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$383+ 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 12/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
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 November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$880
(LATAM Airlines)

One-way from

$383
(Kiwi.com)

Popular in

August

Cheapest in

September

Average price

$1,355
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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One-way flight from Lambert-St Louis to Buenos Aires (BUE)
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Highest demand for flights based on searches. 1% potential increase in price ($13 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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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 November 13, 2025.

This Kiwi.com deal was found by Cheapflights users on 11/13. 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 12/136:00 amSTL - EZE
1 stop34h 30mMultiple Airlines
Mon 2/911:00 amEZE - STL
2 stops50h 02mMultiple Airlines
Deal found 11/13$1,104
This Mytrip deal was found by Cheapflights users on 11/11. 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.
Thu 11/2710:53 amSTL - EZE
2 stops18h 06mMultiple Airlines
Mon 12/110:42 amEZE - STL
2 stops31h 47mMultiple Airlines
Deal found 11/11$1,138
This United Airlines deal was found by Cheapflights users on 11/13. 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.
Sat 12/136:15 amSTL - EZE
1 stop22h 05mUnited Airlines
Mon 2/910:05 pmEZE - STL
1 stop14h 17mUnited Airlines
Deal found 11/13$1,141
This United Airlines deal was found by Cheapflights users on 11/11. 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 12/14:35 pmSTL - EZE
1 stop13h 45mUnited Airlines
Sun 2/2210:05 pmEZE - STL
1 stop20h 33mUnited Airlines
Deal found 11/11$1,161
This KAYAK deal was found by Cheapflights users on 11/12. 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 11/189:33 amSTL - AEP
2 stops19h 22mLATAM Airlines
Wed 11/266:20 pmAEP - STL
2 stops18h 39mLATAM Airlines
Deal found 11/12$1,208
This KAYAK deal was found by Cheapflights users on 11/11. 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 11/189:33 amSTL - EZE
2 stops17h 32mLATAM Airlines
Wed 11/267:43 pmEZE - STL
2 stops25h 52mLATAM Airlines
Deal found 11/11$1,208
This Delta deal was found by Cheapflights users on 11/13. 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 11/189:33 amSTL - EZE
2 stops17h 32mDelta
Wed 11/268:55 pmEZE - STL
1 stop20h 01mDelta
Deal found 11/13$1,216
This FlightHub deal was found by Cheapflights users on 11/11. 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.
Mon 12/11:55 pmSTL - EZE
2 stops16h 40mLATAM Airlines
Sat 2/214:05 amEZE - STL
2 stops22h 33mLATAM Airlines
Deal found 11/11$1,218
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Wed 11/1210:00 amSTL - EZE
2 stops20h 20mUnited Airlines
Wed 11/1910:05 pmEZE - STL
1 stop15h 34mUnited Airlines
Deal found 11/11$1,220
This KAYAK deal was found by Cheapflights users on 11/11. 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.
Mon 12/15:17 pmSTL - AEP
2 stops17h 43mLATAM Airlines
Sun 2/225:15 pmAEP - STL
2 stops18h 53mLATAM Airlines
Deal found 11/11$1,233
This Orbitz deal was found by Cheapflights users on 11/13. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/135:12 pmSTL - EZE
2 stops30h 38mLATAM Airlines
Sun 2/84:05 amEZE - STL
2 stops22h 34mLATAM Airlines
Deal found 11/13$1,246
This Delta deal was found by Cheapflights users on 11/12. 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.
Sat 12/131:35 pmSTL - EZE
1 stop14h 45mDelta
Sun 12/218:55 pmEZE - STL
1 stop22h 33mDelta
Deal found 11/12$1,256

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 November 13, 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

Sun 3/8

11:51 am-10:15 am

2 stops20h 24m

Buenos Aires Ministro Pistarini

Tue 3/17

10:25 pm-4:01 pm

2 stops19h 36m

$884

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 3/11

6:00 am-6:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Mon 3/23

9:05 pm-9:24 am

1 stop14h 19m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 2/11

5:04 pm-9:00 am

1 stop12h 56m

Buenos Aires Ministro Pistarini

Mon 3/9

8:55 pm-9:04 am

1 stop14h 09m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 2/10

4:35 pm-9:20 am

1 stop13h 45m

Buenos Aires Ministro Pistarini

Thu 3/5

11:55 pm-3:54 pm

1 stop18h 59m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 2/10

5:04 pm-6:05 am

2 stops34h 01m

Buenos Aires Ministro Pistarini

Mon 3/9

8:00 am-11:40 pm

2 stops17h 40m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 2/9

7:10 am-9:00 am

1 stop22h 50m

Buenos Aires Ministro Pistarini

Mon 3/9

11:55 pm-4:01 pm

1 stop18h 06m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 2/11

5:04 pm-9:00 am

1 stop12h 56m

Buenos Aires Ministro Pistarini

Tue 3/3

8:55 pm-11:04 am

1 stop17h 09m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 2/9

3:45 pm-9:00 am

1 stop14h 15m

Buenos Aires Ministro Pistarini

Tue 3/3

4:05 am-9:08 am

2 stops32h 03m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 3/11

10:00 am-6:05 am

2 stops18h 05m

Buenos Aires Ministro Pistarini

Mon 3/23

8:55 pm-4:01 pm

1 stop21h 06m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 2/11

9:59 am-7:20 am

1 stop18h 21m

Buenos Aires Ministro Pistarini

Wed 3/4

8:55 pm-11:04 am

1 stop17h 09m

$1,026

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/13

Showing 1-10 of 33 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 November.
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

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

Find hourly flight availability from St. Louis to Buenos Aires. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 13, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 8% on flights from St. Louis to Buenos Aires by exploring options for tickets at noon.

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 November 13, 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
8,007 reviews

Boarding

8.1

Comfort

7.9

Food

7.3

Overall

7.9

Entertainment

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
8,007 reviews
Delta
7.9
Good
8,007 reviews

Boarding

8.1

Comfort

7.9

Food

7.3

Overall

7.9

Entertainment

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
1,875 reviews
Delta
7.9
Good
8,007 reviews

Boarding

8.1

Comfort

7.9

Food

7.3

Overall

7.9

Entertainment

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
9,015 reviews
Delta
7.9
Good
8,007 reviews

Boarding

8.1

Comfort

7.9

Food

7.3

Overall

7.9

Entertainment

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
11,050 reviews
Delta
7.9
Good
8,007 reviews

Boarding

8.1

Comfort

7.9

Food

7.3

Overall

7.9

Entertainment

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 3 different airlines.

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

    Airlines like Delta, United Airlines, and LATAM Airlines fly from St. Louis to Buenos Aires in about 17h 40m. The time it takes to get you to your destination can typically vary by up to 4h 40m. There are 5458 mi between St. Louis and Buenos Aires. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from St. Louis to Buenos Aires round-trip?

    Currently priced at $1,023, American Airlines will fly you from St. Louis to Buenos Aires and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $1,025 and $1,081, respectively. These flights start at 19% 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 3 airlines flying from St. Louis to Buenos Aires

Discover the top 3 airlines 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$1,023Average$1,287FlexibilityNo cancel feeOn-time71%
DeltaCheapest$1,025Average$1,291FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$1,081Average$1,406FlexibilityNo cancel feeOn-time69%

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