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$758+ 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 3/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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The best prices from Lambert-St Louis to Buenos Aires are usually found in August or September, booked 47 days in advance, depart on a Tuesday or Wednesday and return on a Monday

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 January 21, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,126
(United Airlines)

One-way from

$758
(American Airlines)

Popular in

November

Cheapest in

August

Average price

$1,363
Provider with most accurate pricing for Lambert-St Louis-Buenos Aires (BUE) flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Buenos Aires (BUE) flights.
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From Lambert-St Louis to Buenos Aires (BUE)
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One-way flight from Lambert-St Louis to Buenos Aires (BUE)
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High demand for flights, 7% potential price rise
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Best time to find cheap flights, 1% potential price drop
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Average for round-trip flights in January 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 January 21, 2025.

This LATAM Airlines deal was found by Cheapflights users on 1/20. 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 10/87:05 pmSTL - AEP
2 stops21h 25mLATAM Airlines
Mon 10/206:10 pmAEP - STL
2 stops25h 53mLATAM Airlines
Deal found 1/20$1,025
This Delta deal was found by Cheapflights users on 1/20. 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.
Wed 10/87:05 pmSTL - EZE
1 stop12h 40mDelta
Mon 10/208:10 pmEZE - STL
1 stop23h 53mDelta
Deal found 1/20$1,025
This United Airlines deal was found by Cheapflights users on 1/20. 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 11/34:17 pmSTL - EZE
1 stop14h 03mUnited Airlines
Wed 11/1210:05 pmEZE - STL
2 stops19h 13mUnited Airlines
Deal found 1/20$1,030
This KAYAK deal was found by Cheapflights users on 1/20. 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.
Sat 10/117:05 pmSTL - EZE
2 stops29h 25mLATAM Airlines
Sat 10/187:40 amEZE - STL
2 stops17h 59mLATAM Airlines
Deal found 1/20$1,179
This American Airlines deal was found by Cheapflights users on 1/20. 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.
Sat 10/1112:03 pmSTL - EZE
2 stops17h 32mAmerican Airlines
Sat 10/188:30 pmEZE - STL
1 stop28h 39mAmerican Airlines
Deal found 1/20$1,248
This United Airlines deal was found by Cheapflights users on 1/20. 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 11/34:17 pmSTL - EZE
1 stop14h 03mMultiple Airlines
Tue 11/111:45 amEZE - STL
2 stops17h 50mMultiple Airlines
Deal found 1/20$1,256
This Air Canada deal was found by Cheapflights users on 1/20. 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.
Tue 10/141:30 pmSTL - EZE
3 stops47h 00mAir Canada
Mon 10/204:35 pmEZE - STL
2 stops24h 41mAir Canada
Deal found 1/20$1,333
This Gotogate deal was found by Cheapflights users on 1/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/34:15 pmSTL - AEP
2 stops21h 55mMultiple Airlines
Tue 11/113:00 amAEP - STL
2 stops39h 26mMultiple Airlines
Deal found 1/20$1,514
This Copa Airlines deal was found by Cheapflights users on 1/20. 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 Copa Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/298:15 amSTL - EZE
2 stops20h 34mCopa Airlines
Fri 2/72:43 amEZE - STL
2 stops19h 26mCopa Airlines
Deal found 1/20$1,535
This Air Canada deal was found by Cheapflights users on 1/20. 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.
Fri 10/101:30 pmSTL - AEP
2 stops25h 50mAir Canada
Sat 10/181:40 pmAEP - STL
2 stops27h 36mAir Canada
Deal found 1/20$1,637
This AranGrant deal was found by Cheapflights users on 1/21. 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 AranGrant is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/155:13 amSTL - EZE
2 stops28h 07mGOL
Tue 2/255:00 pmEZE - STL
2 stops25h 58mGOL
Deal found 1/21$2,731
This FlightHub deal was found by Cheapflights users on 1/20. 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.
Sun 10/1210:30 amSTL - EZE
2 stops17h 05mAvianca
Fri 10/171:40 amEZE - STL
2 stops17h 34mAvianca
Deal found 1/20$4,358

Find flights from St. Louis to Buenos Aires within your budget

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 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 4/20

3:40 pm-8:00 am

2 stops38h 20m

Buenos Aires Ministro Pistarini

Fri 4/25

9:00 pm-9:56 am

1 stop14h 56m

$1,143

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 4/20

7:10 pm-9:45 am

1 stop12h 35m

Buenos Aires Ministro Pistarini

Fri 4/25

8:10 pm-4:27 pm

1 stop22h 17m

$1,161

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 4/20

7:10 pm-6:30 pm

2 stops45h 20m

Buenos Aires Jorge Newbery

Fri 4/25

10:35 am-11:45 am

2 stops27h 10m

$1,204

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 2/6

2:00 pm-10:03 pm

2 stops29h 03m

Buenos Aires Ministro Pistarini

Thu 2/20

7:35 am-11:37 pm

2 stops19h 02m

$1,298

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 3/6

5:01 am-6:59 am

1 stop22h 58m

Buenos Aires Ministro Pistarini

Thu 3/13

8:30 pm-4:12 pm

1 stop21h 42m

$1,300

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 2/6

8:15 am-12:15 am

2 stops37h 00m

Buenos Aires Ministro Pistarini

Wed 2/19

12:18 am-7:15 pm

2 stops21h 57m

$1,521

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 4/20

3:50 pm-6:20 pm

2 stops24h 30m

Buenos Aires Jorge Newbery

Thu 4/24

3:40 am-10:15 pm

2 stops20h 35m

$1,622

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 2/12

8:15 am-7:49 am

2 stops20h 34m

Buenos Aires Ministro Pistarini

Fri 2/21

2:43 am-7:15 pm

2 stops19h 32m

$2,579

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 2/15

5:13 am-12:20 pm

2 stops28h 07m

Buenos Aires Ministro Pistarini

Tue 2/25

5:00 pm-3:58 pm

2 stops25h 58m

$2,731

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 2/15

3:50 pm-3:25 pm

2 stops20h 35m

Buenos Aires Ministro Pistarini

Tue 2/25

5:00 pm-2:36 pm

3 stops24h 36m

$6,148

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 12 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 January.
ProviderPrice AccuracyTrust Score*
AranGrantPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
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 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.

Travel insights for flights from St. Louis to Buenos Aires

Get recent, data-driven insights about flights from St. Louis to Buenos Aires including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from St. Louis to Buenos Aires?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Buenos Aires. Price data was last updated on January 17, 2025.

The price you pay for your flight from St. Louis to Buenos Aires may vary depending on when you book. For the best chance of a lower fare, look to book 47 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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?

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 January 21, 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.

Rainfall in Buenos Aires by month

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

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

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 21, 2025.
Get a feel of what it's like to fly with Delta, Copa Airlines and LATAM 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
8,521 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,521 reviews
Delta
8.0
Very good
8,521 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Copa Airlines
7.7
Good
1,662 reviews
Delta
8.0
Very good
8,521 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

LATAM Airlines
7.5
Good
1,858 reviews
Delta
8.0
Very good
8,521 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines
7.4
Good
8,984 reviews
Delta
8.0
Very good
8,521 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

GOL
7.3
Good
1,091 reviews
Delta
8.0
Very good
8,521 reviews

Entertainment

7.9

Boarding

8.2

Crew

8.6

Food

7.3

Overall

8.0

Comfort

8.0

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $1,126, United Airlines will fly you from St. Louis to Buenos Aires and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and LATAM Airlines - these airlines can fly you to your destination from $1,161 and $1,204, respectively. These flights start at 9% 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

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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.
Kansas City to Ministro Pistarini flights
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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 January 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$814Average$1,203FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$999Average$1,262FlexibilityNo cancel feeOn-time71%
DeltaCheapest$1,004Average$1,243FlexibilityNo cancel feeOn-timeN/A
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