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$957+ Cheap flights from St. Louis (STL) to Buenos Aires (BUE)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Feb 18 — Feb 251
Wed 2/18
Wed 2/25
1 adult, Economy
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Cheap flight deals from St. Louis to Buenos Aires

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Buenos Aires (BUE). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 19, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$957
(United Airlines)

Popular in

June

Cheapest in

September

Average price

$1,410
Provider with most accurate pricing for Lambert-St Louis-Buenos Aires (BUE) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Buenos Aires (BUE) flights.
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From Lambert-St Louis to Buenos Aires (BUE)
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Highest demand for flights based on searches. 4% potential increase in price ($64 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find flight deals from St. Louis to Buenos Aires

Cheapest flights from St. Louis to Buenos Aires
Explore the most affordable flight options available from St. Louis to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 19, 2026.

This United Airlines deal was found by Cheapflights users on 1/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/87:41 am
STL
-
EZE
2 stops46h 39m
United Airlines
Tue 3/179:05 pm
EZE
-
STL
1 stop14h 16m
United Airlines
Deal found 1/17$957
This KAYAK deal was found by Cheapflights users on 1/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/87:03 am
STL
-
EZE
1 stop22h 17m
LATAM Airlines
Tue 3/178:55 pm
EZE
-
STL
1 stop14h 10m
LATAM Airlines
Deal found 1/17$1,024
This LATAM Airlines deal was found by Cheapflights users on 1/18. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:00 am
STL
-
EZE
2 stops26h 15m
Multiple Airlines
Tue 3/1711:00 am
EZE
-
STL
2 stops26h 09m
Multiple Airlines
Deal found 1/18$1,036
This American Airlines deal was found by Cheapflights users on 1/18. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/211:46 am
STL
-
EZE
1 stop17h 34m
American Airlines
Wed 3/1110:25 pm
EZE
-
STL
1 stop20h 48m
American Airlines
Deal found 1/18$1,067
This United Airlines deal was found by Cheapflights users on 1/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/31:11 pm
STL
-
EZE
2 stops17h 09m
United Airlines
Tue 3/109:05 pm
EZE
-
STL
2 stops26h 02m
United Airlines
Deal found 1/17$1,071
This KAYAK deal was found by Cheapflights users on 1/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/812:04 pm
STL
-
AEP
2 stops17h 51m
LATAM Airlines
Tue 3/175:15 pm
AEP
-
STL
2 stops19h 54m
LATAM Airlines
Deal found 1/17$1,079
This United Airlines deal was found by Cheapflights users on 1/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/27:41 am
STL
-
EZE
2 stops20h 39m
United Airlines
Wed 3/119:05 pm
EZE
-
STL
2 stops43h 38m
United Airlines
Deal found 1/18$1,087
This American Airlines deal was found by Cheapflights users on 1/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/811:46 am
STL
-
EZE
2 stops18h 14m
American Airlines
Tue 3/1710:25 pm
EZE
-
STL
1 stop14h 34m
American Airlines
Deal found 1/19$1,111
This KAYAK deal was found by Cheapflights users on 1/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/145:00 pm
STL
-
AEP
2 stops21h 00m
LATAM Airlines
Fri 3/2710:55 pm
AEP
-
STL
2 stops27h 03m
LATAM Airlines
Deal found 1/17$1,119
This KAYAK deal was found by Cheapflights users on 1/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/145:00 pm
STL
-
EZE
2 stops19h 55m
LATAM Airlines
Fri 3/279:55 pm
EZE
-
STL
2 stops28h 03m
LATAM Airlines
Deal found 1/17$1,119
This KAYAK deal was found by Cheapflights users on 1/18. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/215:00 pm
STL
-
EZE
2 stops25h 55m
LATAM Airlines
Sat 4/47:35 am
EZE
-
STL
3 stops29h 34m
LATAM Airlines
Deal found 1/18$1,122
This LATAM Airlines deal was found by Cheapflights users on 1/16. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:40 am
STL
-
AEP
2 stops28h 20m
LATAM Airlines
Mon 5/43:40 pm
AEP
-
STL
2 stops20h 54m
LATAM Airlines
Deal found 1/16$1,123

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Buenos Aires 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 January 19, 2026.
Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.

Fly from

St. Louis

Fly to

Buenos Aires

Route

Depart

Return

Price

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:41 am-8:20 am

2 stops46h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-9:21 am

1 stop14h 16m

$957

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

4:21 pm-9:00 am

1 stop14h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

2:45 pm-9:05 am

2 stops20h 20m

$1,032

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/3

11:25 am-7:20 am

2 stops16h 55m

Buenos Aires Ministro Pistarini

Tue 3/10

9:05 pm-9:21 am

1 stop14h 16m

$1,071

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

12:04 pm-7:55 am

2 stops17h 51m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-11:09 am

2 stops19h 54m

$1,079

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/2

7:41 am-7:20 am

2 stops20h 39m

Buenos Aires Ministro Pistarini

Wed 3/11

9:05 pm-2:43 pm

2 stops43h 38m

$1,087

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

3:49 pm-9:59 am

2 stops16h 10m

Buenos Aires Ministro Pistarini

Tue 3/17

11:30 pm-3:35 pm

2 stops18h 05m

$1,111

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 3/21

5:00 pm-5:00 pm

2 stops22h 00m

Buenos Aires Jorge Newbery

Sat 4/4

5:05 pm-5:53 pm

2 stops26h 48m

$1,119

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 3/14

5:00 pm-4:00 pm

2 stops21h 00m

Buenos Aires Jorge Newbery

Fri 3/27

10:55 pm-11:58 pm

2 stops27h 03m

$1,119

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 3/21

10:07 am-9:00 am

1 stop20h 53m

Buenos Aires Ministro Pistarini

Sat 4/4

7:35 am-11:58 pm

2 stops18h 23m

$1,119

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 3/14

5:00 pm-2:55 pm

2 stops19h 55m

Buenos Aires Ministro Pistarini

Fri 3/27

8:55 pm-9:02 am

1 stop14h 07m

$1,119

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/16

Showing 1-10 of 20 results
1
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Compare providers for flights from St. Louis to Buenos Aires

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Buenos Aires in January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Buenos Aires flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Buenos Aires flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Buenos Aires flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Buenos Aires flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Buenos Aires flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Buenos Aires

Have a flexible travel schedule? Discover the best time to fly to Buenos Aires 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 Buenos Aires
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Buenos Aires

Get insights into the airlines that provide service to Buenos Aires. 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 Buenos Aires. Reviews last updated January 19, 2026.
Get a feel of what it's like to fly with Delta, LATAM Airlines, and American Airlines from St. Louis to Buenos Aires by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,075 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,075 reviews
Delta
7.9
Good
8,075 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
LATAM Airlines
7.5
Good
1,910 reviews
Delta
7.9
Good
8,075 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,158 reviews
Delta
7.9
Good
8,075 reviews

Entertainment

7.8

Overall

7.9

Boarding

8.1

Crew

8.5

Food

7.2

Comfort

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Buenos Aires. 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 Buenos Aires?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Buenos Aires from St. Louis. Booking flights from Lambert-St Louis (STL) to Buenos Aires should be relatively easy as there are 0 daily outbound flights to Buenos Aires from 1 airline.

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

    Airlines like United Airlines, Delta, and LATAM Airlines fly from St. Louis to Buenos Aires in about 14h 39m. The time it takes to get you to your destination can typically vary by up to 32h. There are 5472 mi between St. Louis and Buenos Aires. Both multi-stop and nonstop flights can be found to your destination and back.

  • What is the cheapest airline to fly from St. Louis to Buenos Aires round-trip?

    Currently priced at $1,025, Delta will fly you from St. Louis to Buenos Aires and back. In addition to Delta, many other airlines offer competitively priced options for your trip. This flight start at 20% lower than the current average price 3 months from now.

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

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

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

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

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

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

See more FAQs

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Alternative routes for St. Louis to Buenos Aires

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Ministro Pistarini flights
Kansas City to Ministro Pistarini flights
St. Louis to Jorge Newbery flights
Kansas City to Jorge Newbery flights
Kansas City to Cordoba flights

Top airline flying from St. Louis to Buenos Aires

Discover the top airline that operate flights from St. Louis to Buenos Aires. 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 January 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$1,025Average$1,377FlexibilityNo cancel feeOn-timeN/A

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