HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
USA

$36+ Cheap flights from St. Louis (STL) to the United States

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LAX
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to USA with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from St. Louis to USA

Keep the following information in mind while searching for St. Louis to USA flight deals. Data was last updated September 17, 2025.

Round-trip from

$75
(Kiwi.com)

One-way from

$36
(Cheapflightsfares)

Popular in

November

Cheapest in

April

Average price

$302

Good round-trip deal

$78 or less

Good one-way deal

$93 or less
From Lambert-St Louis to USA
Search Deals
One-way flight from Lambert-St Louis to USA
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to USA.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to USA.
Search Deals

Find flight deals from St. Louis to USA

Cheapest flights from St. Louis to USA
Explore the most affordable flight options available from St. Louis to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/308:40 pmSTL - DEN
Nonstop2h 30mFrontier
Wed 11/56:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/15$75
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/117:52 pmSTL - DEN
Nonstop2h 28mFrontier
Mon 10/136:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/16$81
This Cheapflightsfares deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:52 pmSTL - DEN
Nonstop2h 28mFrontier
Mon 10/276:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/16$82
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/77:52 pmSTL - DEN
Nonstop2h 28mFrontier
Wed 10/86:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/17$83
This Cheapflightsfares deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/307:55 pmSTL - DEN
Nonstop2h 25mFrontier
Mon 10/66:00 amDEN - STL
Nonstop2h 06mFrontier
Deal found 9/15$84
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/307:55 pmSTL - DEN
Nonstop2h 25mFrontier
Wed 10/86:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/15$85
This Kiwi.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/107:52 pmSTL - DEN
Nonstop2h 28mFrontier
Mon 10/276:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/15$86
This Booking.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:52 pmSTL - DEN
Nonstop2h 28mFrontier
Tue 10/286:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/17$87
This Priceline deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/27:45 pmSTL - DEN
Nonstop2h 28mFrontier
Fri 11/146:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/16$90
This Flightnetwork deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/247:52 pmSTL - DEN
Nonstop2h 28mFrontier
Mon 10/276:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/15$92
This Cheapflightsfares deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:55 pmSTL - DEN
Nonstop2h 25mFrontier
Sun 10/56:00 amDEN - STL
Nonstop2h 06mFrontier
Deal found 9/16$94
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:55 pmSTL - DEN
Nonstop2h 25mFrontier
Wed 10/86:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 9/15$95

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to USA 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, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
Use the filters below to find and compare flights from St. Louis to the United States that are best for you.

Fly from

St. Louis

Fly to

USA

Route

Depart

Return

Price

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Wed 10/8

5:15 am-6:53 am

Nonstop2h 38m

Denver Intl

Thu 10/9

8:45 pm-11:58 pm

Nonstop2h 13m

$131

St. LouisDallas

STL - DFW

STLDFW

Lambert-St Louis

Wed 10/15

5:20 am-7:18 am

Nonstop1h 58m

Dallas/Fort Worth

Wed 10/22

9:29 pm-11:18 pm

Nonstop1h 49m

$139

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Thu 10/23

1:41 pm-5:05 pm

Nonstop2h 24m

Orlando

Thu 10/30

11:38 am-1:17 pm

Nonstop2h 39m

$148

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Tue 11/18

7:00 am-2:24 pm

1 stop6h 24m

Orlando

Mon 11/24

10:30 am-3:46 pm

1 stop6h 16m

$151

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Wed 11/19

7:00 am-2:24 pm

1 stop6h 24m

Orlando

Fri 11/21

9:40 am-3:46 pm

1 stop7h 06m

$151

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Thu 11/13

7:45 pm-5:44 am

1 stop8h 59m

Orlando

Sun 11/16

5:25 am-10:12 am

1 stop5h 47m

$152

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Thu 11/13

7:45 pm-5:44 am

1 stop8h 59m

Orlando

Mon 11/17

8:00 am-9:40 am

Nonstop2h 40m

$154

St. LouisDallas

STL - DFW

STLDFW

Lambert-St Louis

Thu 10/23

1:41 pm-11:27 am

1 stop21h 46m

Dallas/Fort Worth

Sun 10/26

6:00 am-11:43 am

1 stop29h 43m

$155

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

Sat 12/13

4:37 pm-6:07 pm

Nonstop2h 30m

Denver Intl

Tue 12/16

5:53 pm-8:57 pm

Nonstop2h 04m

$157

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

Wed 11/12

11:33 am-6:45 pm

1 stop6h 12m

Orlando

Sat 11/15

5:15 am-12:37 pm

1 stop8h 22m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from St. Louis to USA

Have a flexible travel schedule? Discover the best time to fly to USA from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to the United States

What is the cheapest month to book a flight from St. Louis to USA?

Currently, January is the cheapest month in which you can book a flight from St. Louis to USA (average of $246). Flying from St. Louis to USA in March is currently the most expensive (average of $325). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to US?

Find hourly flight availability from St. Louis to USA. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

When flying from St. Louis to USA, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from St. Louis to USA

Explore weekly flight availability from St. Louis to USA. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 17, 2025.

The most flights from STL to US0 are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing USA

Get insights into the airlines that provide service to USA. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to USA. Reviews last updated September 17, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines from St. Louis to the United States to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,961 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,173 reviews
Southwest
8.0
Very good
4,242 reviews

Comfort

8.0

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from St. Louis to USA. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to United States?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to United States. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • How popular is this St. Louis to USA flight route?

    Flights from Lambert-St Louis to United States have been viewed 15 times in the past calendar month.

  • How long is the flight from St. Louis to USA?

    For as low as $139, United Airlines can have you in USA from St. Louis in 1h 58m. The distance between St. Louis and USA is about 550 mi. All flights are typically nonstop.

  • What are the cheapest airlines to fly from St. Louis to USA one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $49. Southwest flights start at $66 while deals on United Airlines start at $66 one-way.

  • What are the most popular routes from St. Louis to USA?

    The most popular flight routes from St. Louis to USA are Lambert-St Louis - Las Vegas Harry Reid Intl, Lambert-St Louis - New York John F Kennedy Intl and Lambert-St Louis - New York LaGuardia.

  • What are the most reliable airlines from St. Louis to USA?

    Before booking your flight to USA from St. Louis, check out the most reliable airlines to get you to your destination on time: Alaska Airlines (90%), SkyWest Airlines (88%), American Airlines( 88%).

  • What are the cheapest flights from St. Louis to USA?

    Looking for the cheapest flight from St. Louis to USA? While on average our users pay $704, our data indicates the cheapest price to be $143. The most popular route (Lambert-St Louis - Las Vegas Harry Reid Intl), is priced around $139.

  • Can I find deals for flights from St. Louis to USA that include hotel bookings?

    Yes. In addition to deals on St. Louis to USA flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to USA?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to USA.

  • Can I find deals for business class flights from St. Louis to USA?

    Yes. Cheapflights offers flight deals from St. Louis to USA by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to USA?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to USA (average of $246). Flying from St. Louis to USA in March is currently the most expensive (average of $325). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to USA

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Las Vegas flights
St. Louis to John F Kennedy Intl flights
St. Louis to LaGuardia flights
St. Louis to Newark flights
Kansas City to Las Vegas flights
St. Louis to Orlando flights
Kansas City to John F Kennedy Intl flights
Kansas City to Newark flights
Kansas City to LaGuardia flights
Kansas City to O'Hare Intl flights
St. Louis to Denver flights
Kansas City to Seattle flights
St. Louis to Dallas/Fort Worth flights
St. Louis to Sky Harbor Intl flights
Kansas City to Cancún flights
Kansas City to Los Angeles flights
Kansas City to Sky Harbor Intl flights
St. Louis to Miami flights
St. Louis to Seattle flights
Kansas City to Atlanta flights
Kansas City to Orlando flights
St. Louis to Boston flights
Kansas City to Dallas/Fort Worth flights
St. Louis to Atlanta flights
Kansas City to Denver flights
Kansas City to Hobby flights
St. Louis to Cancún flights
Kansas City to Miami flights
St. Louis to Los Angeles flights
St. Louis to Hobby flights
St. Louis to Dulles Intl flights
Kansas City to Boston flights
Kansas City to George Bush Intcntl flights
Kansas City to Minneapolis flights
Kansas City to Dulles Intl flights
St. Louis to San Francisco flights
Kansas City to Cozumel flights
St. Louis to George Bush Intcntl flights
St. Louis to O'Hare Intl flights
Kansas City to Tampa flights
St. Louis to Minneapolis flights
St. Louis to Tampa flights
St. Louis to New Orleans flights
St. Louis to Reagan-National flights
St. Louis to Baltimore flights
Kansas City to San Francisco flights
Kansas City to Portland flights
Kansas City to Fort Lauderdale flights
Kansas City to Midway flights
St. Louis to Salt Lake City flights

Top 9 airlines flying from St. Louis to USA

Discover the top 9 airlines that operate flights from St. Louis to USA. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$53Average$197FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$76Average$190FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$104Average$238FlexibilityNo cancel feeOn-time88%
DeltaCheapest$128Average$351FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$154Average$406FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$174Average$408FlexibilityNo cancel feeOn-time63%
Southern / MokuleleCheapest$194Average$264FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$194Average$372FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$296Average$475FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.