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

Currently priced at $1,013, 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 LATAM Airlines and Delta - these airlines can fly you to your destination from $1,025 and $1,025, respectively. These flights start at 19% lower than the current average price 3 months from now.

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

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

What are the most popular airlines that fly from St. Louis to Buenos Aires?

Consider American Airlines, Delta or United Airlines when booking your flight. These represent the most popular airlines when flying from St. Louis to Buenos Aires.

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

Thursday flights are generally found to be more expensive for flights from St. Louis to Buenos Aires. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Buenos Aires.

What is the cheapest month to fly from St. Louis to Buenos Aires?

August is one of the best times of the year to fly to Buenos Aires from St. Louis. Prices for August average $1,263 per person but you can even find prices for as low as $999. The most expensive prices can be found in the month of November. Opting for a August flight can save you 15% on your journey compared to booking in November

Most accurate provider : When it comes to deals on St. Louis-Buenos Aires flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-Buenos Aires flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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.

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.

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.

$1,013+ Flights from St. Louis to Buenos Aires

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Cheap flight deals from St. Louis to Buenos Aires

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$1,013 (American Airlines)
Popular in	November
Cheapest in	August
Average price	$1,175

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

Highest demand for flights based on searches. 7% potential increase in price ($96 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($19 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 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 April 17, 2025.

Mon 6/92:49 pmSTL - EZE

1 stop17h 26mAmerican Airlines

Mon 6/239:15 pmEZE - STL

1 stop19h 04mAmerican Airlines

Deal found 4/16

$1,013

Wed 9/103:30 pmSTL - AEP

2 stops22h 30mLATAM Airlines

Wed 9/175:00 pmAEP - STL

2 stops19h 40mLATAM Airlines

Deal found 4/17

$1,025

Wed 9/103:30 pmSTL - EZE

2 stops18h 18mLATAM Airlines

Wed 9/177:35 amEZE - STL

2 stops18h 04mLATAM Airlines

Deal found 4/17

$1,025

Wed 9/105:30 pmSTL - EZE

2 stops36h 30mUnited Airlines

Wed 9/179:00 pmEZE - STL

1 stop23h 58mUnited Airlines

Deal found 4/17

$1,030

Wed 5/71:30 pmSTL - EZE

2 stops23h 00mAir Canada

Wed 5/214:35 pmEZE - STL

3 stops29h 23mAir Canada

Deal found 4/16

$1,032

Sun 6/151:30 pmSTL - EZE

1 stop18h 15mDelta

Tue 6/248:10 pmEZE - STL

1 stop14h 13mDelta

Deal found 4/15

$1,065

Mon 6/98:10 amSTL - EZE

2 stops22h 04mCopa Airlines

Sun 6/2212:06 amEZE - STL

2 stops21h 31mCopa Airlines

Deal found 4/16

$1,131

Wed 5/78:25 amSTL - EZE

2 stops28h 55mMultiple Airlines

Tue 5/202:30 amEZE - STL

2 stops32h 45mMultiple Airlines

Deal found 4/16

$1,162

Sun 6/110:10 amSTL - AEP

3 stops32h 15mMultiple Airlines

Sun 6/84:55 amAEP - STL

3 stops33h 41mMultiple Airlines

Deal found 4/16

$1,357

Wed 9/105:31 amSTL - AEP

2 stops29h 29mGOL

Tue 9/163:40 amAEP - STL

2 stops21h 21mGOL

Deal found 4/17

$1,452

Sat 12/134:35 pmSTL - EZE

2 stops16h 45mGOL

Fri 1/93:15 amEZE - STL

2 stops21h 33mGOL

Deal found 4/17

$2,603

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 April 17, 2025.

Mon 6/92:49 pmSTL - EZE

1 stop17h 26mAmerican Airlines

Mon 6/239:15 pmEZE - STL

1 stop19h 04mAmerican Airlines

Deal found 4/16

$1,013

Wed 9/103:30 pmSTL - AEP

2 stops22h 30mLATAM Airlines

Wed 9/175:00 pmAEP - STL

2 stops19h 40mLATAM Airlines

Deal found 4/17

$1,025

Wed 9/103:30 pmSTL - EZE

1 stop16h 15mDelta

Wed 9/178:10 pmEZE - STL

1 stop16h 30mDelta

Deal found 4/17

$1,025

Wed 9/105:30 pmSTL - EZE

2 stops36h 30mUnited Airlines

Wed 9/179:00 pmEZE - STL

1 stop23h 58mUnited Airlines

Deal found 4/17

$1,030

Wed 5/71:30 pmSTL - EZE

2 stops23h 00mAir Canada

Wed 5/214:35 pmEZE - STL

3 stops29h 23mAir Canada

Deal found 4/16

$1,032

Mon 6/98:10 amSTL - EZE

2 stops22h 04mCopa Airlines

Sun 6/2212:06 amEZE - STL

2 stops21h 31mCopa Airlines

Deal found 4/16

$1,131

Wed 5/78:25 amSTL - EZE

2 stops28h 55mMultiple Airlines

Tue 5/202:30 amEZE - STL

2 stops32h 45mMultiple Airlines

Deal found 4/16

$1,162

Wed 9/105:31 amSTL - AEP

2 stops29h 29mGOL

Tue 9/163:40 amAEP - STL

2 stops21h 21mGOL

Deal found 4/17

$1,452

Thu 9/411:51 amSTL - EZE

2 stops16h 04mLATAM Airlines

Fri 9/127:40 amEZE - STL

2 stops29h 00mLATAM Airlines

Deal found 4/16

$1,070

Sun 6/110:10 amSTL - AEP

3 stops32h 15mMultiple Airlines

Sun 6/84:55 amAEP - STL

3 stops33h 41mMultiple Airlines

Deal found 4/16

$1,357

Last-minute flights from St. Louis to Buenos Aires
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 17, 2025 and is based on user searches.

Thu 4/1710:42 amSTL - EZE

2 stops37h 48mLATAM Airlines

Thu 4/2412:00 pmEZE - STL

2 stops31h 56mLATAM Airlines

Deal found 4/17

$1,273

Wed 4/304:17 pmSTL - EZE

1 stop15h 28mDelta

Mon 5/128:10 pmEZE - STL

1 stop20h 25mDelta

Deal found 4/16

$1,195

Wed 5/71:30 pmSTL - EZE

2 stops23h 00mAir Canada

Wed 5/214:35 pmEZE - STL

3 stops29h 23mAir Canada

Deal found 4/16

$1,032

Wed 5/78:25 amSTL - EZE

2 stops28h 55mMultiple Airlines

Tue 5/202:30 amEZE - STL

2 stops32h 45mMultiple Airlines

Deal found 4/16

$1,162

Wed 5/73:40 pmSTL - AEP

2 stops18h 00mLATAM Airlines

Wed 5/216:20 pmAEP - STL

2 stops19h 44mLATAM Airlines

Deal found 4/16

$1,195

Wed 5/78:25 amSTL - AEP

2 stops19h 15mMultiple Airlines

Tue 5/203:40 amAEP - STL

2 stops20h 39mMultiple Airlines

Deal found 4/16

$1,793

Wed 5/216:00 amSTL - EZE

1 stop24h 00mUnited Airlines

Wed 5/289:00 pmEZE - STL

1 stop21h 53mUnited Airlines

Deal found 4/15

$1,175

Wed 5/211:38 pmSTL - EZE

2 stops18h 37mAmerican Airlines

Wed 5/2810:30 pmEZE - STL

2 stops18h 25mAmerican Airlines

Deal found 4/15

$1,180

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/9

2:49 pm-10:15 am

1 stop17h 26m

Buenos Aires Ministro Pistarini

Mon 6/23

9:15 pm-2:19 pm

1 stop19h 04m

$1,013

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 9/10

3:30 pm-4:00 pm

2 stops22h 30m

Buenos Aires Jorge Newbery

Wed 9/17

5:00 pm-10:40 am

2 stops19h 40m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 9/10

3:30 pm-9:45 am

1 stop16h 15m

Buenos Aires Ministro Pistarini

Wed 9/17

8:10 pm-10:40 am

1 stop16h 30m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 9/10

5:30 pm-8:00 am

2 stops36h 30m

Buenos Aires Ministro Pistarini

Wed 9/17

9:00 pm-6:58 pm

1 stop23h 58m

$1,030

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 5/7

1:30 pm-2:30 pm

2 stops23h 00m

Buenos Aires Ministro Pistarini

Wed 5/21

4:35 pm-7:58 pm

3 stops29h 23m

$1,032

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 9/4

11:51 am-5:55 am

2 stops16h 04m

Buenos Aires Ministro Pistarini

Fri 9/12

7:40 am-10:40 am

2 stops29h 00m

$1,070

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/9

8:10 am-8:14 am

2 stops22h 04m

Buenos Aires Ministro Pistarini

Sun 6/22

12:06 am-7:37 pm

2 stops21h 31m

$1,131

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 5/7

8:25 am-3:20 pm

2 stops28h 55m

Buenos Aires Ministro Pistarini

Tue 5/20

2:30 am-9:15 am

2 stops32h 45m

$1,162

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 6/1

10:10 am-8:25 pm

3 stops32h 15m

Buenos Aires Jorge Newbery

Sun 6/8

4:55 am-12:36 pm

3 stops33h 41m

$1,357

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 9/10

5:31 am-1:00 pm

2 stops29h 29m

Buenos Aires Jorge Newbery

Tue 9/16

3:40 am-11:01 pm

2 stops21h 21m

$1,452

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Compare providers for flights from St. Louis to Buenos Aires

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 April.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-Buenos Aires flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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?

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

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

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

Delta

8.0

Very good

7,916 reviews

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

7,916 reviews

Delta

8.0

Very good

7,916 reviews

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.

Copa Airlines

7.6

Good

1,409 reviews

Delta

8.0

Very good

7,916 reviews

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

1,761 reviews

Delta

8.0

Very good

7,916 reviews

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

8,667 reviews

Delta

8.0

Very good

7,916 reviews

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.

GOL

7.3

Good

1,059 reviews

Delta

8.0

Very good

7,916 reviews

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

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 $1,013, 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 LATAM Airlines and Delta - these airlines can fly you to your destination from $1,025 and $1,025, 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.
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

Top 3 airlines flying from St. Louis to Buenos Aires

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$1,023	Average$1,263	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$1,025	Average$1,238	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$1,053	Average$1,223	FlexibilityNo cancel fee	On-time69%

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$1,013+ 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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Buenos Aires with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Buenos Aires

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from St. Louis to Buenos Aires

Cheapest flights from St. Louis to Buenos AiresExplore 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 April 17, 2025.

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 April 17, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.

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 April.

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.

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?

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 April 17, 2025.

Rainfall in Buenos Aires by month

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

Temperature in Buenos Aires by month

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

Reviews of airlines servicing Buenos Aires

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?

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

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

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Buenos Aires

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from St. Louis to Buenos Aires

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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 April 17, 2025.