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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 2/18. 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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0 bags

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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
11:38 am - 2:46 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
3:46 pm - 5:23 pm
STL
-
DEN
2h 37mnonstop
$82Frontier
Wed, Feb 4 - Sat, Feb 7
Frontier Logo
11:38 am - 2:46 pm
DEN
-
STL
2h 08mnonstop
Frontier Logo
1:40 pm - 3:16 pm
STL
-
DEN
2h 36mnonstop
$83Frontier
Wed, Feb 4 - Mon, Feb 9
Delta Logo
9:40 am - 6:00 pm
SEA
-
STL
6h 20m
1 stop
Delta Logo
6:59 pm - 12:01 am
STL
-
SEA
7h 02m
1 stop
$209Delta
Wed, May 27 - Fri, May 29
Southwest Logo
3:00 pm - 11:20 pm
SEA
-
STL
6h 20m
1 stop
Southwest Logo
5:35 pm - 1:25 am
STL
-
SEA
9h 50m
1 stop
$218Southwest
Wed, Mar 25 - Mon, Mar 30
United Airlines Logo
12:55 pm - 8:26 pm
SEA
-
STL
5h 31m
1 stop
United Airlines Logo
6:05 pm - 10:59 pm
STL
-
SEA
6h 54m
1 stop
$219United Airlines
Tue, Mar 3 - Fri, Mar 6
United Airlines Logo
3:30 pm - 11:34 pm
SEA
-
STL
6h 04m
1 stop
United Airlines Logo
10:00 am - 6:04 pm
STL
-
SEA
10h 04m
2 stops
$224United Airlines
Mon, Mar 9 - Tue, Mar 10
Delta Logo
11:59 pm - 11:30 am
SEA
-
STL
9h 31m
1 stop
Delta Logo
6:59 pm - 12:01 am
STL
-
SEA
7h 02m
1 stop
$230Delta
Mon, May 11 - Mon, May 18
American Airlines Logo
6:30 am - 11:29 am
JFK
-
STL
5h 59m
1 stop
American Airlines Logo
6:00 am - 2:49 pm
STL
-
JFK
7h 49m
1 stop
$261American Airlines
Wed, Apr 1 - Tue, Apr 7
American Airlines Logo
6:00 am - 10:20 am
LGA
-
STL
5h 20m
1 stop
American Airlines Logo
11:27 am - 2:55 pm
STL
-
LGA
2h 28mnonstop
$264American Airlines
Thu, Feb 5 - Thu, Feb 5
Southwest Logo
6:20 am - 1:00 pm
LGA
-
STL
7h 40m
1 stop
Southwest Logo
6:00 am - 9:20 am
STL
-
LGA
2h 20mnonstop
$269Southwest
Tue, Apr 14 - Sat, Apr 18

Frontier flights from United States to St. Louis

Our best Frontier deals on United States to St. Louis flight tickets
Frontier
Feb 4
DEN11:38 amDenver Intl
2h 08m
STL2:46 pmLambert-St Louis
Feb 7
STL3:46 pmLambert-St Louis
2h 37m
DEN5:23 pmDenver Intl
$82
Frontier
Feb 4
DEN11:38 amDenver Intl
2h 08m
STL2:46 pmLambert-St Louis
Feb 9
STL1:40 pmLambert-St Louis
2h 36m
DEN3:16 pmDenver Intl
$83
Frontier
Feb 27
DEN10:01 amDenver Intl
2h 08m
STL1:09 pmLambert-St Louis
Mar 2
STL1:54 pmLambert-St Louis
2h 36m
DEN3:30 pmDenver Intl
$88

Delta flights from United States to St. Louis

Our best Delta deals on United States to St. Louis flight tickets
Delta
May 27
SEA6:05 amSeattle/Tacoma Intl
8h 40m
1 stop
STL4:45 pmLambert-St Louis
May 28
STL6:59 pmLambert-St Louis
7h 02m
1 stop
SEA12:01 amSeattle/Tacoma Intl
$209
Delta
May 11
SEA11:59 pmSeattle/Tacoma Intl
9h 31m
1 stop
STL11:30 amLambert-St Louis
May 18
STL6:59 pmLambert-St Louis
7h 02m
1 stop
SEA12:01 amSeattle/Tacoma Intl
$230
Delta
May 28
SEA11:59 pmSeattle/Tacoma Intl
6h 41m
1 stop
STL8:40 amLambert-St Louis
Jun 2
STL6:59 pmLambert-St Louis
7h 02m
1 stop
SEA12:01 amSeattle/Tacoma Intl
$234

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 January 22, 2026.
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

Wed 2/4

11:38 am-2:46 pm

Nonstop2h 08m

Lambert-St Louis

Sat 2/7

3:46 pm-5:23 pm

Nonstop2h 37m

$82

DenverSt. Louis

DEN - STL

DENSTL

Denver Intl

Wed 2/4

11:38 am-2:46 pm

Nonstop2h 08m

Lambert-St Louis

Mon 2/9

1:40 pm-3:16 pm

Nonstop2h 36m

$83

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 5/27

9:40 am-6:00 pm

1 stop6h 20m

Lambert-St Louis

Fri 5/29

6:59 pm-12:01 am

1 stop7h 02m

$209

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 3/25

3:00 pm-11:20 pm

1 stop6h 20m

Lambert-St Louis

Mon 3/30

5:35 pm-1:25 am

1 stop9h 50m

$218

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Tue 3/3

12:55 pm-8:26 pm

1 stop5h 31m

Lambert-St Louis

Fri 3/6

6:05 pm-10:59 pm

1 stop6h 54m

$219

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 3/9

3:30 pm-11:34 pm

1 stop6h 04m

Lambert-St Louis

Tue 3/10

10:00 am-6:04 pm

2 stops10h 04m

$224

SeattleSt. Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Mon 5/11

11:59 pm-11:30 am

1 stop9h 31m

Lambert-St Louis

Mon 5/18

6:59 pm-12:01 am

1 stop7h 02m

$230

New YorkSt. Louis

JFK - STL

JFKSTL

New York John F Kennedy Intl

Wed 4/1

6:30 am-11:29 am

1 stop5h 59m

Lambert-St Louis

Tue 4/7

6:00 am-2:49 pm

1 stop7h 49m

$261

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Thu 2/5

6:00 am-10:20 am

1 stop5h 20m

Lambert-St Louis

Thu 2/5

11:27 am-2:55 pm

Nonstop2h 28m

$264

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Tue 4/14

6:20 am-1:00 pm

1 stop7h 40m

Lambert-St Louis

Sat 4/18

6:00 am-9:20 am

Nonstop2h 20m

$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, March 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 $298. The month of April 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 $314. 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 $440. 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 $343 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 $368 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

$99

Fastest flight time

1h 05m

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 $99. 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 05m
Direct flights go from United States to St. Louis every day.
There is 1 airport in St. Louis. From United States there are direct flights to 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 $49Free CancellationRating
5.7
3,057 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $54Free CancellationRating
6.3
8,363 reviews
Search Spirit Airlines flights
DeltaPriceFrom $126Free CancellationRating
7.9
8,087 reviews
Search Delta flights
American AirlinesPriceFrom $133Free CancellationRating
7.2
11,173 reviews
Search American Airlines flights
United AirlinesPriceFrom $154Free CancellationRating
7.4
9,190 reviews
Search United Airlines flights
SouthwestPriceFrom $177Free CancellationRating
8.0
4,267 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $257Free CancellationRating
8.0
11,775 reviews
Search Alaska Airlines flights
JetBluePriceFrom $385Free CancellationRating
7.2
2,890 reviews
Search JetBlue 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
Maryland Heights
Florissant
O'Fallon
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Edwardsville
Festus
Glencoe
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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