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Cheap flights from St. Louis to Buenos Aires from $406

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 3/16. 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
5:21 pm - 7:55 am
STL
-
AEP
36h 34m
2 stops
LATAM Airlines Logo
5:00 pm - 11:09 am
AEP
-
STL
20h 09m
2 stops
$967LATAM Airlines
Wed, Mar 18 - Wed, Mar 25
LATAM Airlines Logo
6:50 pm - 9:45 am
STL
-
EZE
12h 55m
1 stop
LATAM Airlines Logo
8:10 pm - 9:36 am
EZE
-
STL
15h 26m
1 stop
$1,024LATAM Airlines
Tue, May 5 - Thu, May 14
LATAM Airlines Logo
5:30 pm - 9:45 am
STL
-
EZE
14h 15m
1 stop
LATAM Airlines Logo
8:10 pm - 10:41 am
EZE
-
STL
16h 31m
1 stop
$1,027LATAM Airlines
Tue, Aug 4 - Tue, Aug 25
Air Canada Logo
1:00 pm - 2:30 pm
STL
-
EZE
23h 30m
2 stops
Air Canada Logo
4:35 pm - 8:05 pm
EZE
-
STL
29h 30m
2 stops
$1,038Air Canada
Tue, May 5 - Thu, May 14
LATAM Airlines Logo
5:30 pm - 7:40 pm
STL
-
AEP
24h 10m
2 stops
LATAM Airlines Logo
5:05 pm - 10:41 am
AEP
-
STL
19h 36m
2 stops
$1,039LATAM Airlines
Tue, Aug 4 - Tue, Aug 25
LATAM Airlines Logo
6:00 am - 6:20 am
STL
-
EZE
22h 20m
2 stops
LATAM Airlines Logo
8:10 pm - 8:06 am
EZE
-
STL
13h 56m
1 stop
$1,039LATAM Airlines
Mon, Aug 10 - Thu, Aug 27
Air Canada Logo
4:05 pm - 2:30 pm
STL
-
EZE
20h 25m
2 stops
Air Canada Logo
4:35 pm - 8:05 pm
EZE
-
STL
53h 30m
3 stops
$1,042Air Canada
Tue, Mar 31 - Thu, May 7
Delta Logo
7:20 am - 6:10 am
STL
-
EZE
20h 50m
2 stops
Delta Logo
7:45 am - 11:37 pm
EZE
-
STL
17h 52m
2 stops
$1,047Delta
Wed, Aug 5 - Tue, Aug 25
United Airlines Logo
8:15 pm - 8:00 am
STL
-
EZE
33h 45m
2 stops
United Airlines Logo
9:00 pm - 9:42 am
EZE
-
STL
14h 42m
1 stop
$1,051United Airlines
Sun, Aug 9 - Wed, Aug 26
United Airlines Logo
6:30 pm - 8:00 am
STL
-
EZE
35h 30m
1 stop
United Airlines Logo
9:00 pm - 9:42 am
EZE
-
STL
14h 42m
1 stop
$1,056United Airlines
Sun, Aug 9 - Wed, Aug 26

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets
LATAM Airlines
Mar 18
STL12:04 pmLambert-St Louis
17h 16m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Mar 25
EZE8:55 pmBuenos Aires Ministro Pistarini
16h 14m
1 stop
STL11:09 amLambert-St Louis
$929
LATAM Airlines
Mar 18
STL5:21 pmLambert-St Louis
36h 34m
2 stops
AEP7:55 amBuenos Aires Jorge Newbery
Mar 25
AEP5:00 pmBuenos Aires Jorge Newbery
20h 09m
2 stops
STL11:09 amLambert-St Louis
$967
LATAM Airlines
May 5
STL6:50 pmLambert-St Louis
12h 55m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
May 14
EZE8:10 pmBuenos Aires Ministro Pistarini
15h 26m
1 stop
STL9:36 amLambert-St Louis
$1,024

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Mar 18
STL10:05 amLambert-St Louis
18h 15m
1 stop
EZE6:20 amBuenos Aires Ministro Pistarini
Mar 25
EZE9:05 pmBuenos Aires Ministro Pistarini
14h 16m
1 stop
STL9:21 amLambert-St Louis
$937
United Airlines
Mar 18
STL8:17 amLambert-St Louis
20h 03m
2 stops
EZE6:20 amBuenos Aires Ministro Pistarini
Mar 25
EZE9:05 pmBuenos Aires Ministro Pistarini
17h 22m
2 stops
STL12:27 pmLambert-St Louis
$941
United Airlines
Aug 9
STL8:15 pmLambert-St Louis
33h 45m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
Aug 26
EZE9:00 pmBuenos Aires Ministro Pistarini
20h 38m
2 stops
STL3:38 pmLambert-St Louis
$1,051

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 February 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

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 3/18

5:21 pm-7:55 am

2 stops36h 34m

Buenos Aires Jorge Newbery

Wed 3/25

5:00 pm-11:09 am

2 stops20h 09m

$967

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 5/5

6:50 pm-9:45 am

1 stop12h 55m

Buenos Aires Ministro Pistarini

Thu 5/14

8:10 pm-9:36 am

1 stop15h 26m

$1,024

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 8/4

5:30 pm-9:45 am

1 stop14h 15m

Buenos Aires Ministro Pistarini

Tue 8/25

8:10 pm-10:41 am

1 stop16h 31m

$1,027

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 5/5

1:00 pm-2:30 pm

2 stops23h 30m

Buenos Aires Ministro Pistarini

Thu 5/14

4:35 pm-8:05 pm

2 stops29h 30m

$1,038

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 8/4

5:30 pm-7:40 pm

2 stops24h 10m

Buenos Aires Jorge Newbery

Tue 8/25

5:05 pm-10:41 am

2 stops19h 36m

$1,039

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 8/10

6:00 am-6:20 am

2 stops22h 20m

Buenos Aires Ministro Pistarini

Thu 8/27

8:10 pm-8:06 am

1 stop13h 56m

$1,039

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/31

4:05 pm-2:30 pm

2 stops20h 25m

Buenos Aires Ministro Pistarini

Thu 5/7

4:35 pm-8:05 pm

3 stops53h 30m

$1,042

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 8/5

7:20 am-6:10 am

2 stops20h 50m

Buenos Aires Ministro Pistarini

Tue 8/25

7:45 am-11:37 pm

2 stops17h 52m

$1,047

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 8/9

8:15 pm-8:00 am

2 stops33h 45m

Buenos Aires Ministro Pistarini

Wed 8/26

9:00 pm-9:42 am

1 stop14h 42m

$1,051

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 8/9

6:30 pm-8:00 am

1 stop35h 30m

Buenos Aires Ministro Pistarini

Wed 8/26

9:00 pm-9:42 am

1 stop14h 42m

$1,056

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 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 $1,056, 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 October instead. Flights to Buenos Aires in October, while not as cheap as those in September, still average around $1,160.

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 46m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 46m
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

  • 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 46m 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
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,207 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