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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

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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 - 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
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
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
8:29 am - 8:30 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
21h 01m1 stop Dallas/Fort Worth
American Airlines Logo
10:10 am - 11:59 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
16h 49m1 stop Miami
$1,148American Airlines
Thu, Jan 14 - Thu, Jan 28
Delta Logo
7:20 am - 6:20 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
20h 00m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl
Delta Logo
11:35 pm - 6:01 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
21h 26m1 stop Atlanta Hartsfield-Jackson
$1,148Delta
Thu, Jan 14 - Thu, Jan 28
United Airlines Logo
6:15 am - 8:00 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
23h 45m1 stop Houston George Bush Intcntl
United Airlines Logo
9:00 pm - 2:10 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
19h 10m1 stop Houston George Bush Intcntl
$1,188United Airlines
Mon, Sep 28 - Mon, Oct 5
United Airlines Logo
6:15 am - 9:20 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
24h 05m1 stop Houston George Bush Intcntl
United Airlines Logo
10:05 pm - 6:13 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
23h 08m2 stops Houston George Bush Intcntl Chicago O'Hare Intl
$1,192United Airlines
Tue, Dec 22 - Tue, Dec 29

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United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Sep 28
STL6:15 amLambert-St Louis
23h 45m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Oct 5
EZE9:00 pmBuenos Aires Ministro Pistarini
19h 10m
1 stop
STL2:10 pmLambert-St Louis
$1,188
United Airlines
Sep 28
STL3:12 pmLambert-St Louis
14h 48m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Oct 5
EZE9:00 pmBuenos Aires Ministro Pistarini
24h 41m
2 stops
STL7:41 pmLambert-St Louis
$1,192
United Airlines
Dec 22
STL6:50 pmLambert-St Louis
33h 30m
2 stops
EZE7:20 amBuenos Aires Ministro Pistarini
Dec 29
EZE10:05 pmBuenos Aires Ministro Pistarini
23h 08m
2 stops
STL6:13 pmLambert-St Louis
$1,210

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Dec 2
STL10:00 amLambert-St Louis
17h 20m
2 stops
EZE6:20 amBuenos Aires Ministro Pistarini
Dec 17
EZE5:00 pmBuenos Aires Ministro Pistarini
21h 15m
2 stops
STL11:15 amLambert-St Louis
$1,148
Delta
Dec 2
STL10:00 amLambert-St Louis
18h 40m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Dec 17
AEP5:35 pmBuenos Aires Jorge Newbery
18h 18m
2 stops
STL8:53 amLambert-St Louis
$1,198
Delta
Aug 25
STL9:15 amLambert-St Louis
22h 30m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Sep 21
EZE8:10 pmBuenos Aires Ministro Pistarini
14h 50m
1 stop
STL9:00 amLambert-St Louis
$1,228

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 15, 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 - 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

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 - 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

8:29 am-8:30 am

1 stop21h 01m

Buenos Aires Ministro Pistarini

Thu 1/28

10:10 am-11:59 pm

1 stop16h 49m

$1,148

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Thu 1/14

7:20 am-6:20 am

2 stops20h 00m

Buenos Aires Ministro Pistarini

Thu 1/28

11:35 pm-6:01 pm

1 stop21h 26m

$1,148

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Mon 9/28

6:15 am-8:00 am

1 stop23h 45m

Buenos Aires Ministro Pistarini

Mon 10/5

9:00 pm-2:10 pm

1 stop19h 10m

$1,188

St. LouisBuenos Aires

STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini

STLEZE

Lambert-St Louis

Tue 12/22

6:15 am-9:20 am

1 stop24h 05m

Buenos Aires Ministro Pistarini

Tue 12/29

10:05 pm-6:13 pm

2 stops23h 08m

$1,192

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 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 November instead. Flights to Buenos Aires in November, while not as cheap as those in September, still average around $1,065.

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 55m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 55m
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 55m 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
8,501 reviews
Search Delta flights
American AirlinesPriceFrom $1,147Free CancellationRating
7.1
11,928 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