Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from the United States to St. Louis from $35

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to St. Louis departing on 9/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from the United States to St. Louis

Recent round-trip flight deals from the United States to St. Louis

Frontier Logo
6:50 am - 10:02 amDEN-STL
2h 12mnonstop
Frontier Logo
7:43 pm - 9:15 pmSTL-DEN
2h 32mnonstop
$96Frontier
Find Deal
Fri, Dec 5 - Mon, Dec 8
Frontier Logo
6:00 am - 9:07 amDEN-STL
2h 07mnonstop
Frontier Logo
7:45 pm - 9:13 pmSTL-DEN
2h 28mnonstop
$100Frontier
Find Deal
Wed, Nov 12 - Fri, Nov 14
United Airlines Logo
8:45 pm - 11:58 pmDEN-STL
2h 13mnonstop
United Airlines Logo
1:40 pm - 3:00 pmSTL-DEN
2h 20mnonstop
$131United Airlines
Find Deal
Fri, Oct 10 - Tue, Oct 14
American Airlines Logo
7:00 am - 8:53 amDFW-STL
1h 53mnonstop
American Airlines Logo
8:49 am - 10:46 amSTL-DFW
1h 57mnonstop
$139American Airlines
Find Deal
Sat, Oct 25 - Tue, Oct 28
American Airlines Logo
6:59 pm - 8:53 pmDFW-STL
1h 54mnonstop
American Airlines Logo
5:58 pm - 8:05 pmSTL-DFW
2h 07mnonstop
$140American Airlines
Find Deal
Tue, Oct 28 - Tue, Nov 4
United Airlines Logo
8:45 pm - 11:58 pmDEN-STL
2h 13mnonstop
United Airlines Logo
5:15 am - 6:53 amSTL-DEN
2h 38mnonstop
$144United Airlines
Find Deal
Fri, Oct 10 - Mon, Oct 13
Southwest Logo
12:10 pm - 5:10 pmDEN-STL
4h 00m1 stop
Southwest Logo
8:50 pm - 12:40 amSTL-DEN
4h 50m1 stop
$162Southwest
Find Deal
Sat, Oct 25 - Sun, Oct 26
Southwest Logo
5:40 pm - 12:15 amDEN-STL
5h 35m1 stop
Southwest Logo
6:40 pm - 11:50 pmSTL-DEN
6h 10m1 stop
$167Southwest
Find Deal
Sat, Nov 22 - Sun, Nov 23
Delta Logo
11:15 am - 7:06 pmSEA-STL
5h 51m1 stop
Delta Logo
2:36 pm - 10:15 pmSTL-SEA
9h 39m1 stop
$177Delta
Find Deal
Wed, Dec 3 - Tue, Dec 9
Delta Logo
1:39 pm - 11:28 pmSEA-STL
7h 49m1 stop
Delta Logo
6:00 am - 10:54 amSTL-SEA
6h 54m1 stop
$185Delta
Find Deal
Wed, Dec 3 - Sun, Dec 14

Frontier flights from United States to St. Louis

Our best Frontier deals on United States to St. Louis flight tickets
Frontier
Dec 5
DEN6:50 amDenver Intl
2h 12m
STL10:02 amLambert-St Louis
Dec 8
STL7:43 pmLambert-St Louis
2h 32m
DEN9:15 pmDenver Intl
$96
Find similar
Frontier
Nov 12
DEN6:00 amDenver Intl
2h 07m
STL9:07 amLambert-St Louis
Nov 14
STL7:45 pmLambert-St Louis
2h 28m
DEN9:13 pmDenver Intl
$100
Find similar
Frontier
Oct 8
DEN6:00 amDenver Intl
2h 07m
STL9:07 amLambert-St Louis
Oct 12
STL7:52 pmLambert-St Louis
2h 28m
DEN9:20 pmDenver Intl
$101
Find similar

United Airlines flights from United States to St. Louis

Our best United Airlines deals on United States to St. Louis flight tickets
United Airlines
Oct 10
DEN8:45 pmDenver Intl
2h 13m
STL11:58 pmLambert-St Louis
Oct 14
STL1:40 pmLambert-St Louis
2h 20m
DEN3:00 pmDenver Intl
$131
Find similar
United Airlines
Oct 10
DEN8:45 pmDenver Intl
2h 13m
STL11:58 pmLambert-St Louis
Oct 13
STL5:15 amLambert-St Louis
2h 38m
DEN6:53 amDenver Intl
$144
Find similar
United Airlines
Oct 9
DEN8:45 pmDenver Intl
2h 13m
STL11:58 pmLambert-St Louis
Oct 14
STL5:28 pmLambert-St Louis
7h 02m
1 stop
DEN11:30 pmDenver Intl
$154
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from United States 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, momondo users made 832,500 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from the United States to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 12/5

6:50 am-10:02 am

Nonstop2h 12m

Lambert-St Louis

Mon 12/8

7:43 pm-9:15 pm

Nonstop2h 32m

$96

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 11/12

6:00 am-9:07 am

Nonstop2h 07m

Lambert-St Louis

Fri 11/14

7:45 pm-9:13 pm

Nonstop2h 28m

$100

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 10/10

8:45 pm-11:58 pm

Nonstop2h 13m

Lambert-St Louis

Tue 10/14

1:40 pm-3:00 pm

Nonstop2h 20m

$131

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Sat 10/25

7:00 am-8:53 am

Nonstop1h 53m

Lambert-St Louis

Tue 10/28

8:49 am-10:46 am

Nonstop1h 57m

$139

DallasSt. Louis

DFW - STL

DFWSTL

Dallas/Fort Worth

Tue 10/28

6:59 pm-8:53 pm

Nonstop1h 54m

Lambert-St Louis

Tue 11/4

5:58 pm-8:05 pm

Nonstop2h 07m

$140

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Fri 10/10

8:45 pm-11:58 pm

Nonstop2h 13m

Lambert-St Louis

Mon 10/13

5:15 am-6:53 am

Nonstop2h 38m

$144

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 10/25

12:10 pm-5:10 pm

1 stop4h 00m

Lambert-St Louis

Sun 10/26

8:50 pm-12:40 am

1 stop4h 50m

$162

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 11/22

5:40 pm-12:15 am

1 stop5h 35m

Lambert-St Louis

Sun 11/23

6:40 pm-11:50 pm

1 stop6h 10m

$167

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/3

11:15 am-7:06 pm

1 stop5h 51m

Lambert-St Louis

Tue 12/9

2:36 pm-10:15 pm

1 stop9h 39m

$177

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/3

1:39 pm-11:28 pm

1 stop7h 49m

Lambert-St Louis

Sun 12/14

6:00 am-10:54 am

1 stop6h 54m

$185

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

How to get the cheapest flight ticket from United States to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

In general, January is the cheapest month to fly from United States to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $299. The month of March is another great option to travel to St. Louis, with average flight prices from United States averaging around $308.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $329. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $438. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from United States in the morning is the least expensive time of day to depart. momondo users have found prices as low as $348 when looking at flights departing in the morning. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $385 per ticket.

What is the cheapest United States to Lambert-St Louis flight route?

Fly from Orlando to Lambert-St Louis for the best United States - Lambert-St Louis flight prices

What cabin class options are available on United States to Lambert-St Louis flights?

There are 4 cabin classes available to choose from on United States to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on United States to St. Louis flights?

No. A direct flight is the cheapest option for a flight between United States to St. Louis.

Cheap United States to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United States to St. Louis

Best Price Found

$79

Fastest flight time

1h 36m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from United States in the past 72 hours is $79. The best round-trip flight deal from United States to St. Louis found on momondo in the last 72 hours is $105.
The fastest flight from United States to St. Louis takes 1h 36m
Direct flights go from United States to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • When did momondo last update prices for flights from United States to Lambert-St Louis Airport?

    Prices for flights from United States to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from United States to Lambert-St Louis Airport?

  • How old do you have to be to fly from United States to Lambert-St Louis Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United States to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from United States to St. Louis?

Best airlines flying from United States to St. Louis

Compare and see reviews for airlines that fly from United States to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $56Free CancellationRating
5.8
3,172 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $83Free CancellationRating
6.3
8,015 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $133Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $154Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
DeltaPriceFrom $168Free CancellationRating
7.9
7,954 reviews
Search Delta flights
SouthwestPriceFrom $171Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
Southern / MokulelePriceFrom $194Free CancellationRating
6.3
25 reviews
Search Southern / Mokulele flights
Alaska AirlinesPriceFrom $315Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from United States to St. Louis?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from United States to St. Louis for you.

Can I find flights from United States to St. Louis with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to St. Louis from United States with this policy.

How can momondo help me find flights from United States to St. Louis?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from United States to St. Louis.

I’m not ready to book a flight from United States to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from United States and alert you when they change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 10/15
Wed 10/22
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States