on the Denver to St. Louis flight route.

  • Which aircraft models fly most regularly from Denver to St. Louis?

    The Airbus A320-100/200 is the aircraft model that flies most regularly on the Denver to St. Louis flight route.

  • Which airline alliances offer flights from Denver to St. Louis?

    Star Alliance is the only airline alliance operating flights between Denver and St. Louis.

  • On which days can I fly direct from Denver to St. Louis?

    There are nonstop flights from Denver to St. Louis on a daily basis.

  • Which is the best airline for flights from Denver to St. Louis, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from Denver to St. Louis are United Airlines and American Airlines. With an average price for the route of $299 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $336 and an overall rating of 7.3.

  • How does KAYAK find such low prices on flights from Denver to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Denver is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Denver with another airline. Booking your flights between Denver and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding a cheap flight from DEN to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $64 or less one-way and $99 or less round-trip.
  • Utilize the offered lounges at the departure and arrival airports. There are about six lounges at Denver International Airport (DEN) and a number of lounges at Lambert St. Louis (STL) that provide free food, drinks, showers, and high-speed Wi-Fi, among other services.
  • If you are departing from Denver International Airport (DEN) and need parking, there are numerous alternatives. You may use Valet Parking, which offers the best prices and reservations or choose one of the indoor or outdoor self-parking choices. They offer a range of amenities, including 24h staff and shuttles, wider, angled parking, free EV charging, and free roses.
  • When flying out of Denver International Airport, it is suggested that you arrive at the airport 2h before your flight's scheduled departure time. This should provide you with plenty of time to check-in for your flight, go through security, and make your way to your gate. If you visit the DEN website before you leave, you will be able to observe the wait times for the security lines in real-time, which will allow you to better prepare for your trip. Every single security checkpoint inside the DEN is always open and performing appropriately.
  • Free assistance for passengers traveling with wheelchairs is offered by airlines at both Denver International Airport (DEN) and Lambert St. Louis Airport (STL). Travelers with limited mobility or elderly passengers may find this to be of great assistance. Contacting the airline in advance to request a passenger help agent will get you the finest possible accommodations.
  • If you need to convert money at Lambert St Louis, go to the lower level of Terminal 1 and find the currency exchange counter near the C Gates security checkpoint. US Bank has a branch at the airport that provides comprehensive banking services as well as a currency exchange for international travelers. The business is open from Monday through Friday, starting at 8 am and closing at 5 pm.
See more tips

Prefer to fly non-stop from Denver to St. Louis?

Find which airlines fly direct from Denver Intl to Lambert-St Louis, which days they fly and book direct flights.

Nonstop departures

Denver Intl to Lambert-St Louis

Monday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Tuesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Wednesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Thursday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Friday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Saturday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Sunday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

See more direct flights

Nonstop returns

Lambert-St Louis to Denver Intl

Monday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Tuesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Wednesday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Thursday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Friday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Saturday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

Sunday

Air Canada, Frontier, Southwest, +1 more

Air Canada, Frontier, +2 more

See more direct flights
See more direct flights

Top 3 airlines serving from Denver to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Denver to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 11118 reviews
7.7Boarding
7.1Entertainment
7.2Comfort
6.7Food
8.1Crew
Airline reviews

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

8.0 ExcellentKeith, May 2024DEN - FAT
Read more about United Airlines reviews

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Last minute gate change nearly caused us to miss our flight. Change was not announced or displayed in the main board at the old gate. Terrible communication. When we landed we had to wait 20 minutes because there was another plane at the assigned gate. Not the crew’s fault, but adding 20 minutes to a 45 minute flight sucked.

Flight delayed from Cape Town to Washington then got diverted to miami and in miami we had to fend for ourselves , im still trying to get to Shreveport now

I just wrote a text which was supposed to be for the flight from Denver to spokane not Frankfurt to Denver.

Too many fees (but that seems to apply to all airlines nowadays)

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

Everything was very good. Boarding and takeoff were on time and organized. Had a good flight

Wheelchair assistance was not complete. The person left me at the departure gate without informing the groundstaff of my requirements. I had to walk to the departure counter to ask for help to reach the plane door. The crew informed me that in future they were not allowed to help passengers like me, senior citizen and Wheelchair passenger with placing their carry on bags in the overhead compartments!

Flight was delayed by over an hour and gate checked bags took 15 minutes to be delivered to the jet bridge.

Seats are way too snug for my hip to knee ratio and the recline on the seat in front of me made my experience worst. My legs had no room at all. Not a plane for people 6 ft or over unless you fly first class.

Great crew. We were delayed so that late passengers could get on the flight. Love the bedding in business class. Good food. Great experience.

The CX617 from HK to BKK was delayed more than 1.5 hours.

Horrible - they lied to me about baggage & boarding, even though I specifically spoke to their agents the day before my flight about my issue. When I showed up they did not let me board and stranded me at my airport until I bought a new flight with money I did not have to spend.

All four American Airlines flights I took in last seven days were delayed. Caused me loads of problems, missed meetings, loss of time and money.

American cancelled our flight home. Zero option for hotel, alternative transportation and took 3 hours to find our bags so we could take a 3 hour UBER ride home on our dime. Never flying AA again.

They gave my seat away although it was a connecting flight with them and the flight was a bit delayed.

Flight was cancelled had to move to another gate late again no internet paid for the month and never can use it waste of money

Not being able to purchase my check in baggage online was a negative.

LATE LATE LATE!!! Plagued by late AA flights on this trip. Such a drag. This one was by far the worst.

WiFi connected but only let you go to the AA website, not even text messaging worked.

Not good 😐 Over priced baggage fees Small hard seats No wifi or entertainment options 😕

Left Denver late, then sat on tarmac 30 min after arrival

Everything was good, 20/30 minutes late waiting on a crew member. It’s hard to keep employees. Or serious employees I know. I remember one flight from Houston of Frontiers was almost 18 hours late. And another 4 hours late very poor. But I would rather be late and safe than the on the news. Thank you.

Bought seats on the flight and they were supposed to be 2 and a jumpseat. Plane clearly changed and it was a regular 3 seat row. Asked for a refund and was denied. If I wanted to sit next to someone else I wouldn't have bought the seats..

Lost baggage on my connecting flight. 24 hours later, still no update on my bags.

It’s a cheap airline and I wish if they had better seats.

Seats are cramped and uncomfortable. You have to pay for everything and it is very expensive.

The experience was terrible. The flight boarded late, then after leaving the gate the plane had had to return to the gate for fuel. After 2 hours on the plane, the flight was canceled. The reasons given for the cancelation didn't sound truthful. and different reasons were given. My 15 year old daughter was flying alone on this flight. When they all disembarked the plane she kept asking the crew what she was supposed to do. No one even gave her the courtesy of a response. No one. It took another 4.75 hrs to be out of customs and baggage. She was re-booked the following day. That flight departed 2 hours late. After all of that, they offered a measly $100 flight voucher with an expiry date of 3 months! All in all a terrible experience. We won't be using Frontier again in the future.

For a busy travel season, everything was clearly marked, correct, and smooth. My favorite travel description is “UNEVENTFUL,” and this trip met the mark!

The flight and crew were fine. When we (several groups) arrived in Norfolk on Sunday we discovered our bags had not arrived. The staff at norfolk airport was less than helpful. Told us our bags wouldn't arrive until Thursday. When asked what happened they said it bags never made it on the plane and it happened all the time. When asked about reimbursement for replacement items the desk agent said we could try to submit receipts online, but they weren't sure we would be reimbursed. I understand this is a low cost airline, but this was really beyond poor customer service.

Book cheap flights from Denver to St. Louis

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Denver to St. Louis found on KAYAK in the last 72 hours.
5/25Sat
nonstopFrontier
2h 10mDEN-STL
$35
8/6Tue
nonstopFrontier
2h 06mDEN-STL
$45
6/3Mon
1 stopDelta
7h 35mDEN-STL
$88
7/4Thu
1 stopSun Country Air
14h 39mDEN-STL
$91
5/25Sat
1 stopSun Country Air
22h 20mDEN-STL
$98
7/3Wed
1 stopAmerican Airlines
7h 34mDEN-STL
$103
6/3Mon
1 stopAmerican Airlines
5h 01mDEN-STL
$104
6/7Fri
1 stopDelta
7h 45mDEN-STL
$124
5/25Sat
2 stopsUnited Airlines
21h 36mDEN-STL
$198
7/9Tue
2 stopsUnited Airlines
11h 02mDEN-STL
$258

Search by stops

Search by airline

Search by price

Last minute flights from Denver to St. Louis

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Denver to St. Louis that are departing in the next 10 days.
5/10Fri
nonstopFrontier
2h 06mDEN-STL
5/12Sun
nonstopFrontier
2h 33mSTL-DEN
$212
5/9Thu
multi-stopFrontier
11h 14mDEN-STL
5/14Tue
nonstopFrontier
2h 30mSTL-DEN
$224
5/10Fri
multi-stopDelta
7h 35mDEN-STL
5/20Mon
multi-stopDelta
5h 24mSTL-DEN
$298
5/10Fri
multi-stopDelta
7h 35mDEN-STL
5/13Mon
multi-stopDelta
5h 24mSTL-DEN
$328
5/8Wed
multi-stopAmerican Airlines
7h 44mDEN-STL
5/21Tue
multi-stopAmerican Airlines
7h 46mSTL-DEN
$377
5/9Thu
multi-stopAmerican Airlines
7h 44mDEN-STL
5/11Sat
multi-stopAmerican Airlines
8h 48mSTL-DEN
$382
5/9Thu
multi-stopUnited Airlines
6h 16mDEN-STL
5/20Mon
nonstopUnited Airlines
2h 22mSTL-DEN
$462
5/9Thu
multi-stopUnited Airlines
6h 56mDEN-STL
5/11Sat
nonstopUnited Airlines
2h 27mSTL-DEN
$477
5/9Thu
multi-stop
19h 54mDEN-STL
5/14Tue
multi-stop
27h 20mSTL-DEN
$489
5/9Thu
multi-stop
20h 10mDEN-STL
5/14Tue
multi-stop
33h 40mSTL-DEN
$555

Search by stops

Search by airline

Search by price

Denver - St. Louis Flights

Departure:

Denver (DEN)United States

Destination:

St. Louis (STL)United States

Return flight deals:

St. Louis - Denver

Cabin classes:

$674
$392
$470
$50