HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Buenos Aires

$468+ 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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
jul. 6 — jul. 131
dom. 7/6
dom. 7/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 julio 1, 2025.

Round-trip from

$1,004
(Avianca)

One-way from

$468
(Kiwi.com)

Popular in

October

Cheapest in

June

Average price

$1,330
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. 15% potential increase in price ($253 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($77 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

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 julio 1, 2025.

This Avianca deal was found by Cheapflights users on 7/1. 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.
mar. 11/188:25 amSTL - EZE
2 stops18h 40mMultiple Airlines
mar. 11/251:45 amEZE - STL
2 stops16h 44mMultiple Airlines
Deal found 7/1$1,004
This LATAM Airlines deal was found by Cheapflights users on 6/30. 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.
lun. 9/15:11 pmSTL - AEP
2 stops21h 49mLATAM Airlines
mié. 9/103:40 pmAEP - STL
2 stops20h 19mLATAM Airlines
Deal found 6/30$1,025
This Delta deal was found by Cheapflights users on 6/30. 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.
lun. 9/15:11 pmSTL - EZE
1 stop14h 34mDelta
mié. 9/106:00 amEZE - STL
2 stops18h 02mDelta
Deal found 6/30$1,025
This American Airlines deal was found by Cheapflights users on 6/30. 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.
mié. 10/2210:22 amSTL - EZE
2 stops19h 13mAmerican Airlines
mié. 10/2911:35 pmEZE - STL
2 stops18h 10mAmerican Airlines
Deal found 6/30$1,030
This Air Canada deal was found by Cheapflights users on 6/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/11:30 pmSTL - EZE
3 stops47h 00mAir Canada
mié. 9/104:35 pmEZE - STL
2 stops29h 22mAir Canada
Deal found 6/30$1,052
This Travelocity deal was found by Cheapflights users on 6/30. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/15:11 pmSTL - EZE
2 stops22h 59mLATAM Airlines
mar. 9/93:55 amEZE - STL
2 stops30h 15mLATAM Airlines
Deal found 6/30$1,121
This United Airlines deal was found by Cheapflights users on 6/30. 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.
jue. 8/148:00 amSTL - EZE
2 stops22h 00mUnited Airlines
dom. 8/249:00 pmEZE - STL
2 stops20h 44mUnited Airlines
Deal found 6/30$1,145
This Travelocity deal was found by Cheapflights users on 6/30. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 9/14:00 pmSTL - AEP
2 stops20h 00mMultiple Airlines
mar. 9/93:40 amAEP - STL
2 stops22h 19mMultiple Airlines
Deal found 6/30$1,643
This Air Canada deal was found by Cheapflights users on 6/30. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/221:30 pmSTL - AEP
2 stops25h 50mAir Canada
mar. 10/141:40 pmAEP - STL
2 stops27h 38mAir Canada
Deal found 6/30$5,173
This Delta deal was found by Cheapflights users on 6/30. 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.
lun. 8/185:11 pmSTL - AEP
2 stops19h 49mDelta
lun. 10/133:40 pmAEP - STL
2 stops21h 00mDelta
Deal found 6/30$24,205

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 julio 1, 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

mar. 11/18

8:25 am-6:05 am

2 stops18h 40m

Buenos Aires Ministro Pistarini

mar. 11/25

1:45 am-3:29 pm

2 stops16h 44m

$1,004

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

lun. 9/1

5:11 pm-5:00 pm

2 stops21h 49m

Buenos Aires Jorge Newbery

mié. 9/10

3:40 pm-9:59 am

2 stops20h 19m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 9/1

5:11 pm-9:45 am

1 stop14h 34m

Buenos Aires Ministro Pistarini

mié. 9/10

6:00 am-10:02 pm

2 stops18h 02m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mié. 10/22

10:22 am-7:35 am

2 stops19h 13m

Buenos Aires Ministro Pistarini

mié. 10/29

11:35 pm-3:45 pm

2 stops18h 10m

$1,030

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 9/1

1:30 pm-2:30 pm

3 stops47h 00m

Buenos Aires Ministro Pistarini

mié. 9/10

4:35 pm-7:57 pm

2 stops29h 22m

$1,052

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 9/1

5:11 pm-6:10 pm

2 stops22h 59m

Buenos Aires Ministro Pistarini

mar. 9/9

3:55 am-8:10 am

2 stops30h 15m

$1,121

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

jue. 8/14

8:00 am-8:00 am

2 stops22h 00m

Buenos Aires Ministro Pistarini

dom. 8/24

9:00 pm-3:44 pm

2 stops20h 44m

$1,145

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

lun. 9/1

4:00 pm-2:00 pm

2 stops20h 00m

Buenos Aires Jorge Newbery

mar. 9/9

3:40 am-11:59 pm

2 stops22h 19m

$1,643

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

vie. 8/22

1:30 pm-5:20 pm

2 stops25h 50m

Buenos Aires Jorge Newbery

mar. 10/14

1:40 pm-3:18 pm

2 stops27h 38m

$5,173

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

lun. 8/18

5:11 pm-3:00 pm

2 stops19h 49m

Buenos Aires Jorge Newbery

lun. 10/13

3:40 pm-10:40 am

2 stops21h 00m

$24,205

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 15 results
1
2

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 julio 1, 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.

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 julio 1, 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
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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
7,973 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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
1,801 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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
8,858 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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!
Air Canada
7.1
Good
9,665 reviews
Delta
8.0
Very good
7,973 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Boarding

8.2

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

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, LATAM Airlines will fly you from St. Louis to Buenos Aires and back. In addition to LATAM Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and American Airlines - these airlines can fly you to your destination from $1,025 and $1,030, respectively. These flights start at 23% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Buenos Aires one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $758. However, be on the lookout for offers from LATAM Airlines and Air Canada, as they are both options that can get you from St. Louis to Buenos Aires for a low price.

  • 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

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.
Kansas City to Ministro Pistarini flights
St. Louis to Ministro Pistarini flights
St. Louis to Jorge Newbery flights
Kansas City to Jorge Newbery 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 julio 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$1,023Average$1,291FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$1,025Average$1,238FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$1,053Average$1,223FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.