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

Currently priced at $965, GOL will fly you from St. Louis to Buenos Aires and back. In addition to GOL, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on LATAM Airlines for as low as $1,018. These flights start at 25% lower than the current average price 3 months from now.

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 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.

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.

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).

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?

June is one of the best times of the year to fly to Buenos Aires from St. Louis. Prices for June average $1,303 per person but you can even find prices for as low as $1,053. The most expensive prices can be found in the month of October. Opting for a June flight can save you 30% on your journey compared to booking in October

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.

$384+ Flights from St. Louis to Buenos Aires

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Cheap flight deals from St. Louis to Buenos Aires

Round-trip from	$875 (Avianca)
One-way from	$384 (Kiwi.com)
Popular in	October
Cheapest in	June
Average price	$1,423

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. 9% potential increase in price ($132 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($37 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 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 August 11, 2025.

Thu 9/49:17 amSTL - EZE

2 stops18h 28mMultiple Airlines

Thu 9/111:40 amEZE - STL

2 stops18h 43mMultiple Airlines

Deal found 8/10

$875

Tue 11/184:21 pmSTL - EZE

2 stops17h 29mGOL

Tue 11/253:30 amEZE - STL

2 stops22h 02mGOL

Deal found 8/10

$965

Tue 11/181:30 pmSTL - AEP

2 stops18h 00mLATAM Airlines

Wed 11/265:15 pmAEP - STL

2 stops19h 50mLATAM Airlines

Deal found 8/10

$1,018

Mon 9/296:15 amSTL - EZE

1 stop23h 45mUnited Airlines

Mon 10/139:00 pmEZE - STL

1 stop27h 00mUnited Airlines

Deal found 8/10

$1,018

Mon 9/299:19 amSTL - EZE

1 stop22h 26mDelta

Mon 10/136:15 amEZE - STL

2 stops17h 13mDelta

Deal found 8/10

$1,025

Tue 11/189:00 amSTL - EZE

1 stop21h 00mDelta

Wed 11/2610:25 pmEZE - STL

2 stops22h 37mDelta

Deal found 8/11

$1,030

Wed 9/249:15 amSTL - EZE

2 stops27h 15mAir Canada

Wed 10/14:35 pmEZE - STL

2 stops24h 43mAir Canada

Deal found 8/10

$1,059

Thu 9/2510:21 amSTL - EZE

2 stops35h 49mMultiple Airlines

Wed 10/12:30 amEZE - STL

2 stops17h 40mMultiple Airlines

Deal found 8/11

$1,086

Wed 9/248:20 amSTL - EZE

1 stop21h 40mUnited Airlines

Wed 10/19:00 pmEZE - STL

1 stop14h 52mUnited Airlines

Deal found 8/10

$1,100

Mon 12/81:30 pmSTL - AEP

2 stops24h 30mLATAM Airlines

Thu 12/115:15 pmAEP - STL

2 stops20h 31mLATAM Airlines

Deal found 8/9

$1,101

Thu 11/134:27 pmSTL - EZE

1 stop14h 48mDelta

Mon 11/177:55 amEZE - STL

2 stops18h 44mDelta

Deal found 8/11

$1,101

Mon 9/296:30 amSTL - EZE

2 stops23h 30mUnited Airlines

Wed 10/159:00 pmEZE - STL

2 stops20h 44mUnited Airlines

Deal found 8/11

$1,105

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 August 11, 2025.

Thu 9/49:17 amSTL - EZE

2 stops18h 28mMultiple Airlines

Thu 9/111:40 amEZE - STL

2 stops18h 43mMultiple Airlines

Deal found 8/10

$875

Tue 11/184:21 pmSTL - EZE

2 stops17h 29mGOL

Tue 11/253:30 amEZE - STL

2 stops22h 02mGOL

Deal found 8/10

$965

Tue 11/181:30 pmSTL - AEP

2 stops18h 00mLATAM Airlines

Wed 11/265:15 pmAEP - STL

2 stops19h 50mLATAM Airlines

Deal found 8/10

$1,018

Mon 9/296:15 amSTL - EZE

1 stop23h 45mUnited Airlines

Mon 10/139:00 pmEZE - STL

1 stop27h 00mUnited Airlines

Deal found 8/10

$1,018

Mon 9/299:19 amSTL - EZE

1 stop22h 26mDelta

Mon 10/136:15 amEZE - STL

2 stops17h 13mDelta

Deal found 8/10

$1,025

Wed 9/249:15 amSTL - EZE

2 stops27h 15mAir Canada

Wed 10/14:35 pmEZE - STL

2 stops24h 43mAir Canada

Deal found 8/10

$1,059

Tue 11/189:00 amSTL - EZE

1 stop21h 00mDelta

Wed 11/2610:25 pmEZE - STL

2 stops22h 37mDelta

Deal found 8/11

$1,030

Thu 9/2510:21 amSTL - EZE

2 stops35h 49mMultiple Airlines

Wed 10/12:30 amEZE - STL

2 stops17h 40mMultiple Airlines

Deal found 8/11

$1,086

Fri 1/1610:00 amSTL - EZE

2 stops17h 10mLATAM Airlines

Sat 1/317:55 amEZE - STL

2 stops18h 45mLATAM Airlines

Deal found 8/11

$1,098

Wed 9/248:20 amSTL - EZE

1 stop21h 40mUnited Airlines

Wed 10/19:00 pmEZE - STL

1 stop14h 52mUnited Airlines

Deal found 8/10

$1,100

Mon 12/81:30 pmSTL - AEP

2 stops24h 30mLATAM Airlines

Thu 12/115:15 pmAEP - STL

2 stops20h 31mLATAM Airlines

Deal found 8/9

$1,101

Thu 11/134:27 pmSTL - EZE

1 stop14h 48mDelta

Mon 11/177:55 amEZE - STL

2 stops18h 44mDelta

Deal found 8/11

$1,101

Last-minute flights from St. Louis to Buenos Aires
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated August 11, 2025 and is based on user searches.

Thu 9/49:17 amSTL - EZE

2 stops18h 28mMultiple Airlines

Thu 9/111:40 amEZE - STL

2 stops18h 43mMultiple Airlines

Deal found 8/10

$875

Thu 9/41:21 pmSTL - AEP

2 stops22h 39mLATAM Airlines

Fri 9/1210:55 pmAEP - STL

2 stops25h 05mLATAM Airlines

Deal found 8/10

$1,240

Wed 9/249:15 amSTL - EZE

2 stops27h 15mAir Canada

Wed 10/14:35 pmEZE - STL

2 stops24h 43mAir Canada

Deal found 8/10

$1,059

Wed 9/248:20 amSTL - EZE

1 stop21h 40mUnited Airlines

Wed 10/19:00 pmEZE - STL

1 stop14h 52mUnited Airlines

Deal found 8/10

$1,100

Wed 9/243:36 pmSTL - AEP

2 stops22h 29mLATAM Airlines

Wed 10/15:00 pmAEP - STL

2 stops18h 59mLATAM Airlines

Deal found 8/10

$1,175

Wed 9/243:36 pmSTL - EZE

2 stops18h 09mLATAM Airlines

Tue 9/303:55 amEZE - STL

2 stops32h 04mLATAM Airlines

Deal found 8/10

$1,214

Thu 9/2510:21 amSTL - EZE

2 stops35h 49mMultiple Airlines

Wed 10/12:30 amEZE - STL

2 stops17h 40mMultiple Airlines

Deal found 8/11

$1,086

Mon 9/296:15 amSTL - EZE

1 stop23h 45mUnited Airlines

Mon 10/139:00 pmEZE - STL

1 stop27h 00mUnited Airlines

Deal found 8/10

$1,018

Mon 9/299:19 amSTL - EZE

1 stop22h 26mDelta

Mon 10/136:15 amEZE - STL

2 stops17h 13mDelta

Deal found 8/10

$1,025

Mon 9/296:30 amSTL - EZE

2 stops23h 30mUnited Airlines

Wed 10/159:00 pmEZE - STL

2 stops20h 44mUnited Airlines

Deal found 8/11

$1,105

Mon 9/291:30 pmSTL - EZE

3 stops47h 00mAir Canada

Mon 10/134:35 pmEZE - STL

2 stops29h 03mAir Canada

Deal found 8/10

$1,128

Mon 9/2910:21 amSTL - EZE

1 stop16h 04mMultiple Airlines

Sun 10/122:30 amEZE - STL

2 stops33h 29mMultiple Airlines

Deal found 8/10

$1,156

One-way flights from St. Louis to Buenos Aires
Search for one-way flight options from St. Louis to Buenos Aires. Find affordable one-way fares based on user searches. Data last updated August 11, 2025.

Mon 11/32:22 pmSTL - AEP

3 stops46h 18mMultiple Airlines

Deal found 8/9

$384

Thu 9/258:05 amSTL - EZE

2 stops22h 09mCopa Airlines

Deal found 8/11

$525

Thu 12/256:00 amSTL - EZE

1 stop22h 20mUnited Airlines

Deal found 8/10

$713

Fri 12/265:45 pmSTL - AEP

2 stops35h 10mMultiple Airlines

Deal found 8/8

$727

Thu 12/256:00 amSTL - AEP

2 stops20h 40mMultiple Airlines

Deal found 8/10

$748

Thu 9/253:40 pmSTL - EZE

1 stop16h 05mDelta

Deal found 8/11

$768

Thu 9/253:40 pmSTL - AEP

2 stops20h 20mLATAM Airlines

Deal found 8/11

$769

Thu 9/251:30 pmSTL - EZE

3 stops47h 00mAir Canada

Deal found 8/11

$774

Thu 12/181:30 pmSTL - AEP

2 stops26h 10mLATAM Airlines

Deal found 8/9

$916

Thu 12/256:30 amSTL - EZE

3 stops29h 40mAir Canada

Deal found 8/10

$976

Fri 12/2610:30 amSTL - EZE

1 stop17h 50mUnited Airlines

Deal found 8/10

$1,193

Thu 12/259:53 amSTL - AEP

3 stops22h 47mLATAM Airlines

Deal found 8/10

$3,013

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

Thu 9/4

9:17 am-5:45 am

2 stops18h 28m

Buenos Aires Ministro Pistarini

Thu 9/11

1:40 am-6:23 pm

2 stops18h 43m

$875

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/18

4:21 pm-12:50 pm

2 stops17h 29m

Buenos Aires Ministro Pistarini

Tue 11/25

3:30 am-10:32 pm

2 stops22h 02m

$965

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 11/18

1:30 pm-10:30 am

2 stops18h 00m

Buenos Aires Jorge Newbery

Wed 11/26

5:15 pm-10:05 am

2 stops19h 50m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 9/29

6:15 am-8:00 am

1 stop23h 45m

Buenos Aires Ministro Pistarini

Mon 10/13

9:00 pm-10:00 pm

1 stop27h 00m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 9/29

9:19 am-9:45 am

1 stop22h 26m

Buenos Aires Ministro Pistarini

Mon 10/13

6:15 am-9:28 pm

2 stops17h 13m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/18

9:00 am-9:00 am

1 stop21h 00m

Buenos Aires Ministro Pistarini

Wed 11/26

10:25 pm-6:02 pm

2 stops22h 37m

$1,030

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 9/24

9:15 am-2:30 pm

2 stops27h 15m

Buenos Aires Ministro Pistarini

Wed 10/1

4:35 pm-3:18 pm

2 stops24h 43m

$1,059

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 9/25

10:21 am-12:10 am

2 stops35h 49m

Buenos Aires Ministro Pistarini

Wed 10/1

2:30 am-6:10 pm

2 stops17h 40m

$1,086

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 1/16

10:00 am-6:10 am

2 stops17h 10m

Buenos Aires Ministro Pistarini

Sat 1/31

7:55 am-11:40 pm

2 stops18h 45m

$1,098

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 9/24

8:20 am-8:00 am

1 stop21h 40m

Buenos Aires Ministro Pistarini

Wed 10/1

9:00 pm-9:52 am

1 stop14h 52m

$1,100

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Showing 1-10 of 34 results

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?

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.

Reviews of airlines servicing Buenos Aires

Get a feel of what it's like to fly with Delta, LATAM Airlines, and Copa 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

8.0

Very good

7,978 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,978 reviews

Delta

8.0

Very good

7,978 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

LATAM Airlines

7.5

Good

1,837 reviews

Delta

8.0

Very good

7,978 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Copa Airlines

7.5

Good

1,506 reviews

Delta

8.0

Very good

7,978 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,922 reviews

Delta

8.0

Very good

7,978 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

GOL

7.3

Good

1,092 reviews

Delta

8.0

Very good

7,978 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 $965, GOL will fly you from St. Louis to Buenos Aires and back. In addition to GOL, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on LATAM Airlines for as low as $1,018. These flights start at 25% 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$1,203	FlexibilityNo cancel fee	On-time69%

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$384+ 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 11/3. 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

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3. Compare prices and book

Cheap flight deals from St. Louis to Buenos Aires

Round-trip from

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Cheapest in

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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 August 11, 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 August 11, 2025.

Cheapflights Fare Finder

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

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 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 August 11, 2025.

Reviews of airlines servicing Buenos Aires

Get a feel of what it's like to fly with Delta, LATAM Airlines, and Copa 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.

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 August 11, 2025.