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Cheap flights from St. Louis to Buenos Aires from $343

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 5/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
American Airlines Logo
1:19 pm - 7:05 am
STL
-
EZE
15h 46m
1 stop
American Airlines Logo
10:05 pm - 7:36 pm
EZE
-
STL
23h 31m
1 stop
$909American Airlines
Mon, Jun 8 - Mon, Jun 15
American Airlines Logo
2:58 pm - 7:05 am
STL
-
EZE
14h 07m
1 stop
American Airlines Logo
8:35 pm - 12:49 pm
EZE
-
STL
18h 14m
2 stops
$913American Airlines
Mon, Jun 8 - Mon, Jun 15
LATAM Airlines Logo
10:16 am - 6:21 pm
STL
-
EZE
30h 05m
2 stops
LATAM Airlines Logo
1:10 pm - 12:17 pm
EZE
-
STL
25h 07m
2 stops
$990LATAM Airlines
Sat, Jul 25 - Sun, Aug 2
LATAM Airlines Logo
10:16 am - 8:30 am
STL
-
AEP
20h 14m
2 stops
LATAM Airlines Logo
3:45 pm - 12:34 pm
AEP
-
STL
22h 49m
2 stops
$1,013LATAM Airlines
Sat, Jun 27 - Sun, Jul 5
Delta Logo
8:00 am - 6:10 am
STL
-
EZE
20h 10m
2 stops
Delta Logo
8:10 pm - 8:16 am
EZE
-
STL
14h 06m
1 stop
$1,029Delta
Sat, Jun 27 - Sun, Jul 5
LATAM Airlines Logo
7:12 pm - 9:45 am
STL
-
EZE
12h 33m
1 stop
LATAM Airlines Logo
10:40 pm - 6:07 pm
EZE
-
STL
21h 27m
2 stops
$1,033LATAM Airlines
Fri, Jun 26 - Sat, Jul 4
LATAM Airlines Logo
10:16 am - 9:45 am
STL
-
EZE
21h 29m
1 stop
LATAM Airlines Logo
8:10 pm - 8:19 am
EZE
-
STL
14h 09m
1 stop
$1,049LATAM Airlines
Sat, Jul 25 - Sat, Aug 1
Delta Logo
7:12 pm - 7:40 am
STL
-
AEP
34h 28m
2 stops
Delta Logo
3:45 pm - 12:34 pm
AEP
-
STL
22h 49m
2 stops
$1,105Delta
Sun, Jun 7 - Mon, Jun 15
Delta Logo
7:05 am - 7:40 am
STL
-
AEP
22h 35m
2 stops
Delta Logo
8:05 pm - 12:34 pm
AEP
-
STL
18h 29m
2 stops
$1,162Delta
Fri, Jun 5 - Mon, Jun 15
Delta Logo
5:20 pm - 4:00 pm
STL
-
AEP
20h 40m
2 stops
Delta Logo
3:45 pm - 12:34 pm
AEP
-
STL
22h 49m
2 stops
$1,227Delta
Fri, Jun 5 - Fri, Jun 12

American Airlines flights from St. Louis to Buenos Aires

Our best American Airlines deals on St. Louis to Buenos Aires flight tickets
American Airlines
Jun 8
STL1:19 pmLambert-St Louis
15h 46m
1 stop
EZE7:05 amBuenos Aires Ministro Pistarini
Jun 15
EZE10:05 pmBuenos Aires Ministro Pistarini
23h 31m
1 stop
STL7:36 pmLambert-St Louis
$909
American Airlines
Jun 8
STL2:58 pmLambert-St Louis
14h 07m
1 stop
EZE7:05 amBuenos Aires Ministro Pistarini
Jun 15
EZE8:35 pmBuenos Aires Ministro Pistarini
18h 14m
2 stops
STL12:49 pmLambert-St Louis
$913

Air Canada flights from St. Louis to Buenos Aires

Our best Air Canada deals on St. Louis to Buenos Aires flight tickets
Air Canada
Jun 6
STL1:05 pmLambert-St Louis
47h 25m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Jun 17
EZE4:35 pmBuenos Aires Ministro Pistarini
29h 50m
2 stops
STL8:25 pmLambert-St Louis
$1,157
Air Canada
Jun 10
STL8:40 amLambert-St Louis
30h 40m
2 stops
AEP5:20 pmBuenos Aires Jorge Newbery
Jun 12
AEP1:40 pmBuenos Aires Jorge Newbery
24h 26m
2 stops
STL12:06 pmLambert-St Louis
$2,215
Air Canada
Apr 24
STL9:10 amLambert-St Louis
27h 20m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Apr 29
EZE4:35 pmBuenos Aires Ministro Pistarini
24h 50m
2 stops
STL3:25 pmLambert-St Louis
$3,023

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 April 18, 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

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/8

1:19 pm-7:05 am

1 stop15h 46m

Buenos Aires Ministro Pistarini

Mon 6/15

10:05 pm-7:36 pm

1 stop23h 31m

$909
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/8

2:58 pm-7:05 am

1 stop14h 07m

Buenos Aires Ministro Pistarini

Mon 6/15

8:35 pm-12:49 pm

2 stops18h 14m

$913

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 7/25

10:16 am-6:21 pm

2 stops30h 05m

Buenos Aires Ministro Pistarini

Sun 8/2

1:10 pm-12:17 pm

2 stops25h 07m

$990

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 6/27

10:16 am-8:30 am

2 stops20h 14m

Buenos Aires Jorge Newbery

Sun 7/5

3:45 pm-12:34 pm

2 stops22h 49m

$1,013

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 6/27

8:00 am-6:10 am

2 stops20h 10m

Buenos Aires Ministro Pistarini

Sun 7/5

8:10 pm-8:16 am

1 stop14h 06m

$1,029

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 6/26

7:12 pm-9:45 am

1 stop12h 33m

Buenos Aires Ministro Pistarini

Sat 7/4

10:40 pm-6:07 pm

2 stops21h 27m

$1,033

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 7/25

10:16 am-9:45 am

1 stop21h 29m

Buenos Aires Ministro Pistarini

Sat 8/1

8:10 pm-8:19 am

1 stop14h 09m

$1,049

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 6/7

7:12 pm-7:40 am

2 stops34h 28m

Buenos Aires Jorge Newbery

Mon 6/15

3:45 pm-12:34 pm

2 stops22h 49m

$1,105

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 6/5

7:05 am-7:40 am

2 stops22h 35m

Buenos Aires Jorge Newbery

Mon 6/15

8:05 pm-12:34 pm

2 stops18h 29m

$1,162

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 6/5

5:20 pm-4:00 pm

2 stops20h 40m

Buenos Aires Jorge Newbery

Fri 6/12

3:45 pm-12:34 pm

2 stops22h 49m

$1,227

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 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 October. Flight prices, which tend to average around $1,160, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, 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 October, still average around $1,165.

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 33m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 33m
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 33m 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
1,908 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,421 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