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$409+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Apr 2 — Apr 91
Wed 4/2
Wed 4/9
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 March 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,025
(Delta)

One-way from

$409
(Kiwi.com)

Popular in

February

Cheapest in

August

Average price

$1,198
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. 5% potential increase in price ($76 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 28, 2025.

This Delta deal was found by Cheapflights users on 3/27. 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.
Mon 5/195:40 pmSTL - EZE
1 stop14h 05mDelta
Mon 6/28:10 pmEZE - STL
1 stop14h 50mDelta
Deal found 3/27$1,025
This United deal was found by Cheapflights users on 3/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/144:20 pmSTL - EZE
1 stop13h 40mUnited Airlines
Mon 4/219:00 pmEZE - STL
1 stop27h 09mUnited Airlines
Deal found 3/27$1,205
This Gotogate deal was found by Cheapflights users on 3/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/191:30 pmSTL - EZE
3 stops47h 00mMultiple Airlines
Mon 6/22:32 pmEZE - STL
2 stops21h 24mMultiple Airlines
Deal found 3/27$1,315
This LATAM Airlines deal was found by Cheapflights users on 3/27. 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.
Mon 4/147:01 pmSTL - AEP
2 stops24h 29mLATAM Airlines
Mon 4/218:10 pmAEP - STL
2 stops29h 26mLATAM Airlines
Deal found 3/27$1,450
This LATAM Airlines deal was found by Cheapflights users on 3/27. 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.
Mon 4/1410:42 amSTL - EZE
2 stops17h 28mLATAM Airlines
Sun 4/203:55 amEZE - STL
2 stops21h 41mLATAM Airlines
Deal found 3/27$1,450
This Avianca deal was found by Cheapflights users on 3/27. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/199:40 amSTL - EZE
2 stops18h 05mAvianca
Sun 6/11:40 amEZE - STL
2 stops18h 20mAvianca
Deal found 3/27$4,923

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 March 28, 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

Mon 5/19

5:40 pm-9:45 am

1 stop14h 05m

Buenos Aires Ministro Pistarini

Mon 6/2

8:10 pm-9:00 am

1 stop14h 50m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 4/14

4:20 pm-8:00 am

1 stop13h 40m

Buenos Aires Ministro Pistarini

Mon 4/21

9:00 pm-10:09 pm

1 stop27h 09m

$1,205

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 5/19

1:30 pm-2:30 pm

3 stops47h 00m

Buenos Aires Ministro Pistarini

Mon 6/2

2:32 pm-9:56 am

2 stops21h 24m

$1,315

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Mon 4/14

7:01 pm-9:30 pm

2 stops24h 29m

Buenos Aires Jorge Newbery

Mon 4/21

8:10 pm-11:36 pm

2 stops29h 26m

$1,450

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 4/14

10:42 am-6:10 am

2 stops17h 28m

Buenos Aires Ministro Pistarini

Sun 4/20

3:55 am-11:36 pm

2 stops21h 41m

$1,450

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 5/19

9:40 am-5:45 am

2 stops18h 05m

Buenos Aires Ministro Pistarini

Sun 6/1

1:40 am-6:00 pm

2 stops18h 20m

$4,923

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 5/4

5:45 pm-3:20 pm

3 stops43h 35m

$409

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 5/4

4:16 pm-9:45 am

1 stop15h 29m

$758

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

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 March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star

*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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Buenos Aires flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 month to book a flight from St. Louis to Buenos Aires?

Currently, April is the cheapest month in which you can book a flight from St. Louis to Buenos Aires (average of $795). Flying from St. Louis to Buenos Aires in December is currently the most expensive (average of $1,260). 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 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 March 28, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 16% on flights from St. Louis to Buenos Aires by exploring options for tickets in the evening.

Rainfall in Buenos Aires by month

Plan your trip to Buenos Aires by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Buenos Aires ranges from 2.0 - 3.9 inches per month. January is typically the wettest month, when rainfall can reach 3.9 in. June is typically the driest time to visit Buenos Aires when rainfall is around 2.0 in.

Temperature in Buenos Aires by month

Plan your trip to Buenos Aires by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Buenos Aires, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of June, when temperatures are typically at their lowest (around 51.8 F).

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 March 28, 2025.
Delta
8.0
Very good
7,896 reviews

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,896 reviews
Delta
8.0
Very good
7,896 reviews

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
LATAM Airlines
7.5
Good
1,750 reviews
Delta
8.0
Very good
7,896 reviews

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,603 reviews
Delta
8.0
Very good
7,896 reviews

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Avianca
6.7
Okay
2,300 reviews
Delta
8.0
Very good
7,896 reviews

Crew

8.5

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

8.0

Boarding

8.2

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.

  • What are the cheapest airlines flying 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. Search Cheapflights for deals from United Airlines and LATAM Airlines - these airlines can fly you to your destination from $1,205 and $1,450, respectively. These flights start at 18% 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.

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

    Currently, April is the cheapest month in which you can book a flight from St. Louis to Buenos Aires (average of $795). Flying from St. Louis to Buenos Aires in December is currently the most expensive (average of $1,260). 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

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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
St. Louis to Jorge Newbery flights
Kansas City to Jorge Newbery flights
St. Louis to Ministro Pistarini 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 March 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$814Average$1,203FlexibilityNo cancel feeOn-time69%
DeltaCheapest$1,023Average$1,283FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$1,025Average$1,238FlexibilityNo cancel feeOn-time71%
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