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Buenos Aires

$370+ 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
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 December 9, 2025.

This United Airlines deal was found by Cheapflights users on 12/9. 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 12/154:45 pmSTL - EZE
1 stop13h 35mUnited Airlines
Mon 12/2210:05 pmEZE - STL
1 stop14h 44mUnited Airlines
Deal found 12/9$1,216
This Mytrip deal was found by Cheapflights users on 12/6. 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.
Wed 12/104:05 pmSTL - EZE
3 stops32h 40mMultiple Airlines
Fri 12/124:45 pmEZE - STL
2 stops25h 44mMultiple Airlines
Deal found 12/6$1,311
This Mytrip deal was found by Cheapflights users on 12/6. 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.
Wed 12/104:05 pmSTL - AEP
3 stops34h 35mMultiple Airlines
Fri 12/1212:40 pmAEP - STL
2 stops29h 49mMultiple Airlines
Deal found 12/6$1,432
This Kiwi.com deal was found by Cheapflights users on 12/8. 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.
Fri 12/121:57 pmSTL - EZE
1 stop14h 23mMultiple Airlines
Sun 12/146:15 amEZE - STL
3 stops43h 18mMultiple Airlines
Deal found 12/8$1,548
This LATAM Airlines deal was found by Cheapflights users on 12/8. 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.
Fri 12/129:30 amSTL - EZE
1 stop18h 50mDelta
Sun 12/148:55 pmEZE - STL
1 stop19h 07mDelta
Deal found 12/8$1,566
This United Airlines deal was found by Cheapflights users on 12/8. 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.
Fri 12/121:00 pmSTL - EZE
2 stops17h 20mUnited Airlines
Sun 12/1411:55 pmEZE - STL
1 stop19h 09mUnited Airlines
Deal found 12/8$1,570
This SmartFares deal was found by Cheapflights users on 12/6. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/109:30 amSTL - EZE
2 stops38h 20mLATAM Airlines
Fri 12/1212:15 pmEZE - STL
2 stops25h 09mLATAM Airlines
Deal found 12/6$1,572
This LATAM Airlines deal was found by Cheapflights users on 12/6. 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 12/86:00 amSTL - AEP
3 stops26h 45mLATAM Airlines
Fri 12/128:50 amAEP - STL
2 stops36h 10mLATAM Airlines
Deal found 12/6$1,628
This LATAM Airlines deal was found by Cheapflights users on 12/7. 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 12/86:00 amSTL - EZE
2 stops21h 20mLATAM Airlines
Fri 12/127:43 pmEZE - STL
2 stops25h 17mLATAM Airlines
Deal found 12/7$1,628
This KAYAK deal was found by Cheapflights users on 12/6. 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.
Wed 12/105:28 pmSTL - AEP
2 stops19h 32mLATAM Airlines
Fri 12/125:15 pmAEP - STL
2 stops20h 09mLATAM Airlines
Deal found 12/6$1,740
This United Airlines deal was found by Cheapflights users on 12/6. 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 12/811:10 amSTL - EZE
1 stop17h 10mUnited Airlines
Fri 12/1211:55 pmEZE - STL
1 stop19h 09mUnited Airlines
Deal found 12/6$1,748
This FlightHub deal was found by Cheapflights users on 12/8. 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.
Fri 12/121:57 pmSTL - AEP
2 stops17h 33mLATAM Airlines
Sun 12/145:15 pmAEP - STL
2 stops20h 30mLATAM Airlines
Deal found 12/8$1,765

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 December 9, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,048
(FlightHub)

One-way from

$370
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$1,337
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
One-way flight from Lambert-St Louis to Buenos Aires (BUE)
Search Deals
Highest demand for flights based on searches. 4% potential increase in price ($57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 9, 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

3:58 pm-9:35 am

2 stops15h 37m

Buenos Aires Ministro Pistarini

Tue 3/17

4:05 am-11:42 pm

2 stops21h 37m

$1,048

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

10:02 am-7:55 am

2 stops19h 53m

Buenos Aires Jorge Newbery

Tue 3/17

11:30 am-11:45 am

2 stops26h 15m

$1,058

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 2/7

1:00 pm-4:00 pm

2 stops24h 00m

Buenos Aires Jorge Newbery

Sun 2/15

5:15 pm-9:06 am

2 stops18h 51m

$1,098

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 2/7

9:59 am-9:00 am

1 stop20h 01m

Buenos Aires Ministro Pistarini

Sun 2/15

8:55 pm-9:06 am

1 stop15h 11m

$1,098

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 4/2

6:00 am-8:35 am

2 stops24h 35m

Buenos Aires Ministro Pistarini

Sat 4/11

1:20 pm-5:53 pm

2 stops30h 33m

$1,100

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 1/8

6:00 am-7:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Mon 1/26

11:55 pm-3:52 pm

1 stop18h 57m

$1,101

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 2/13

3:47 pm-7:20 am

1 stop12h 33m

Buenos Aires Ministro Pistarini

Sat 2/28

11:55 pm-11:02 am

1 stop14h 07m

$1,106

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 1/8

9:59 am-7:55 am

2 stops18h 56m

Buenos Aires Jorge Newbery

Mon 1/26

11:30 am-8:53 am

2 stops24h 23m

$1,160

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 1/7

5:00 pm-7:40 pm

2 stops23h 40m

Buenos Aires Jorge Newbery

Thu 1/22

5:15 pm-8:53 am

2 stops18h 38m

$1,176

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 1/23

4:05 pm-3:40 am

3 stops32h 35m

Buenos Aires Jorge Newbery

Fri 1/30

2:30 pm-3:29 pm

2 stops27h 59m

$1,285

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 27 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 December.
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 December 9, 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 December 9, 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
8,009 reviews

Crew

8.5

Food

7.3

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Overall

7.9

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
8,009 reviews
Delta
7.9
Good
8,009 reviews

Crew

8.5

Food

7.3

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Overall

7.9

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
1,889 reviews
Delta
7.9
Good
8,009 reviews

Crew

8.5

Food

7.3

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Overall

7.9

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
9,088 reviews
Delta
7.9
Good
8,009 reviews

Crew

8.5

Food

7.3

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Overall

7.9

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
11,043 reviews
Delta
7.9
Good
8,009 reviews

Crew

8.5

Food

7.3

Boarding

8.1

Comfort

7.9

Entertainment

7.9

Overall

7.9

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 fly from St. Louis to Buenos Aires in about 15h 37m. The time it takes to get you to your destination can typically vary by up to . There are 5472 mi between St. Louis and Buenos Aires.

  • 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

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.
St. Louis to Ministro Pistarini flights
St. Louis to Jorge Newbery flights
Kansas City to Ministro Pistarini flights
Kansas City 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 December 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$1,025Average$1,377FlexibilityNo cancel feeOn-timeN/A

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