What is the cheapest airline that flies from Lambert-St Louis to Buenos Aires?

Copa Airlines and LATAM Airlines are the most popular carriers operating from Lambert-St Louis to Buenos Aires

What airlines fly to Buenos Aires?

Delta, LATAM Airlines and American Airlines are the top three most popular airlines that fly to Buenos Aires from St. Louis according to our data. Delta is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Buenos Aires. Keep in mind that there are 3 different airlines that fly to Buenos Aires on a routine basis, so you have a few additional options to choose from.

Which layover airport offers the lowest fares from St. Louis to Buenos Aires?

Flights via Punta Cana (PUJ) offer the lowest average round-trip price of $632.

Which airport is the most popular layover for flights between St. Louis and Buenos Aires?

Atlanta (ATL) was the most common stop: 60% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from St. Louis to Buenos Aires?

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 12h 13m.

Which layover airport has the shortest connection time from St. Louis to Buenos Aires?

Dallas (DFW) has the shortest average layover time for this route: 1h 45m.

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?

As of October 2026, there are 3 operators available to choose from 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.

$468 Cheap Flights from St. Louis to Buenos Aires in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Buenos Aires

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:02 pm - 9:50 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

18h 48m2 stops Atlanta Hartsfield-Jackson Miami

6:00 am - 6:14 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

15h 14m1 stop Punta Cana

$1,202Multiple Airlines

Mon, Dec 7 - Mon, Dec 14

6:20 pm - 3:10 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

29h 50m2 stops Orlando Panama City Tocumen Intl

11:00 am - 6:14 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

34h 14m1 stop Punta Cana

$1,224Multiple Airlines

Tue, Dec 8 - Tue, Dec 15

12:05 pm - 9:32 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

18h 27m1 stop Punta Cana

9:10 am - 12:12 amEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

42h 02m2 stops Panama City Tocumen Intl Orlando

$1,241Multiple Airlines

Mon, Nov 30 - Tue, Dec 8

10:12 am - 7:35 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

18h 23m1 stop Atlanta Hartsfield-Jackson

8:05 pm - 12:44 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

19h 39m1 stop New York John F Kennedy Intl

$1,268Delta

Tue, Jan 12 - Thu, Jan 21

9:00 am - 9:40 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

21h 40m1 stop Atlanta Hartsfield-Jackson

11:35 pm - 6:01 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

21h 26m1 stop Atlanta Hartsfield-Jackson

$1,268Delta

Tue, Jan 12 - Thu, Jan 21

6:00 am - 6:20 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

21h 20m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl

9:30 pm - 8:12 amEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

13h 42m1 stop Atlanta Hartsfield-Jackson

$1,268LATAM Airlines

Tue, Jan 12 - Thu, Jan 21

10:12 am - 9:30 pmSTL Lambert-St Louis-AEP Buenos Aires Jorge Newbery

32h 18m2 stops Atlanta Hartsfield-Jackson Santiago Arturo Merino Benitez

5:35 pm - 9:17 amAEP Buenos Aires Jorge Newbery-STL Lambert-St Louis

18h 42m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson

$1,268LATAM Airlines

Mon, Jan 11 - Thu, Jan 21

3:40 pm - 2:40 pmSTL Lambert-St Louis-AEP Buenos Aires Jorge Newbery

20h 00m2 stops Atlanta Hartsfield-Jackson Santiago Arturo Merino Benitez

5:35 pm - 10:48 amAEP Buenos Aires Jorge Newbery-STL Lambert-St Louis

20h 13m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson

$1,268LATAM Airlines

Tue, Jan 12 - Thu, Jan 21

10:25 am - 9:00 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

19h 35m1 stop Dallas/Fort Worth

11:59 pm - 3:44 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

18h 45m1 stop Miami

$1,308American Airlines

Tue, Dec 8 - Tue, Dec 15

4:48 pm - 9:05 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

13h 17m1 stop Miami

10:10 am - 9:50 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

14h 40m1 stop Miami

$1,308American Airlines

Wed, Dec 9 - Wed, Dec 16

Cheap last minute flights

Enter your travel dates to find the best prices.

7:20 pm - 3:00 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

29h 40m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl

4:00 am - 9:59 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

20h 59m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson

$1,867LATAM Airlines

Tue, Oct 27 - Mon, Nov 2

4:05 pm - 1:25 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

31h 20m3 stops Toronto Pearson Intl Cancun Medellín Jose Maria Cordova Intl

8:57 am - 3:26 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

33h 29m2 stops Punta Cana Toronto Pearson Intl

$1,875Multiple Airlines

Tue, Oct 27 - Tue, Nov 3

5:35 pm - 6:30 pmSTL Lambert-St Louis-AEP Buenos Aires Jorge Newbery

22h 55m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl

1:05 pm - 6:12 pmAEP Buenos Aires Jorge Newbery-STL Lambert-St Louis

32h 07m2 stops Sao Paulo Guarulhos Intl Atlanta Hartsfield-Jackson

$1,962LATAM Airlines

Tue, Oct 27 - Tue, Nov 3

4:05 pm - 1:25 amSTL Lambert-St Louis-EZE Buenos Aires Ministro Pistarini

31h 20m3 stops Toronto Pearson Intl Cancun Medellín Jose Maria Cordova Intl

12:45 pm - 3:26 pmEZE Buenos Aires Ministro Pistarini-STL Lambert-St Louis

29h 41m3 stops Rio de Janeiro–Galeão Intl Sao Paulo Guarulhos Intl Toronto Pearson Intl

$2,033Multiple Airlines

Tue, Oct 27 - Tue, Nov 3

5:00 am - 5:30 pmSTL Lambert-St Louis-AEP Buenos Aires Jorge Newbery

34h 30m3 stops Chicago O'Hare Intl Toronto Pearson Intl Rio de Janeiro–Galeão Intl

6:35 am - 3:26 pmAEP Buenos Aires Jorge Newbery-STL Lambert-St Louis

35h 51m3 stops Rosario Fisherton Sao Paulo Guarulhos Intl Toronto Pearson Intl

$3,631Multiple Airlines

Tue, Oct 27 - Tue, Nov 3

5:00 am - 5:30 pmSTL Lambert-St Louis-AEP Buenos Aires Jorge Newbery

34h 30m3 stops Chicago O'Hare Intl Toronto Pearson Intl Rio de Janeiro–Galeão Intl

9:00 am - 3:26 pmAEP Buenos Aires Jorge Newbery-STL Lambert-St Louis

33h 26m2 stops Sao Paulo Guarulhos Intl Toronto Pearson Intl

$3,671Multiple Airlines

Tue, Oct 27 - Tue, Nov 3

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets

LATAM Airlines

Jan 11

STL11:51 amLambert-St Louis

16h 44m

1 stop

EZE7:35 amBuenos Aires Ministro Pistarini

Jan 21

EZE9:30 pmBuenos Aires Ministro Pistarini

13h 42m

1 stop

STL8:12 amLambert-St Louis

$1,274

LATAM Airlines

Jan 13

STL3:40 pmLambert-St Louis

15h 10m

2 stops

EZE9:50 amBuenos Aires Ministro Pistarini

Jan 21

EZE9:30 pmBuenos Aires Ministro Pistarini

13h 42m

1 stop

STL8:12 amLambert-St Louis

$1,293

LATAM Airlines

Jan 11

STL11:51 amLambert-St Louis

18h 59m

2 stops

EZE9:50 amBuenos Aires Ministro Pistarini

Jan 20

EZE9:30 pmBuenos Aires Ministro Pistarini

13h 42m

1 stop

STL8:12 amLambert-St Louis

$1,327

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets

United Airlines

Jan 12

STL1:17 pmLambert-St Louis

17h 03m

2 stops

EZE9:20 amBuenos Aires Ministro Pistarini

Jan 21

EZE10:05 pmBuenos Aires Ministro Pistarini

19h 01m

1 stop

STL2:06 pmLambert-St Louis

$1,268

United Airlines

Dec 17

STL6:15 amLambert-St Louis

22h 05m

1 stop

EZE7:20 amBuenos Aires Ministro Pistarini

Jan 22

EZE10:05 pmBuenos Aires Ministro Pistarini

23h 32m

1 stop

STL6:37 pmLambert-St Louis

$1,583

United Airlines

Dec 17

STL5:05 amLambert-St Louis

23h 15m

2 stops

EZE7:20 amBuenos Aires Ministro Pistarini

Jan 22

EZE10:05 pmBuenos Aires Ministro Pistarini

26h 32m

2 stops

STL9:37 pmLambert-St Louis

$1,587

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Mon 12/7

12:02 pm-9:50 am

2 stops18h 48m

Buenos Aires Ministro Pistarini

Mon 12/14

6:00 am-6:14 pm

1 stop15h 14m

$1,202

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 12/8

6:20 pm-3:10 am

2 stops29h 50m

Buenos Aires Ministro Pistarini

Tue 12/15

11:00 am-6:14 pm

1 stop34h 14m

$1,224

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Mon 11/30

12:05 pm-9:32 am

1 stop18h 27m

Buenos Aires Ministro Pistarini

Tue 12/8

9:10 am-12:12 am

2 stops42h 02m

$1,241

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 1/12

10:12 am-7:35 am

1 stop18h 23m

Buenos Aires Ministro Pistarini

Thu 1/21

8:05 pm-12:44 pm

1 stop19h 39m

$1,268

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 1/12

9:00 am-9:40 am

1 stop21h 40m

Buenos Aires Ministro Pistarini

Thu 1/21

11:35 pm-6:01 pm

1 stop21h 26m

$1,268

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 1/12

6:00 am-6:20 am

2 stops21h 20m

Buenos Aires Ministro Pistarini

Thu 1/21

9:30 pm-8:12 am

1 stop13h 42m

$1,268

St. LouisBuenos Aires

STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery

STLAEP

Lambert-St Louis

Mon 1/11

10:12 am-9:30 pm

2 stops32h 18m

Buenos Aires Jorge Newbery

Thu 1/21

5:35 pm-9:17 am

2 stops18h 42m

$1,268

St. LouisBuenos Aires

STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery

STLAEP

Lambert-St Louis

Tue 1/12

3:40 pm-2:40 pm

2 stops20h 00m

Buenos Aires Jorge Newbery

Thu 1/21

5:35 pm-10:48 am

2 stops20h 13m

$1,268

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 12/8

10:25 am-9:00 am

1 stop19h 35m

Buenos Aires Ministro Pistarini

Tue 12/15

11:59 pm-3:44 pm

1 stop18h 45m

$1,308

Quickest round-trip

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Wed 12/9

4:48 pm-9:05 am

1 stop13h 17m

Buenos Aires Ministro Pistarini

Wed 12/16

10:10 am-9:50 pm

1 stop14h 40m

$1,308

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Layovers

What is the cheapest month to fly to Buenos Aires?

The cheapest month to fly to Buenos Aires from St. Louis is in June. Flight prices, which tend to average around $1,109, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of June, then book flights to Buenos Aires from St. Louis during September instead. Flights to Buenos Aires in September, while not as cheap as those in June, still average around $1,198.

Can stopping save me money on St. Louis to Buenos Aires flights?

You could potentially save up to 8% on your flight if you consider stops on a St. Louis to Buenos Aires flight.

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

Best Price Found	$468
Fastest flight time	12h 35m
Direct flights	None

The best one-way flight to Buenos Aires from St. Louis in the past 72 hours is $468. The best round-trip flight deal from St. Louis to Buenos Aires found on momondo in the last 72 hours is $1,202.

The fastest flight from St. Louis to Buenos Aires takes 12h 35m

There are no direct flights from St. Louis to Buenos Aires. There are no popular flight routes from St. Louis to Buenos Aires.

Search flight deals

Frequently asked questions about flying from St. Louis to Buenos Aires

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 12h 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?
As of October 2026, there are 3 operators available to choose from 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?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Buenos Aires is Delta (44% of total bookings). The next most popular airlines are LATAM Airlines (37%) and American Airlines (19%).

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
Delta	PriceFrom $431	Free Cancellation	Rating 7.8 8,677 reviews	Search Delta flights
LATAM Airlines	PriceFrom $1,037	Free Cancellation	Rating 7.4 1,969 reviews	Search LATAM Airlines flights
American Airlines	PriceFrom $1,147	Free Cancellation	Rating 7.0 12,187 reviews	Search American Airlines 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.

An easier way to manage your Buenos Aires trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Wed 11/25

Wed 12/2

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Argentina

Nearby airports

Airlines

Cabin classes

Other Argentina destinations

Other flights from St. Louis

Complete your trip

Feeling lucky

Fly into one of these airports located in Buenos Aires

Buenos Aires Jorge Newbery Airport

Buenos Aires Ministro Pistarini Airport

Cheap flights from St. Louis to Buenos Aires from $468

This is the cheapest one-way 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 11/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from St. Louis to Buenos Aires

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.

See travel insights to Buenos Aires from

How to get the cheapest flight ticket from St. Louis to Buenos Aires

What is the cheapest month to fly to Buenos Aires?

Can stopping save me money on St. Louis to Buenos Aires flights?

What is the cheapest airline that flies from Lambert-St Louis to Buenos Aires?

What airlines fly to Buenos Aires?

Which airport is the most popular layover for flights between St. Louis and Buenos Aires?

Which layover airport offers the lowest fares from St. Louis to Buenos Aires?

Which layover airport has the shortest travel time from St. Louis to Buenos Aires?

Which layover airport has the shortest connection time from St. Louis to Buenos Aires?

When to book flights from St. Louis to Buenos Aires

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

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying 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

Why use momondo?

An easier way to manage your Buenos Aires trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

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

Fly your favorite airline to Buenos Aires

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Buenos Aires

List of cabin classes available on flights landing in Buenos Aires. Availability may vary depending on flight origin and airline.

Popular cities in Argentina

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from St. Louis

According to popular flight searches on momondo this year

Complete your trip to Buenos Aires

Explore popular destinations other users love

According to popular flight searches on momondo this year