Find Cheap Flights from Denver International to Lambert-St Louis (DEN - STL)

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Fri 2/23
Fri 3/2
Any month
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Good to Know

Low Season:
February
Best time to beat the crowds
2%
expected price decrease
High Season:
October
Most popular time to fly
8%
expected price increase
Average Price:
$385
(avg. price over the last 2 weeks)
Good Deal:
$385
or less (round trip)

When to Book Flights from Denver International to Lambert-St Louis

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

The cheapest flight from Denver International to Lambert-St Louis was found 27 days before departure, on average.
Book at least 2 weeks before departure in order to get a below-average price.
High season is considered to be September, October and November. The cheapest month to fly is February.
Morning departure is around 10% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Denver International to Lambert-St Louis Flights

How long does a flight from Denver International to Lambert-St Louis take?
An average nonstop flight takes 2h 00m, covering a distance of 768 miles.
How many flights are there between Denver International and Lambert-St Louis?
There are 254 (nonstop) flights between Denver International and Lambert-St Louis per week, averaging 38 per day.
Which airlines provide the cheapest flights from Denver International to Lambert-St Louis?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($117), United ($151) and Multiple Airlines ($151).
Do I need a passport to fly between Denver International and Lambert-St Louis?
No.
Which airlines fly most frequently between Denver International and Lambert-St Louis?
United (12 times daily), Southwest (11 times daily), Air Canada (10 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Denver International to Lambert-St Louis?
For Denver International to Lambert-St Louis, Wednesday is the cheapest day to fly on average and Tuesday is the most expensive. Flying from Lambert-St Louis back to Denver International, the best deals are generally found on Tuesday, with Sunday being the most expensive.

Book cheap flights from Denver International to Lambert-St Louis (round-trip)

Airports
Origin
Denver
$117
only
$117
Destination
St. Louis
$117
only
$117
Wed, Feb 28
DEN
STL
2h 03m
Wed, Mar 7
STL
DEN
2h 28m
Trip: 8 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Mediocre 3.0

The flight was 2 hours delayed, uncomfortable, the loudspeaker was TOO loud, and nothing was free. The only good thing was the price...which isn't always enough.

DEN
STL
Okay 4.0

Same as above

DEN
STL
Mediocre 2.0

Flight time was changed, and I wasn't notified, so I missed the flight.

DEN
STL
Good 6.5

The tickets look like a deal until they charge for every other thing. The information regarding what bag can be carried on without a fee is very confusing. We paid and then saw people rolling cases and putting them in the overhead bin. The seat prices are ridiculous so you don't want to pay for a seat they will assign you for free, I was then told I had to go to the gate to get a seat assignment even though I had already purchased a ticket. I waited for almost an hour before someone showed up. I was told the only seats left were the exit rows. Luckily I am healthy. If I have paid for a ticket Frontier should guarantee me a seat. We had to wait in line even though we had already paid for our bags and some of us went on line and checked in and had boarding passes. Where is the short cut then?? It was so convoluted we will never fly Frontier again. Too much work, let me pay for the ticket and let me have a bag and give me a seat for crying out loud. The flight crew was great. Very nice.

DEN
STL
Excellent 8.0

Breckinridge whiskey

Bit cramped

Tue, Feb 27
DEN
STL
2h 00m
Wed, Feb 28
STL
DEN
2h 29m
Trip: 2 days
6.9GoodShow reviews
Overall 6.9 Good
Based on 30 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
STL
Excellent 10.0

Crew is very polite and helpful. Boarding was quick and painless. Overall very pleased with experience.

DEN
STL
Excellent 10.0

newer plane. more personal space per seat

DEN
STL
Mediocre 2.0

Nothing

Delayed 2 hours because they had to change tires they didn't decide that until everyone was already on the plane then had to deboard counter people were very rude this airline is always delayed for something probably the worst airline ever

DEN
STL
Okay 5.3

Flight was ok

It was late

DEN
STL
Excellent 10.0

Same as above. Did notice the woman staffing the counter at boarding having extreme patience with people's problems and non problems. She was great and deserves a raise. Denver gate B 85 between 1:00 and 3:00 6/15/16.

Thu, Mar 8
DEN
STL
2h 08m
Tue, Mar 13
STL
DEN
2h 34m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Mar 3
DEN
STL
2h 10m
Wed, Mar 7
STL
DEN
2h 28m
Trip: 5 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Okay 4.0

Almost. 8 hour delay, and was never told real reason. Was offered $10 lunch, and nothing else. I had to change my vacation plans because of delay! Not a happy customer!!!!

DEN
STL
Good 6.0

seats are worn out, you have to pay to place a bag in overhead compartments

DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

DEN
STL
Mediocre 3.0

Disorganization with boarding process. Gate changes from that which was indicated on boarding pass, without notification. Expensive baggage/fees. No basic complimentary accommodations (snacks). Uncomfortable seats lacking ergonomic design and headrest. Small spaces for personal items.

DEN
STL
Mediocre 3.0

The flight was 2 hours delayed, uncomfortable, the loudspeaker was TOO loud, and nothing was free. The only good thing was the price...which isn't always enough.

Thu, Mar 8
DEN
STL
2h 08m
Tue, Mar 13
STL
DEN
2h 27m
Trip: 5 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Mediocre 3.0

The flight was 2 hours delayed, uncomfortable, the loudspeaker was TOO loud, and nothing was free. The only good thing was the price...which isn't always enough.

DEN
STL
Okay 4.0

Almost. 8 hour delay, and was never told real reason. Was offered $10 lunch, and nothing else. I had to change my vacation plans because of delay! Not a happy customer!!!!

DEN
STL
Good 6.0

seats are worn out, you have to pay to place a bag in overhead compartments

DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

DEN
STL
Mediocre 3.0

Disorganization with boarding process. Gate changes from that which was indicated on boarding pass, without notification. Expensive baggage/fees. No basic complimentary accommodations (snacks). Uncomfortable seats lacking ergonomic design and headrest. Small spaces for personal items.

Fri, Mar 9
DEN
STL
2h 10m
Tue, Mar 13
STL
DEN
2h 27m
Trip: 4 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Good 6.5

The tickets look like a deal until they charge for every other thing. The information regarding what bag can be carried on without a fee is very confusing. We paid and then saw people rolling cases and putting them in the overhead bin. The seat prices are ridiculous so you don't want to pay for a seat they will assign you for free, I was then told I had to go to the gate to get a seat assignment even though I had already purchased a ticket. I waited for almost an hour before someone showed up. I was told the only seats left were the exit rows. Luckily I am healthy. If I have paid for a ticket Frontier should guarantee me a seat. We had to wait in line even though we had already paid for our bags and some of us went on line and checked in and had boarding passes. Where is the short cut then?? It was so convoluted we will never fly Frontier again. Too much work, let me pay for the ticket and let me have a bag and give me a seat for crying out loud. The flight crew was great. Very nice.

DEN
STL
Mediocre 2.0

Flight time was changed, and I wasn't notified, so I missed the flight.

DEN
STL
Good 6.0

seats are worn out, you have to pay to place a bag in overhead compartments

DEN
STL
Okay 4.0

Same as above

DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

Sun, Mar 11
DEN
STL
2h 08m
Mon, Mar 19
STL
DEN
2h 29m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Apr 14
DEN
STL
2h 12m
Sun, Apr 22
STL
DEN
2h 28m
Trip: 9 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Good 6.5

The tickets look like a deal until they charge for every other thing. The information regarding what bag can be carried on without a fee is very confusing. We paid and then saw people rolling cases and putting them in the overhead bin. The seat prices are ridiculous so you don't want to pay for a seat they will assign you for free, I was then told I had to go to the gate to get a seat assignment even though I had already purchased a ticket. I waited for almost an hour before someone showed up. I was told the only seats left were the exit rows. Luckily I am healthy. If I have paid for a ticket Frontier should guarantee me a seat. We had to wait in line even though we had already paid for our bags and some of us went on line and checked in and had boarding passes. Where is the short cut then?? It was so convoluted we will never fly Frontier again. Too much work, let me pay for the ticket and let me have a bag and give me a seat for crying out loud. The flight crew was great. Very nice.

DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

DEN
STL
Okay 4.0

Almost. 8 hour delay, and was never told real reason. Was offered $10 lunch, and nothing else. I had to change my vacation plans because of delay! Not a happy customer!!!!

DEN
STL
Mediocre 2.0

Flight time was changed, and I wasn't notified, so I missed the flight.

Fri, Apr 6
DEN
STL
2h 10m
Mon, Apr 9
STL
DEN
2h 21m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Apr 15
DEN
STL
2h 12m
Sun, Apr 22
STL
DEN
2h 28m
Trip: 8 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Okay 4.0

Almost. 8 hour delay, and was never told real reason. Was offered $10 lunch, and nothing else. I had to change my vacation plans because of delay! Not a happy customer!!!!

DEN
STL
Okay 4.0

Same as above

DEN
STL
Mediocre 2.0

Unexpected 45$ per carry on. Horseshit

DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

DEN
STL
Mediocre 3.0

Flight was abnormally bumpy to the point even the crew mentioned it. I could hear the crew the whole flight chatting and bitching about Work etc

Thu, Jun 7
DEN
STL
2h 07m
Tue, Jun 12
STL
DEN
2h 20m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Apr 16
DEN
STL
2h 12m
Sun, Apr 22
STL
DEN
2h 28m
Trip: 7 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Mediocre 2.0

Unexpected 45$ per carry on. Horseshit

DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

DEN
STL
Excellent 8.0

Breckinridge whiskey

Bit cramped

DEN
STL
Good 6.0

seats are worn out, you have to pay to place a bag in overhead compartments

Tue, Apr 17
DEN
STL
2h 12m
Sun, Apr 22
STL
DEN
2h 28m
Trip: 6 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Mediocre 3.0

Flight was abnormally bumpy to the point even the crew mentioned it. I could hear the crew the whole flight chatting and bitching about Work etc

DEN
STL
Excellent 8.0

Breckinridge whiskey

Bit cramped

DEN
STL
Good 6.0

seats are worn out, you have to pay to place a bag in overhead compartments

DEN
STL
Mediocre 3.0

Disorganization with boarding process. Gate changes from that which was indicated on boarding pass, without notification. Expensive baggage/fees. No basic complimentary accommodations (snacks). Uncomfortable seats lacking ergonomic design and headrest. Small spaces for personal items.

DEN
STL
Mediocre 2.0

Unexpected 45$ per carry on. Horseshit

Tue, Mar 27
DEN
STL
4h 51m
Fri, Mar 30
STL
DEN
2h 28m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Apr 21
DEN
STL
2h 12m
Sat, Apr 28
STL
DEN
2h 28m
Trip: 8 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Excellent 8.0

Breckinridge whiskey

Bit cramped

DEN
STL
Good 6.5

The tickets look like a deal until they charge for every other thing. The information regarding what bag can be carried on without a fee is very confusing. We paid and then saw people rolling cases and putting them in the overhead bin. The seat prices are ridiculous so you don't want to pay for a seat they will assign you for free, I was then told I had to go to the gate to get a seat assignment even though I had already purchased a ticket. I waited for almost an hour before someone showed up. I was told the only seats left were the exit rows. Luckily I am healthy. If I have paid for a ticket Frontier should guarantee me a seat. We had to wait in line even though we had already paid for our bags and some of us went on line and checked in and had boarding passes. Where is the short cut then?? It was so convoluted we will never fly Frontier again. Too much work, let me pay for the ticket and let me have a bag and give me a seat for crying out loud. The flight crew was great. Very nice.

DEN
STL
Okay 4.0

Almost. 8 hour delay, and was never told real reason. Was offered $10 lunch, and nothing else. I had to change my vacation plans because of delay! Not a happy customer!!!!

DEN
STL
Okay 4.0

Same as above

DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

Sun, Apr 29
DEN
STL
2h 12m
Tue, May 8
STL
DEN
2h 29m
Trip: 10 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

DEN
STL
Mediocre 2.0

Flight time was changed, and I wasn't notified, so I missed the flight.

DEN
STL
Mediocre 3.0

The flight was 2 hours delayed, uncomfortable, the loudspeaker was TOO loud, and nothing was free. The only good thing was the price...which isn't always enough.

DEN
STL
Okay 4.0

Same as above

DEN
STL
Mediocre 3.0

Flight was abnormally bumpy to the point even the crew mentioned it. I could hear the crew the whole flight chatting and bitching about Work etc

Mon, Apr 30
DEN
STL
2h 12m
Tue, May 8
STL
DEN
2h 29m
Trip: 9 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Excellent 8.0

Breckinridge whiskey

Bit cramped

DEN
STL
Mediocre 2.0

Unexpected 45$ per carry on. Horseshit

DEN
STL
Mediocre 2.0

Flight time was changed, and I wasn't notified, so I missed the flight.

DEN
STL
Mediocre 3.0

The flight was 2 hours delayed, uncomfortable, the loudspeaker was TOO loud, and nothing was free. The only good thing was the price...which isn't always enough.

DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

Tue, May 1
DEN
STL
2h 07m
Tue, May 8
STL
DEN
2h 29m
Trip: 8 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Mediocre 2.0

Unexpected 45$ per carry on. Horseshit

DEN
STL
Excellent 8.0

Breckinridge whiskey

Bit cramped

DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

DEN
STL
Okay 4.0

Same as above

DEN
STL
Mediocre 2.0

Flight time was changed, and I wasn't notified, so I missed the flight.

Wed, May 2
DEN
STL
2h 07m
Tue, May 8
STL
DEN
2h 29m
Trip: 7 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Good 6.0

seats are worn out, you have to pay to place a bag in overhead compartments

DEN
STL
Mediocre 3.0

Flight was abnormally bumpy to the point even the crew mentioned it. I could hear the crew the whole flight chatting and bitching about Work etc

DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

DEN
STL
Mediocre 2.0

Flight time was changed, and I wasn't notified, so I missed the flight.

Thu, May 3
DEN
STL
2h 07m
Tue, May 8
STL
DEN
2h 29m
Trip: 6 days
5.5OkayShow reviews
Overall 5.5 Okay
Based on 174 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
STL
Good 7.6

Crew was great! Got to St. Louis on time.

DEN
STL
Mediocre 3.0

The flight was 2 hours delayed, uncomfortable, the loudspeaker was TOO loud, and nothing was free. The only good thing was the price...which isn't always enough.

DEN
STL
Excellent 10.0

the crew was very entertaining which always helps make the trip more pleasant.

Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier.

DEN
STL
Mediocre 3.0

Disorganization with boarding process. Gate changes from that which was indicated on boarding pass, without notification. Expensive baggage/fees. No basic complimentary accommodations (snacks). Uncomfortable seats lacking ergonomic design and headrest. Small spaces for personal items.

DEN
STL
Okay 4.0

Same as above

Show more results

Denver International to Lambert-St Louis Flight Information

Avg. Flight Duration 2h 18m
Flights Arrive in Lambert-St Louis
Flights Depart from Denver International
Flight Price $117
Distance 768 miles
Airlines Frontier, United
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

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At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.