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$19+ 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 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LAX
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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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 octubre 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$70
(Mytrip)

One-way from

$19
(Kiwi.com)

Popular in

November

Cheapest in

April

Average price

$369

Good round-trip deal

$153 or less

Good one-way deal

$88 or less
Provider with most accurate pricing for Lambert-St Louis-New York (NYC) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-New York (NYC) flights.
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From Lambert-St Louis to USA
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One-way flight from Lambert-St Louis to USA
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Highest demand for flights based on searches. 15% potential increase in price ($55 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Price to beat on a round-trip flight from Lambert-St Louis to USA.
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Price to beat on a one-way flight from Lambert-St Louis to USA.
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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 octubre 30, 2025.

This Mytrip deal was found by Cheapflights users on 10/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/137:43 pmSTL - DEN
Nonstop2h 32mFrontier
sáb. 12/206:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 10/28$70
This Frontier deal was found by Cheapflights users on 10/30. 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.
lun. 12/812:07 pmSTL - DEN
1 stop13h 13mFrontier
sáb. 12/137:05 amDEN - STL
Nonstop2h 09mFrontier
Deal found 10/30$82
This Flightnetwork deal was found by Cheapflights users on 10/29. 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.
sáb. 12/67:43 pmSTL - DEN
Nonstop2h 32mFrontier
lun. 12/811:59 pmDEN - STL
1 stop21h 34mFrontier
Deal found 10/29$83
This Cheapflightsfares deal was found by Cheapflights users on 10/30. 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.
sáb. 11/154:51 pmSTL - DEN
1 stop12h 08mFrontier
mar. 11/186:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/30$86
This Frontier deal was found by Cheapflights users on 10/29. 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.
sáb. 12/137:43 pmSTL - DEN
Nonstop2h 32mFrontier
sáb. 1/36:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 10/29$87
This Frontier deal was found by Cheapflights users on 10/30. 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.
lun. 12/87:43 pmSTL - DEN
Nonstop2h 32mFrontier
mié. 12/107:05 amDEN - STL
Nonstop2h 09mFrontier
Deal found 10/30$88
This Frontier deal was found by Cheapflights users on 10/30. 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.
sáb. 12/137:43 pmSTL - DEN
Nonstop2h 32mFrontier
sáb. 12/1312:59 amDEN - STL
1 stop7h 48mFrontier
Deal found 10/30$91
This Priceline deal was found by Cheapflights users on 10/29. 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.
mar. 11/187:45 pmSTL - DEN
Nonstop2h 28mFrontier
mié. 11/196:00 amDEN - STL
Nonstop2h 07mFrontier
Deal found 10/29$92
This Frontier deal was found by Cheapflights users on 10/30. 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.
vie. 12/1212:07 pmSTL - DEN
1 stop13h 13mFrontier
sáb. 12/137:05 amDEN - STL
Nonstop2h 09mFrontier
Deal found 10/30$96
This Frontier deal was found by Cheapflights users on 10/29. 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.
sáb. 12/137:43 pmSTL - DEN
Nonstop2h 32mFrontier
vie. 1/26:50 amDEN - STL
Nonstop2h 12mFrontier
Deal found 10/29$97
This CheapOair deal was found by Cheapflights users on 10/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/107:43 pmSTL - DEN
Nonstop2h 32mFrontier
sáb. 12/137:33 amDEN - STL
1 stop27h 39mFrontier
Deal found 10/30$99
This Frontier deal was found by Cheapflights users on 10/28. 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.
mar. 12/93:30 pmSTL - DEN
1 stop8h 34mFrontier
sáb. 12/137:05 amDEN - STL
Nonstop2h 09mFrontier
Deal found 10/28$102

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 octubre 30, 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

mié. 12/10

3:30 pm-11:04 pm

1 stop8h 34m

Denver Intl

sáb. 12/13

7:05 am-10:14 am

Nonstop2h 09m

$82

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

jue. 11/13

7:45 pm-9:13 pm

Nonstop2h 28m

Denver Intl

lun. 11/17

11:03 am-8:12 pm

1 stop8h 09m

$125

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 1/21

5:11 pm-7:45 am

2 stops15h 34m

Denver Intl

vie. 1/23

6:50 am-10:02 am

Nonstop2h 12m

$140

St. LouisAtlanta

STL - ATL

STLATL

Lambert-St Louis

vie. 11/14

5:05 pm-9:33 pm

1 stop27h 28m

Atlanta Hartsfield-Jackson

mar. 11/18

8:30 am-10:05 am

1 stop26h 35m

$143

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

jue. 12/11

12:04 pm-9:38 pm

1 stop10h 34m

Denver Intl

dom. 12/14

10:44 pm-11:22 am

1 stop11h 38m

$144

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 3/4

7:43 pm-9:15 pm

Nonstop2h 32m

Denver Intl

lun. 3/9

6:50 am-10:02 am

Nonstop2h 12m

$146

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

mié. 2/18

5:44 pm-9:04 am

1 stop16h 20m

Denver Intl

dom. 2/22

1:00 pm-4:49 pm

1 stop26h 49m

$154

St. LouisDenver

STL - DEN

STLDEN

Lambert-St Louis

vie. 11/14

11:05 am-11:16 pm

1 stop13h 11m

Denver Intl

dom. 11/16

12:16 am-1:17 pm

1 stop12h 01m

$171

St. LouisOrlando

STL - MCO

STLMCO

Lambert-St Louis

dom. 1/25

6:40 pm-10:00 pm

Nonstop2h 20m

Orlando

mié. 1/28

10:40 am-2:10 pm

1 stop4h 30m

$172

St. LouisAtlanta

STL - ATL

STLATL

Lambert-St Louis

vie. 11/7

2:12 pm-9:39 pm

1 stop6h 27m

Atlanta Hartsfield-Jackson

dom. 11/9

10:43 pm-9:40 am

1 stop11h 57m

$176

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 60 results
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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, February is the cheapest month in which you can book a flight from St. Louis to USA (average of $36). Flying from St. Louis to USA in July is currently the most expensive (average of $89). 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 octubre 30, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 19% on flights from St. Louis to USA by exploring options for tickets in the evening.

What is the cheapest day to fly from St. Louis to USA?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to USA. Price data was last updated on October 26, 2025.

Travelers seeking maximum savings on their St. Louis to USA flight should consider departing on Saturday evenings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 octubre 30, 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
4,243 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
7.9
Good
7,998 reviews
Southwest
8.0
Very good
4,243 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
8,998 reviews
Southwest
8.0
Very good
4,243 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
11,035 reviews
Southwest
8.0
Very good
4,243 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
3,122 reviews
Southwest
8.0
Very good
4,243 reviews

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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 16 times in the past calendar month.

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

    For as low as $197, Frontier can have you in USA from St. Louis in 1h 42m. The distance between St. Louis and USA is about 484 mi. This flight may include one or multiple stops.

  • 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 $48. Southwest flights start at $70 while deals on United Airlines start at $79 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 LaGuardia and Lambert-St Louis - Newark.

  • 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: Cathay Pacific (79%), Qantas Airways (77%), Japan Airlines( 77%).

  • 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 $1,288, our data indicates the cheapest price to be $147. The most popular route (Lambert-St Louis - Las Vegas Harry Reid Intl), is priced around $149.

  • 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, February is the cheapest month in which you can book a flight from St. Louis to USA (average of $36). Flying from St. Louis to USA in July is currently the most expensive (average of $89). 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

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Alternative routes for St. Louis to USA

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from St. Louis to USA

Discover the top 8 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 octubre 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$50Average$201FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$73Average$190FlexibilityNo cancel feeOn-time65%
Allegiant AirCheapest$104Average$238FlexibilityNo cancel feeOn-time88%
DeltaCheapest$108Average$356FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$150Average$403FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$166Average$371FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$407FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$257Average$475FlexibilityNo cancel feeOn-time75%

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