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Cheap flights from St. Louis to Buenos Aires from $504

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 12/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from St. Louis to Buenos Aires

Cheap round-trip flights

Enter your travel dates to find the best prices.
LATAM Airlines Logo
3:40 pm - 7:35 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
12h 55m1 stop Atlanta Hartsfield-Jackson
LATAM Airlines Logo
11:35 pm - 10:48 amEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
14h 13m1 stop Atlanta Hartsfield-Jackson
$1,133LATAM Airlines
Thu, Jan 14 - Thu, Jan 28
LATAM Airlines Logo
9:00 am - 7:35 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
19h 35m1 stop Atlanta Hartsfield-Jackson
LATAM Airlines Logo
7:20 am - 11:39 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
19h 19m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson
$1,138LATAM Airlines
Thu, Jan 14 - Thu, Jan 28
LATAM Airlines Logo
3:40 pm - 3:00 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
32h 20m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl
LATAM Airlines Logo
7:20 am - 11:39 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
19h 19m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson
$1,144LATAM Airlines
Thu, Jan 14 - Thu, Jan 28
Delta Logo
10:00 am - 6:20 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
17h 20m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl
Delta Logo
5:00 pm - 11:15 amEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
21h 15m2 stops Sao Paulo Guarulhos Intl Atlanta Hartsfield-Jackson
$1,148Delta
Wed, Dec 2 - Thu, Dec 17
Delta Logo
10:00 am - 7:40 amSTL  Lambert-St Louis-AEP Buenos Aires Jorge Newbery
18h 40m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl
Delta Logo
5:35 pm - 8:53 amAEP  Buenos Aires Jorge Newbery-STL Lambert-St Louis
18h 18m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson
$1,148Delta
Wed, Dec 2 - Thu, Dec 17
American Airlines Logo
5:00 pm - 9:10 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
13h 10m1 stop Miami
American Airlines Logo
9:40 pm - 11:33 amEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
16h 53m1 stop Miami
$1,148American Airlines
Wed, Dec 2 - Thu, Dec 17
American Airlines Logo
5:15 am - 7:25 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
23h 10m1 stop Miami
American Airlines Logo
10:30 pm - 2:04 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
18h 34m1 stop Dallas/Fort Worth
$1,148American Airlines
Thu, Jan 14 - Thu, Jan 28
American Airlines Logo
1:06 pm - 10:15 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
18h 09m2 stops Chicago O'Hare Intl Miami
American Airlines Logo
10:10 am - 11:58 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
16h 48m2 stops Miami Chicago O'Hare Intl
$1,152American Airlines
Thu, Jan 14 - Thu, Jan 28
United Airlines Logo
6:50 pm - 7:20 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
33h 30m2 stops Chicago O'Hare Intl Houston George Bush Intcntl
United Airlines Logo
10:05 pm - 10:19 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
27h 14m1 stop Houston George Bush Intcntl
$1,220United Airlines
Tue, Dec 22 - Tue, Dec 29
United Airlines Logo
11:15 am - 8:00 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
18h 45m1 stop Houston George Bush Intcntl
United Airlines Logo
9:00 pm - 10:10 amEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
15h 10m1 stop Houston George Bush Intcntl
$1,228United Airlines
Tue, Aug 25 - Wed, Sep 23

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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 14
STL3:40 pmLambert-St Louis
12h 55m
1 stop
EZE7:35 amBuenos Aires Ministro Pistarini
Jan 28
EZE11:35 pmBuenos Aires Ministro Pistarini
14h 13m
1 stop
STL10:48 amLambert-St Louis
$1,133
LATAM Airlines
Jan 14
STL9:00 amLambert-St Louis
19h 35m
1 stop
EZE7:35 amBuenos Aires Ministro Pistarini
Jan 28
EZE7:20 amBuenos Aires Ministro Pistarini
19h 19m
2 stops
STL11:39 pmLambert-St Louis
$1,138
LATAM Airlines
Jan 14
STL3:40 pmLambert-St Louis
32h 20m
2 stops
EZE3:00 amBuenos Aires Ministro Pistarini
Jan 28
EZE7:20 amBuenos Aires Ministro Pistarini
19h 19m
2 stops
STL11:39 pmLambert-St Louis
$1,144

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Dec 22
STL6:15 amLambert-St Louis
22h 05m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Dec 29
EZE10:05 pmBuenos Aires Ministro Pistarini
27h 14m
1 stop
STL10:19 pmLambert-St Louis
$1,247
United Airlines
Aug 23
STL6:54 pmLambert-St Louis
35h 06m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
Sep 24
EZE9:00 pmBuenos Aires Ministro Pistarini
24h 41m
2 stops
STL7:41 pmLambert-St Louis
$1,250
United Airlines
Dec 21
STL6:50 pmLambert-St Louis
33h 30m
2 stops
EZE7:20 amBuenos Aires Ministro Pistarini
Dec 28
EZE11:55 pmBuenos Aires Ministro Pistarini
24h 23m
2 stops
STL9:18 pmLambert-St Louis
$1,261

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 August 12, 2026.
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

Cheapest round-trip
Quickest round-trip

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Thu 1/14

3:40 pm-7:35 am

1 stop12h 55m

Buenos Aires Ministro Pistarini

Thu 1/28

11:35 pm-10:48 am

1 stop14h 13m

$1,133

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Thu 1/14

9:00 am-7:35 am

1 stop19h 35m

Buenos Aires Ministro Pistarini

Thu 1/28

7:20 am-11:39 pm

2 stops19h 19m

$1,138

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Thu 1/14

3:40 pm-3:00 am

2 stops32h 20m

Buenos Aires Ministro Pistarini

Thu 1/28

7:20 am-11:39 pm

2 stops19h 19m

$1,144

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Wed 12/2

10:00 am-6:20 am

2 stops17h 20m

Buenos Aires Ministro Pistarini

Thu 12/17

5:00 pm-11:15 am

2 stops21h 15m

$1,148

St. LouisBuenos Aires

STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery

STLAEP

Lambert-St Louis

Wed 12/2

10:00 am-7:40 am

2 stops18h 40m

Buenos Aires Jorge Newbery

Thu 12/17

5:35 pm-8:53 am

2 stops18h 18m

$1,148

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Wed 12/2

5:00 pm-9:10 am

1 stop13h 10m

Buenos Aires Ministro Pistarini

Thu 12/17

9:40 pm-11:33 am

1 stop16h 53m

$1,148

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Thu 1/14

5:15 am-7:25 am

1 stop23h 10m

Buenos Aires Ministro Pistarini

Thu 1/28

10:30 pm-2:04 pm

1 stop18h 34m

$1,148

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Thu 1/14

1:06 pm-10:15 am

2 stops18h 09m

Buenos Aires Ministro Pistarini

Thu 1/28

10:10 am-11:58 pm

2 stops16h 48m

$1,152

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 12/22

6:50 pm-7:20 am

2 stops33h 30m

Buenos Aires Ministro Pistarini

Tue 12/29

10:05 pm-10:19 pm

1 stop27h 14m

$1,220

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 8/25

11:15 am-8:00 am

1 stop18h 45m

Buenos Aires Ministro Pistarini

Wed 9/23

9:00 pm-10:10 am

1 stop15h 10m

$1,228

Flights are sorted by cheapest round-trip flights 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 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 $0, 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 April instead. Flights to Buenos Aires in April, while not as cheap as those in September, still average around $0.

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

Fastest flight time

12h 51m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 51m
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 51m 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
LATAM AirlinesPriceFrom $884Free CancellationRating
7.4
1,979 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.8
8,505 reviews
Search Delta flights
American AirlinesPriceFrom $1,147Free CancellationRating
7.1
11,915 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.

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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