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Cheap flights from St. Louis to Buenos Aires from $830

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Buenos Aires departing on 11/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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LATAM Airlines Logo
9:33 am - 7:40 pmSTL-AEP
31h 07m2 stops
LATAM Airlines Logo
10:35 am - 6:35 pmAEP-STL
35h 00m2 stops
$830LATAM Airlines
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Tue, Nov 18 - Wed, Nov 26
Delta Logo
9:33 am - 6:05 amSTL-EZE
17h 32m2 stops
Delta Logo
8:55 pm - 9:59 amEZE-STL
16h 04m1 stop
$830Delta
Find Deal
Tue, Nov 18 - Wed, Nov 26
United Airlines Logo
6:15 am - 7:20 amSTL-EZE
22h 05m1 stop
United Airlines Logo
11:55 pm - 6:47 pmEZE-STL
21h 52m1 stop
$930United Airlines
Find Deal
Fri, Nov 14 - Sun, Nov 16
United Airlines Logo
6:30 am - 7:20 amSTL-EZE
21h 50m2 stops
United Airlines Logo
10:05 pm - 6:47 pmEZE-STL
23h 42m1 stop
$934United Airlines
Find Deal
Fri, Nov 14 - Sun, Nov 16
American Airlines Logo
5:15 am - 8:10 amSTL-EZE
23h 55m1 stop
American Airlines Logo
11:59 pm - 10:05 pmEZE-STL
25h 06m1 stop
$940American Airlines
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Sat, Jan 17 - Sun, Jan 25
American Airlines Logo
11:06 am - 8:10 amSTL-EZE
18h 04m2 stops
American Airlines Logo
11:59 pm - 10:05 pmEZE-STL
25h 06m1 stop
$945American Airlines
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Sat, Jan 17 - Sun, Jan 25
GOL Logo
11:30 am - 12:50 pmSTL-EZE
23h 20m2 stops
GOL Logo
3:30 am - 10:04 pmEZE-STL
20h 34m2 stops
$1,243GOL
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Sun, Mar 8 - Mon, Mar 16
Multiple Airlines Logo
7:43 pm - 12:50 pmSTL-EZE
38h 07m3 stops
Multiple Airlines Logo
4:45 am - 1:50 pmEZE-STL
36h 05m2 stops
$1,392Multiple Airlines
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Mon, Dec 8 - Thu, Dec 11
Multiple Airlines Logo
5:17 pm - 2:00 pmSTL-AEP
17h 43m2 stops
Multiple Airlines Logo
8:25 pm - 4:33 pmAEP-STL
23h 08m2 stops
$1,501Multiple Airlines
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Fri, Nov 14 - Sun, Nov 16
GOL Logo
10:00 am - 12:45 pmSTL-EZE
23h 45m2 stops
GOL Logo
3:30 am - 10:05 pmEZE-STL
21h 35m2 stops
$1,546GOL
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Sat, Jan 17 - Sat, Jan 24

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Nov 18
STL9:33 amLambert-St Louis
17h 32m
2 stops
EZE6:05 amBuenos Aires Ministro Pistarini
Nov 26
EZE8:55 pmBuenos Aires Ministro Pistarini
16h 04m
1 stop
STL9:59 amLambert-St Louis
$830
Find similar
Delta
Oct 30
STL10:45 amLambert-St Louis
21h 30m
2 stops
EZE10:15 amBuenos Aires Ministro Pistarini
Nov 4
EZE10:25 pmBuenos Aires Ministro Pistarini
22h 04m
2 stops
STL5:29 pmLambert-St Louis
$834
Find similar
Delta
Mar 8
STL7:30 amLambert-St Louis
20h 35m
2 stops
EZE6:05 amBuenos Aires Ministro Pistarini
Mar 17
EZE8:55 pmBuenos Aires Ministro Pistarini
20h 06m
1 stop
STL3:01 pmLambert-St Louis
$880
Find similar

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Nov 14
STL6:15 amLambert-St Louis
22h 05m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Nov 16
EZE11:55 pmBuenos Aires Ministro Pistarini
21h 52m
1 stop
STL6:47 pmLambert-St Louis
$930
Find similar
United Airlines
Nov 14
STL6:30 amLambert-St Louis
21h 50m
2 stops
EZE7:20 amBuenos Aires Ministro Pistarini
Nov 16
EZE10:05 pmBuenos Aires Ministro Pistarini
23h 42m
1 stop
STL6:47 pmLambert-St Louis
$934
Find similar
United Airlines
Oct 28
STL8:20 amLambert-St Louis
22h 00m
1 stop
EZE8:20 amBuenos Aires Ministro Pistarini
Nov 5
EZE11:55 pmBuenos Aires Ministro Pistarini
13h 44m
1 stop
STL10:39 amLambert-St Louis
$1,023
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momondo 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, momondo users made 832,500 searches. Data last updated October 23, 2025.
Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 11/18

9:33 am-7:40 pm

2 stops31h 07m

Buenos Aires Jorge Newbery

Wed 11/26

10:35 am-6:35 pm

2 stops35h 00m

$830

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/18

9:33 am-6:05 am

2 stops17h 32m

Buenos Aires Ministro Pistarini

Wed 11/26

8:55 pm-9:59 am

1 stop16h 04m

$830

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 11/14

6:15 am-7:20 am

1 stop22h 05m

Buenos Aires Ministro Pistarini

Sun 11/16

11:55 pm-6:47 pm

1 stop21h 52m

$930

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 11/14

6:30 am-7:20 am

2 stops21h 50m

Buenos Aires Ministro Pistarini

Sun 11/16

10:05 pm-6:47 pm

1 stop23h 42m

$934

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 1/17

5:15 am-8:10 am

1 stop23h 55m

Buenos Aires Ministro Pistarini

Sun 1/25

11:59 pm-10:05 pm

1 stop25h 06m

$940

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 1/17

11:06 am-8:10 am

2 stops18h 04m

Buenos Aires Ministro Pistarini

Sun 1/25

11:59 pm-10:05 pm

1 stop25h 06m

$945

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

11:30 am-12:50 pm

2 stops23h 20m

Buenos Aires Ministro Pistarini

Mon 3/16

3:30 am-10:04 pm

2 stops20h 34m

$1,243

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 12/8

7:43 pm-12:50 pm

3 stops38h 07m

Buenos Aires Ministro Pistarini

Thu 12/11

4:45 am-1:50 pm

2 stops36h 05m

$1,392

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 11/14

5:17 pm-2:00 pm

2 stops17h 43m

Buenos Aires Jorge Newbery

Sun 11/16

8:25 pm-4:33 pm

2 stops23h 08m

$1,501

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 1/17

10:00 am-12:45 pm

2 stops23h 45m

Buenos Aires Ministro Pistarini

Sat 1/24

3:30 am-10:05 pm

2 stops21h 35m

$1,546

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Buenos Aires

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Buenos Aires?

What is the cheapest month to fly to Buenos Aires?

The cheapest month to fly to Buenos Aires from St. Louis is in September. Flight prices, which tend to average around $1,056, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Buenos Aires from St. Louis during October instead. Flights to Buenos Aires in October, while not as cheap as those in September, still average around $1,160.

What is the cheapest day to depart on your flight to Buenos Aires?

On average, the least expensive day to fly to Buenos Aires from St. Louis is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $1,163. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to Buenos Aires on Friday is $1,386.

What is the cheapest time of day to depart on your flight to Buenos Aires?

Our most recent data shows that the best time of day to fly to Buenos Aires is in the evening. Flights from St. Louis to Buenos Aires during this time can be as low as $1,153. Try not to purchase tickets in the morning because they tend to be around $1,368. Of course, these prices can vary depending on the time of year and what airport you fly to.

When to book flights from St. Louis to Buenos Aires

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Buenos Aires according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Buenos Aires (STL to BUE) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Buenos Aires

Direct flights

None
There are no direct flights from St. Louis to Buenos Aires. There are no popular flight routes from St. Louis to Buenos Aires.
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  • How far is Lambert-St Louis to Buenos Aires by plane?

    The straight-line distance from Lambert-St Louis to Buenos Aires is 5450.9 mi. Typically, this will take 13h 35m by plane in normal conditions.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Buenos Aires?

    Prices for flights from Lambert-St Louis Airport to Buenos Aires are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Buenos Aires?

  • How old do you have to be to fly from Lambert-St Louis Airport to Buenos Aires?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Buenos Aires.

  • What documentation or ID do you need to fly to Buenos Aires?

    The travel and health documents required for your trip to Buenos Aires can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Buenos Aires. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Buenos Aires?

Best airlines flying from St. Louis to Buenos Aires

Compare and see reviews for airlines that fly from St. Louis to Buenos Aires with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $1,023Free CancellationRating
7.4
8,995 reviews
Search United Airlines flights
American AirlinesPriceFrom $1,023Free CancellationRating
7.2
11,032 reviews
Search American Airlines flights
DeltaPriceFrom $1,023Free CancellationRating
7.9
7,982 reviews
Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Buenos Aires?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Buenos Aires from St. Louis.

Can I find flights from St. Louis to Buenos Aires with flexible booking policies on momondo?

Yes. All flights to Buenos Aires from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from St. Louis to Buenos Aires?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Buenos Aires from St. Louis.

I’m not ready to book a flight from St. Louis to Buenos Aires right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Buenos Aires from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Find better results for your trip to Argentina

Fly into one of these airports located in Buenos Aires

Airports listed have a maximum distance of 17.0 mi from Buenos Aires
Buenos Aires Jorge Newbery Airport
Buenos Aires Ministro Pistarini Airport