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Buenos Aires

$937+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This KAYAK deal was found by Cheapflights users on 1/28. 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 pm
STL
-
AEP
2 stops23h 19m
LATAM Airlines
Tue 3/175:15 pm
AEP
-
STL
2 stops19h 54m
LATAM Airlines
Deal found 1/28$937
This LATAM Airlines deal was found by Cheapflights users on 1/27. 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.
Tue 3/105:21 pm
STL
-
EZE
1 stop13h 39m
LATAM Airlines
Tue 3/178:55 pm
EZE
-
STL
1 stop16h 14m
LATAM Airlines
Deal found 1/27$937
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Sun 3/87:41 am
STL
-
EZE
2 stops46h 39m
United Airlines
Tue 3/179:05 pm
EZE
-
STL
1 stop14h 16m
United Airlines
Deal found 1/28$957
This FlightHub deal was found by Cheapflights users on 1/28. 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 3/167:03 am
STL
-
EZE
2 stops33h 01m
LATAM Airlines
Mon 3/237:10 am
EZE
-
STL
3 stops36h 43m
LATAM Airlines
Deal found 1/28$1,020
This Delta deal was found by Cheapflights users on 1/28. 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.
Thu 4/239:59 am
STL
-
EZE
2 stops26h 46m
Delta
Thu 4/307:45 am
EZE
-
STL
2 stops17h 49m
Delta
Deal found 1/28$1,047
This LATAM Airlines deal was found by Cheapflights users on 1/28. 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 4/236:50 pm
STL
-
AEP
2 stops19h 10m
LATAM Airlines
Thu 4/303:45 pm
AEP
-
STL
2 stops20h 49m
LATAM Airlines
Deal found 1/28$1,049
This LATAM Airlines deal was found by Cheapflights users on 1/26. 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.
Wed 4/110:12 am
STL
-
EZE
2 stops20h 23m
LATAM Airlines
Wed 4/293:55 am
EZE
-
STL
2 stops21h 39m
LATAM Airlines
Deal found 1/26$1,051
This Ovago deal was found by Cheapflights users on 1/27. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/103:42 pm
STL
-
EZE
1 stop16h 03m
LATAM Airlines
Sat 8/228:10 pm
EZE
-
STL
1 stop13h 56m
LATAM Airlines
Deal found 1/27$1,062
This KAYAK deal was found by Cheapflights users on 1/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/105:30 pm
STL
-
AEP
2 stops20h 30m
LATAM Airlines
Sat 8/223:40 pm
AEP
-
STL
2 stops21h 01m
LATAM Airlines
Deal found 1/27$1,079
This American Airlines deal was found by Cheapflights users on 1/26. 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 4/111:22 am
STL
-
EZE
1 stop17h 53m
American Airlines
Thu 4/308:25 pm
EZE
-
STL
1 stop15h 51m
American Airlines
Deal found 1/26$1,087
This Ovago deal was found by Cheapflights users on 1/27. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/84:21 pm
STL
-
EZE
1 stop12h 59m
LATAM Airlines
Tue 3/178:55 pm
EZE
-
STL
1 stop16h 14m
LATAM Airlines
Deal found 1/27$1,095
This KAYAK deal was found by Cheapflights users on 1/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/812:04 pm
STL
-
AEP
2 stops17h 51m
LATAM Airlines
Tue 3/175:15 pm
AEP
-
STL
2 stops19h 54m
LATAM Airlines
Deal found 1/27$1,099

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$937
(KAYAK)

Popular in

June

Cheapest in

September

Average price

$1,410
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. 4% potential increase in price ($63 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 January 2026
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 January 29, 2026.
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 - AEP

STLAEP

Lambert-St Louis

Tue 3/10

6:59 pm-4:00 pm

2 stops19h 01m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-11:09 am

2 stops19h 54m

$937

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/16

12:04 pm-9:00 am

1 stop18h 56m

Buenos Aires Ministro Pistarini

Mon 3/23

11:55 pm-5:53 pm

1 stop19h 58m

$937

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 3/17

4:05 am-11:58 pm

2 stops21h 53m

$937

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/16

12:04 pm-6:20 am

2 stops16h 16m

Buenos Aires Ministro Pistarini

Mon 3/23

8:55 pm-9:05 am

1 stop14h 10m

$937

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/16

4:13 pm-9:59 am

2 stops15h 46m

Buenos Aires Ministro Pistarini

Mon 3/23

8:35 pm-1:16 pm

2 stops18h 41m

$941

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:41 am-8:20 am

2 stops46h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-9:21 am

1 stop14h 16m

$957

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 4/23

9:59 am-2:45 pm

2 stops26h 46m

Buenos Aires Ministro Pistarini

Thu 4/30

7:45 am-11:34 pm

2 stops17h 49m

$1,047

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 4/1

6:59 pm-9:45 am

1 stop12h 46m

Buenos Aires Ministro Pistarini

Thu 4/30

7:35 am-11:34 pm

2 stops17h 59m

$1,047

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 4/23

6:50 pm-4:00 pm

2 stops19h 10m

Buenos Aires Jorge Newbery

Thu 4/30

3:45 pm-10:34 am

2 stops20h 49m

$1,049

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

12:04 pm-7:55 am

2 stops17h 51m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-11:09 am

2 stops19h 54m

$1,099

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 14 results
1
2
  • 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
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 January 29, 2026.
Get a feel of what it's like to fly with Delta, LATAM Airlines, and American 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
8,128 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Overall

7.9

Food

7.2

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
8,128 reviews
Delta
7.9
Good
8,128 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Overall

7.9

Food

7.2

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
1,917 reviews
Delta
7.9
Good
8,128 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Overall

7.9

Food

7.2

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
11,205 reviews
Delta
7.9
Good
8,128 reviews

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Overall

7.9

Food

7.2

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 American Airlines fly from St. Louis to Buenos Aires in about 15h 46m. The time it takes to get you to your destination can typically vary by up to 3h 15m. 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 20% 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
Kansas City to Jorge Newbery 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$1,025Average$1,390FlexibilityNo cancel feeOn-timeN/A

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