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$543+ Cheap flights from St. Louis (STL) to Buenos Aires (BUE)

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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Jan 30 — Feb 61
Fri 1/30
Fri 2/6
1 adult, Economy
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Cheap flight deals from St. Louis to Buenos Aires

Best flights from St. Louis to Buenos Aires
Discover carefully curated flight deals from St. Louis to Buenos Aires that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 31, 2025.

This KAYAK deal was found by Cheapflights users on 12/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/105:21 pmSTL - EZE
1 stop13h 39mLATAM Airlines
Tue 3/248:55 pmEZE - STL
1 stop22h 58mLATAM Airlines
Deal found 12/30$908
This Delta deal was found by Cheapflights users on 12/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/107:03 amSTL - EZE
2 stops21h 02mDelta
Tue 3/248:55 pmEZE - STL
1 stop21h 21mDelta
Deal found 12/30$936
This American Airlines deal was found by Cheapflights users on 12/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/217:03 amSTL - EZE
1 stop23h 17mAmerican Airlines
Mon 3/3011:30 pmEZE - STL
1 stop20h 10mAmerican Airlines
Deal found 12/30$1,021
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1012:04 pmSTL - AEP
3 stops21h 41mLATAM Airlines
Tue 3/245:15 pmAEP - STL
2 stops19h 54mLATAM Airlines
Deal found 12/29$936
This Delta deal was found by Cheapflights users on 12/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/812:04 pmSTL - EZE
2 stops20h 11mDelta
Tue 3/1710:25 pmEZE - STL
2 stops19h 51mDelta
Deal found 12/29$1,025
This KAYAK deal was found by Cheapflights users on 12/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:59 pmSTL - AEP
2 stops20h 01mLATAM Airlines
Tue 3/173:40 pmAEP - STL
2 stops19h 25mLATAM Airlines
Deal found 12/30$1,013
This LATAM Airlines deal was found by Cheapflights users on 12/29. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2610:13 amSTL - EZE
1 stop19h 47mDelta
Thu 3/58:55 pmEZE - STL
1 stop15h 11mDelta
Deal found 12/29$1,026
This American Airlines deal was found by Cheapflights users on 12/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/2810:00 amSTL - EZE
1 stop18h 10mAmerican Airlines
Sat 2/289:25 pmEZE - STL
1 stop16h 07mAmerican Airlines
Deal found 12/29$1,141
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/84:21 pmSTL - EZE
1 stop14h 39mLATAM Airlines
Tue 3/178:55 pmEZE - STL
1 stop22h 58mLATAM Airlines
Deal found 12/29$1,013
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/263:47 pmSTL - EZE
2 stops20h 08mLATAM Airlines
Thu 3/52:45 pmEZE - STL
2 stops23h 17mLATAM Airlines
Deal found 12/29$1,018
This LATAM Airlines deal was found by Cheapflights users on 12/30. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/215:00 pmSTL - EZE
1 stop14h 00mLATAM Airlines
Mon 3/307:35 amEZE - STL
2 stops18h 23mLATAM Airlines
Deal found 12/30$1,021
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/263:47 pmSTL - AEP
2 stops21h 13mLATAM Airlines
Thu 3/55:15 pmAEP - STL
2 stops18h 51mLATAM Airlines
Deal found 12/29$1,188
This KAYAK deal was found by Cheapflights users on 12/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/812:00 pmSTL - AEP
2 stops18h 40mLATAM Airlines
Mon 1/263:40 pmAEP - STL
2 stops20h 13mLATAM Airlines
Deal found 12/30$1,200
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/146:00 amSTL - AEP
2 stops22h 55mLATAM Airlines
Sat 1/243:40 pmAEP - STL
2 stops20h 13mLATAM Airlines
Deal found 12/29$1,233
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/1712:00 pmSTL - AEP
2 stops23h 40mLATAM Airlines
Sun 1/253:40 pmAEP - STL
2 stops29h 10mLATAM Airlines
Deal found 12/29$1,258
This LATAM Airlines deal was found by Cheapflights users on 12/29. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1210:13 amSTL - AEP
2 stops18h 42mLATAM Airlines
Thu 2/1912:40 pmAEP - STL
3 stops25h 22mLATAM Airlines
Deal found 12/29$1,326
This FlightHub deal was found by Cheapflights users on 12/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/215:00 pmSTL - AEP
2 stops19h 40mLATAM Airlines
Mon 3/305:05 pmAEP - STL
2 stops20h 04mLATAM Airlines
Deal found 12/30$1,369
This KAYAK deal was found by Cheapflights users on 12/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/75:00 pmSTL - AEP
2 stops21h 00mLATAM Airlines
Wed 1/143:40 pmAEP - STL
2 stops22h 25mLATAM Airlines
Deal found 12/29$1,418

Find 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 December 31, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$936
(KAYAK)

One-way from

$543
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$1,377
Provider with most accurate pricing for Lambert-St Louis-Buenos Aires (BUE) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Buenos Aires (BUE) flights.
Search Deals
From Lambert-St Louis to Buenos Aires (BUE)
Search Deals
One-way flight from Lambert-St Louis to Buenos Aires (BUE)
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 31, 2025.
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

Tue 3/10

5:21 pm-9:00 am

1 stop13h 39m

Buenos Aires Ministro Pistarini

Tue 3/24

8:55 pm-5:53 pm

1 stop22h 58m

$908

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/10

7:03 am-6:05 am

2 stops21h 02m

Buenos Aires Ministro Pistarini

Tue 3/24

8:55 pm-4:16 pm

1 stop21h 21m

$936

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 3/10

12:04 pm-11:45 am

3 stops21h 41m

Buenos Aires Jorge Newbery

Tue 3/24

5:15 pm-11:09 am

2 stops19h 54m

$936

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

6:59 pm-5:00 pm

2 stops20h 01m

Buenos Aires Jorge Newbery

Tue 3/17

3:40 pm-9:05 am

2 stops19h 25m

$1,013

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

8:55 pm-5:53 pm

1 stop22h 58m

$1,013

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 2/26

3:47 pm-2:55 pm

2 stops20h 08m

Buenos Aires Ministro Pistarini

Thu 3/5

2:45 pm-11:02 am

2 stops23h 17m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 3/21

7:03 am-8:20 am

1 stop23h 17m

Buenos Aires Ministro Pistarini

Mon 3/30

11:30 pm-5:40 pm

1 stop20h 10m

$1,021

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 3/21

5:00 pm-9:00 am

1 stop14h 00m

Buenos Aires Ministro Pistarini

Mon 3/30

7:35 am-11:58 pm

2 stops18h 23m

$1,021

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

12:04 pm-10:15 am

2 stops20h 11m

Buenos Aires Ministro Pistarini

Tue 3/17

10:25 pm-4:16 pm

2 stops19h 51m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 2/26

10:13 am-9:00 am

1 stop19h 47m

Buenos Aires Ministro Pistarini

Thu 3/5

8:55 pm-9:06 am

1 stop15h 11m

$1,026

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/30

Showing 1-10 of 22 results
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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 December.
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 December 31, 2025.
Get a feel of what it's like to fly with Delta, LATAM Airlines, and United 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
8,016 reviews

Comfort

7.9

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

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
8,016 reviews
Delta
7.9
Good
8,016 reviews

Comfort

7.9

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

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
1,896 reviews
Delta
7.9
Good
8,016 reviews

Comfort

7.9

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

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.
United Airlines
7.4
Good
9,124 reviews
Delta
7.9
Good
8,016 reviews

Comfort

7.9

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

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
11,074 reviews
Delta
7.9
Good
8,016 reviews

Comfort

7.9

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Crew

8.5

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 LATAM Airlines and Delta fly from St. Louis to Buenos Aires in about 13h 39m. The time it takes to get you to your destination can typically vary by up to 7h 23m. 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 21% 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.
Kansas City to Ministro Pistarini flights
Kansas City to Jorge Newbery flights
St. Louis to Ministro Pistarini flights
St. Louis 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 December 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$1,025Average$1,377FlexibilityNo cancel feeOn-timeN/A

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