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Cheap flights from the United States to St. Louis from $43

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 11/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from the United States to St. Louis

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

Enter your travel dates to find the best prices.
Frontier Logo
11:03 am - 8:12 pmDEN-STL
8h 09m1 stop
Frontier Logo
7:45 pm - 9:13 pmSTL-DEN
2h 28mnonstop
$99Frontier
Find Deal
Fri, Nov 7 - Sat, Nov 8
Frontier Logo
6:00 am - 9:07 amDEN-STL
2h 07mnonstop
Frontier Logo
9:07 pm - 8:05 pmSTL-DEN
23h 58m1 stop
$100Frontier
Find Deal
Sat, Nov 15 - Mon, Nov 17
Southwest Logo
8:45 am - 9:35 amATL-STL
1h 50mnonstop
Southwest Logo
6:10 pm - 8:45 pmSTL-ATL
1h 35mnonstop
$187Southwest
Find Deal
Mon, Nov 17 - Mon, Nov 17
Southwest Logo
8:45 pm - 9:30 pmATL-STL
1h 45mnonstop
Southwest Logo
6:45 pm - 9:15 pmSTL-ATL
1h 30mnonstop
$196Southwest
Find Deal
Thu, Nov 13 - Sun, Nov 16
Delta Logo
1:30 pm - 12:24 amSEA-STL
8h 54m1 stop
Delta Logo
5:34 pm - 12:01 amSTL-SEA
8h 27m1 stop
$233Delta
Find Deal
Sun, Nov 2 - Mon, Nov 10
American Airlines Logo
6:40 am - 4:16 pmMSP-STL
9h 36m1 stop
American Airlines Logo
5:00 am - 12:48 pmSTL-MSP
7h 48m1 stop
$237American Airlines
Find Deal
Mon, Nov 24 - Wed, Nov 26
Delta Logo
5:25 am - 1:30 pmSEA-STL
6h 05m1 stop
Delta Logo
6:00 am - 10:54 amSTL-SEA
6h 54m1 stop
$238Delta
Find Deal
Wed, Dec 3 - Tue, Dec 16
American Airlines Logo
2:55 pm - 11:51 pmSEA-STL
6h 56m1 stop
American Airlines Logo
5:17 am - 10:44 amSTL-SEA
7h 27m1 stop
$239American Airlines
Find Deal
Wed, Nov 19 - Tue, Dec 2
United Airlines Logo
6:00 am - 12:15 pmMSP-STL
6h 15m1 stop
United Airlines Logo
1:35 pm - 8:59 pmSTL-MSP
7h 24m1 stop
$251United Airlines
Find Deal
Thu, Dec 11 - Sat, Dec 13
United Airlines Logo
9:15 am - 11:04 amEWR-STL
2h 49mnonstop
United Airlines Logo
11:49 am - 3:12 pmSTL-EWR
2h 23mnonstop
$269United Airlines
Find Deal
Wed, Oct 29 - Fri, Oct 31

Frontier flights from United States to St. Louis

Our best Frontier deals on United States to St. Louis flight tickets
Frontier
Nov 7
DEN11:03 amDenver Intl
8h 09m
1 stop
STL8:12 pmLambert-St Louis
Nov 8
STL7:45 pmLambert-St Louis
2h 28m
DEN9:13 pmDenver Intl
$99
Find similar
Frontier
Nov 15
DEN6:00 amDenver Intl
2h 07m
STL9:07 amLambert-St Louis
Nov 17
STL9:07 pmLambert-St Louis
23h 58m
1 stop
DEN8:05 pmDenver Intl
$100
Find similar
Frontier
Nov 7
DEN6:00 amDenver Intl
2h 07m
STL9:07 amLambert-St Louis
Nov 10
STL7:45 pmLambert-St Louis
2h 28m
DEN9:13 pmDenver Intl
$102
Find similar

Southwest flights from United States to St. Louis

Our best Southwest deals on United States to St. Louis flight tickets
Southwest
Nov 17
ATL8:45 amAtlanta Hartsfield-Jackson
1h 50m
STL9:35 amLambert-St Louis
Nov 17
STL6:10 pmLambert-St Louis
1h 35m
ATL8:45 pmAtlanta Hartsfield-Jackson
$187
Find similar
Southwest
Nov 13
ATL8:45 pmAtlanta Hartsfield-Jackson
1h 45m
STL9:30 pmLambert-St Louis
Nov 16
STL6:45 pmLambert-St Louis
1h 30m
ATL9:15 pmAtlanta Hartsfield-Jackson
$196
Find similar
Southwest
Dec 4
MSP5:30 amMinneapolis St Paul
1h 45m
STL7:15 amLambert-St Louis
Dec 4
STL10:20 amLambert-St Louis
1h 30m
MSP11:50 amMinneapolis St Paul
$255
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 October 19, 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 11/7

11:03 am-8:12 pm

1 stop8h 09m

Lambert-St Louis

Sat 11/8

7:45 pm-9:13 pm

Nonstop2h 28m

$99

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Sat 11/15

6:00 am-9:07 am

Nonstop2h 07m

Lambert-St Louis

Mon 11/17

9:07 pm-8:05 pm

1 stop23h 58m

$100

AtlantaSt. Louis

ATL - STL

ATLSTL

Atlanta Hartsfield-Jackson

Mon 11/17

8:45 am-9:35 am

Nonstop1h 50m

Lambert-St Louis

Mon 11/17

6:10 pm-8:45 pm

Nonstop1h 35m

$187

AtlantaSt. Louis

ATL - STL

ATLSTL

Atlanta Hartsfield-Jackson

Thu 11/13

8:45 pm-9:30 pm

Nonstop1h 45m

Lambert-St Louis

Sun 11/16

6:45 pm-9:15 pm

Nonstop1h 30m

$196

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Sun 11/2

1:30 pm-12:24 am

1 stop8h 54m

Lambert-St Louis

Mon 11/10

5:34 pm-12:01 am

1 stop8h 27m

$233

MinneapolisSt. Louis

MSP - STL

MSPSTL

Minneapolis St Paul

Mon 11/24

6:40 am-4:16 pm

1 stop9h 36m

Lambert-St Louis

Wed 11/26

5:00 am-12:48 pm

1 stop7h 48m

$237

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 12/3

5:25 am-1:30 pm

1 stop6h 05m

Lambert-St Louis

Tue 12/16

6:00 am-10:54 am

1 stop6h 54m

$238

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 11/19

2:55 pm-11:51 pm

1 stop6h 56m

Lambert-St Louis

Tue 12/2

5:17 am-10:44 am

1 stop7h 27m

$239

MinneapolisSt. Louis

MSP - STL

MSPSTL

Minneapolis St Paul

Thu 12/11

6:00 am-12:15 pm

1 stop6h 15m

Lambert-St Louis

Sat 12/13

1:35 pm-8:59 pm

1 stop7h 24m

$251

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Wed 10/29

9:15 am-11:04 am

Nonstop2h 49m

Lambert-St Louis

Fri 10/31

11:49 am-3:12 pm

Nonstop2h 23m

$269

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 $300. 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 $322. 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 $434. 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 $346 when looking at flights departing in the morning. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $375 per ticket.

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

Fly from Denver Intl 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

$93

Fastest flight time

1h 25m

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 $93. The best round-trip flight deal from United States to St. Louis found on momondo in the last 72 hours is $61.
The fastest flight from United States to St. Louis takes 1h 25m
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 $57Free CancellationRating
5.8
3,133 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $80Free CancellationRating
6.3
8,102 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $133Free CancellationRating
7.2
11,031 reviews
Search American Airlines flights
United AirlinesPriceFrom $155Free CancellationRating
7.4
8,989 reviews
Search United Airlines flights
DeltaPriceFrom $168Free CancellationRating
7.9
7,975 reviews
Search Delta flights
SouthwestPriceFrom $177Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $257Free CancellationRating
8.0
11,121 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
Wentzville
Collinsville
Fenton
St. Peters
Alton
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.

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