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$984+ 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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$984
(flugladen.de)

Popular in

November

Cheapest in

June

Average price

$1,144
From Lambert-St Louis to Buenos Aires (BUE)
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($51 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 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 September 11, 2025.

This flugladen.de deal was found by Cheapflights users on 9/11. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2610:22 amSTL - EZE
2 stops17h 28mMultiple Airlines
Sat 11/12:40 amEZE - STL
2 stops18h 20mMultiple Airlines
Deal found 9/11$984
This LATAM Airlines deal was found by Cheapflights users on 9/10. 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 11/189:21 amSTL - AEP
2 stops19h 34mLATAM Airlines
Wed 11/2610:35 amAEP - STL
2 stops26h 29mLATAM Airlines
Deal found 9/10$1,025
This Delta deal was found by Cheapflights users on 9/11. 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.
Tue 11/189:21 amSTL - EZE
2 stops17h 59mDelta
Wed 11/268:55 pmEZE - STL
1 stop16h 09mDelta
Deal found 9/11$1,025
This Mytrip deal was found by Cheapflights users on 9/11. 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.
Sun 10/2610:57 amSTL - AEP
3 stops28h 33mMultiple Airlines
Sun 11/27:40 pmAEP - STL
3 stops46h 49mMultiple Airlines
Deal found 9/11$1,092
This Travelocity deal was found by Cheapflights users on 9/9. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/121:55 pmSTL - AEP
2 stops21h 45mLATAM Airlines
Tue 12/235:15 pmAEP - STL
2 stops33h 24mLATAM Airlines
Deal found 9/9$1,095
This Gotogate deal was found by Cheapflights users on 9/11. 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.
Sun 10/264:05 pmSTL - EZE
2 stops21h 05mAir Canada
Sun 11/24:45 pmEZE - STL
2 stops25h 44mAir Canada
Deal found 9/11$1,108
This LATAM Airlines deal was found by Cheapflights users on 9/9. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/85:12 pmSTL - AEP
2 stops19h 48mLATAM Airlines
Fri 12/1210:35 amAEP - STL
2 stops26h 49mLATAM Airlines
Deal found 9/9$1,141
This LATAM Airlines deal was found by Cheapflights users on 9/9. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/89:30 amSTL - EZE
2 stops17h 50mLATAM Airlines
Fri 12/127:45 amEZE - STL
2 stops18h 56mLATAM Airlines
Deal found 9/9$1,141
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/266:43 pmSTL - EZE
2 stops33h 37mUnited Airlines
Sun 11/211:55 pmEZE - STL
1 stop21h 51mUnited Airlines
Deal found 9/10$1,145
This United Airlines deal was found by Cheapflights users on 9/11. 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 9/296:15 amSTL - EZE
1 stop23h 45mUnited Airlines
Wed 10/159:00 pmEZE - STL
1 stop21h 28mUnited Airlines
Deal found 9/11$1,195
This Expedia deal was found by Cheapflights users on 9/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/265:15 pmSTL - AEP
2 stops18h 45mLATAM Airlines
Sun 11/28:25 pmAEP - STL
2 stops41h 01mLATAM Airlines
Deal found 9/10$1,254
This Mytrip deal was found by Cheapflights users on 9/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/184:05 pmSTL - AEP
2 stops28h 35mMultiple Airlines
Wed 11/264:40 pmAEP - STL
3 stops25h 49mMultiple Airlines
Deal found 9/9$1,404

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 September 11, 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 10/26

10:57 am-3:10 pm

3 stops26h 13m

Buenos Aires Ministro Pistarini

Sun 11/2

8:40 am-3:29 pm

3 stops33h 49m

$986

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/18

9:21 am-5:55 am

2 stops17h 34m

Buenos Aires Ministro Pistarini

Wed 11/26

7:43 pm-10:04 am

2 stops17h 21m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/18

7:05 am-5:55 am

2 stops19h 50m

Buenos Aires Ministro Pistarini

Wed 11/26

8:55 pm-10:04 am

1 stop16h 09m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 1/22

7:30 am-9:00 am

1 stop22h 30m

Buenos Aires Ministro Pistarini

Mon 2/9

8:55 pm-9:04 am

1 stop15h 09m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 1/22

4:00 pm-2:55 pm

2 stops19h 55m

Buenos Aires Ministro Pistarini

Mon 2/9

8:00 am-11:40 pm

2 stops18h 40m

$1,025

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 11/18

1:55 pm-4:00 pm

2 stops23h 05m

Buenos Aires Jorge Newbery

Wed 11/26

8:25 pm-9:58 pm

2 stops28h 33m

$1,055

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

10:00 am-9:00 am

1 stop21h 00m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-10:50 am

1 stop15h 55m

$1,065

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

11:51 am-7:55 am

2 stops18h 04m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-10:50 am

2 stops19h 35m

$1,065

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

4:00 pm-9:35 am

2 stops15h 35m

Buenos Aires Ministro Pistarini

Tue 3/17

8:00 am-11:40 pm

2 stops17h 40m

$1,070

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 12/12

1:55 pm-2:40 pm

2 stops21h 45m

Buenos Aires Jorge Newbery

Tue 12/23

5:15 pm-11:39 pm

2 stops33h 24m

$1,095

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 14 results
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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 September 11, 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 September 11, 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
7,960 reviews

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

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
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

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
1,847 reviews
Delta
8.0
Very good
7,960 reviews

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

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
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

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
7,960 reviews

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Crew

8.5

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.

  • How long is the flight from St. Louis to Buenos Aires?

    Airlines like LATAM Airlines and Delta fly from St. Louis to Buenos Aires in about 17h 34m. The time it takes to get you to your destination can typically vary by up to 2h 16m. 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 are the cheapest airlines flying from St. Louis to Buenos Aires round-trip?

    Currently priced at $1,023, American Airlines will fly you from St. Louis to Buenos Aires and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $1,023 and $1,053, respectively. These flights start at 18% 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.
St. Louis to Ministro Pistarini flights
Kansas City 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$1,023Average$1,287FlexibilityNo cancel feeOn-time71%
DeltaCheapest$1,023Average$1,260FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$1,053Average$1,203FlexibilityNo cancel feeOn-time69%

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