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Cheap flights from St. Louis to Buenos Aires from $381

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 6/13. 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.
LATAM Airlines Logo
6:58 pm - 9:45 am
STL
-
EZE
12h 47m
1 stop
LATAM Airlines Logo
7:35 am - 11:58 pm
EZE
-
STL
18h 23m
2 stops
$1,139LATAM Airlines
Mon, Jul 27 - Tue, Aug 11
Delta Logo
6:58 pm - 9:45 am
STL
-
EZE
12h 47m
1 stop
Delta Logo
8:10 pm - 2:33 pm
EZE
-
STL
20h 23m
1 stop
$1,147Delta
Mon, Jul 27 - Mon, Aug 10
LATAM Airlines Logo
3:57 pm - 9:40 am
STL
-
EZE
15h 43m
2 stops
LATAM Airlines Logo
10:40 pm - 12:17 pm
EZE
-
STL
15h 37m
2 stops
$1,150LATAM Airlines
Tue, Jun 30 - Wed, Jul 8
United Airlines Logo
5:33 pm - 8:00 am
STL
-
EZE
36h 27m
2 stops
United Airlines Logo
9:00 pm - 2:28 pm
EZE
-
STL
19h 28m
2 stops
$1,151United Airlines
Mon, Jul 27 - Mon, Aug 10
United Airlines Logo
6:14 am - 8:00 am
STL
-
EZE
23h 46m
1 stop
United Airlines Logo
9:00 pm - 10:07 am
EZE
-
STL
15h 07m
1 stop
$1,162United Airlines
Mon, Jun 22 - Mon, Jun 29
United Airlines Logo
5:29 pm - 8:00 am
STL
-
EZE
36h 31m
2 stops
United Airlines Logo
9:00 pm - 10:07 am
EZE
-
STL
15h 07m
1 stop
$1,166United Airlines
Mon, Jun 22 - Mon, Jun 29
American Airlines Logo
11:15 am - 8:50 am
STL
-
EZE
19h 35m
1 stop
American Airlines Logo
10:00 pm - 7:51 pm
EZE
-
STL
23h 51m
1 stop
$1,172American Airlines
Tue, Jun 30 - Wed, Jul 8
United Airlines Logo
2:57 pm - 8:00 am
STL
-
EZE
15h 03m
1 stop
United Airlines Logo
9:00 pm - 10:07 am
EZE
-
STL
15h 07m
1 stop
$1,177United Airlines
Mon, Jun 8 - Mon, Jun 15
LATAM Airlines Logo
6:58 pm - 9:45 am
STL
-
EZE
12h 47m
1 stop
LATAM Airlines Logo
7:35 am - 11:58 pm
EZE
-
STL
18h 23m
2 stops
$1,179LATAM Airlines
Fri, Jul 24 - Tue, Aug 11
United Airlines Logo
1:13 pm - 8:00 am
STL
-
EZE
16h 47m
2 stops
United Airlines Logo
9:00 pm - 2:23 pm
EZE
-
STL
19h 23m
2 stops
$1,181United Airlines
Mon, Jun 8 - Mon, Jun 15

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets
LATAM Airlines
Jul 27
STL6:58 pmLambert-St Louis
12h 47m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Aug 11
EZE7:35 amBuenos Aires Ministro Pistarini
18h 23m
2 stops
STL11:58 pmLambert-St Louis
$1,139
LATAM Airlines
Jul 24
STL6:58 pmLambert-St Louis
12h 47m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Aug 11
EZE7:35 amBuenos Aires Ministro Pistarini
18h 23m
2 stops
STL11:58 pmLambert-St Louis
$1,179
LATAM Airlines
Jul 27
STL6:58 pmLambert-St Louis
12h 47m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Aug 10
EZE8:10 pmBuenos Aires Ministro Pistarini
17h 36m
1 stop
STL11:46 amLambert-St Louis
$1,197

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 23
STL11:15 amLambert-St Louis
17h 50m
1 stop
EZE7:05 amBuenos Aires Ministro Pistarini
Jul 2
EZE10:35 pmBuenos Aires Ministro Pistarini
13h 49m
1 stop
STL10:24 amLambert-St Louis
$1,252
American Airlines
Jun 23
STL10:45 amLambert-St Louis
18h 20m
2 stops
EZE7:05 amBuenos Aires Ministro Pistarini
Jul 2
EZE10:35 pmBuenos Aires Ministro Pistarini
20h 47m
2 stops
STL5:22 pmLambert-St Louis
$1,256
American Airlines
Jun 28
STL5:16 amLambert-St Louis
12h 59m
1 stop
EZE8:15 pmBuenos Aires Ministro Pistarini
Jul 10
EZE10:00 pmBuenos Aires Ministro Pistarini
16h 44m
1 stop
STL12:44 pmLambert-St Louis
$1,337

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 May 13, 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 7/27

6:58 pm-9:45 am

1 stop12h 47m

Buenos Aires Ministro Pistarini

Tue 8/11

7:35 am-11:58 pm

2 stops18h 23m

$1,139

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 7/27

6:58 pm-9:45 am

1 stop12h 47m

Buenos Aires Ministro Pistarini

Mon 8/10

8:10 pm-2:33 pm

1 stop20h 23m

$1,147

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 6/30

3:57 pm-9:40 am

2 stops15h 43m

Buenos Aires Ministro Pistarini

Wed 7/8

10:40 pm-12:17 pm

2 stops15h 37m

$1,150

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 7/27

5:33 pm-8:00 am

2 stops36h 27m

Buenos Aires Ministro Pistarini

Mon 8/10

9:00 pm-2:28 pm

2 stops19h 28m

$1,151

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/22

6:14 am-8:00 am

1 stop23h 46m

Buenos Aires Ministro Pistarini

Mon 6/29

9:00 pm-10:07 am

1 stop15h 07m

$1,162

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/22

5:29 pm-8:00 am

2 stops36h 31m

Buenos Aires Ministro Pistarini

Mon 6/29

9:00 pm-10:07 am

1 stop15h 07m

$1,166

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 6/30

11:15 am-8:50 am

1 stop19h 35m

Buenos Aires Ministro Pistarini

Wed 7/8

10:00 pm-7:51 pm

1 stop23h 51m

$1,172
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/8

2:57 pm-8:00 am

1 stop15h 03m

Buenos Aires Ministro Pistarini

Mon 6/15

9:00 pm-10:07 am

1 stop15h 07m

$1,177

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 7/24

6:58 pm-9:45 am

1 stop12h 47m

Buenos Aires Ministro Pistarini

Tue 8/11

7:35 am-11:58 pm

2 stops18h 23m

$1,179

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/8

1:13 pm-8:00 am

2 stops16h 47m

Buenos Aires Ministro Pistarini

Mon 6/15

9:00 pm-2:23 pm

2 stops19h 23m

$1,181

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Buenos Aires from

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 $829, 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 February instead. Flights to Buenos Aires in February, while not as cheap as those in October, still average around $884.

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 40m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 40m
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 40m 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
1,922 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,452 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