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Cheap flights from St. Louis to Buenos Aires from $581

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 12/2. 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

Discover deals from 900+ travel sites with momondo.

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
11:51 am - 9:40 am
STL
-
EZE
18h 49m
2 stops
LATAM Airlines Logo
1:10 pm - 5:06 pm
EZE
-
STL
30h 56m
2 stops
$1,146LATAM Airlines
Wed, Dec 2 - Thu, Dec 17
LATAM Airlines Logo
4:40 pm - 4:00 pm
STL
-
AEP
20h 20m
2 stops
LATAM Airlines Logo
3:50 pm - 8:12 am
AEP
-
STL
19h 22m
2 stops
$1,148LATAM Airlines
Wed, Dec 2 - Thu, Dec 17
United Airlines Logo
11:00 am - 9:20 am
STL
-
EZE
19h 20m
1 stop
United Airlines Logo
11:55 pm - 4:44 pm
EZE
-
STL
19h 49m
1 stop
$1,148United Airlines
Wed, Dec 2 - Thu, Dec 17
LATAM Airlines Logo
7:05 pm - 4:00 pm
STL
-
AEP
18h 55m
2 stops
LATAM Airlines Logo
8:40 am - 5:06 pm
AEP
-
STL
35h 26m
2 stops
$1,178LATAM Airlines
Wed, Oct 28 - Sun, Nov 1
LATAM Airlines Logo
1:30 pm - 9:40 am
STL
-
EZE
17h 10m
2 stops
LATAM Airlines Logo
1:10 pm - 10:48 am
EZE
-
STL
24h 38m
2 stops
$1,178LATAM Airlines
Mon, Dec 14 - Mon, Jan 11
LATAM Airlines Logo
6:00 am - 6:45 pm
STL
-
EZE
33h 45m
2 stops
LATAM Airlines Logo
7:20 am - 11:39 pm
EZE
-
STL
19h 19m
2 stops
$1,198LATAM Airlines
Mon, Dec 14 - Wed, Jan 13
Delta Logo
10:45 am - 9:40 am
STL
-
EZE
19h 55m
2 stops
Delta Logo
7:20 am - 11:39 pm
EZE
-
STL
19h 19m
2 stops
$1,202Delta
Mon, Dec 14 - Wed, Jan 13
Delta Logo
10:31 am - 9:45 am
STL
-
EZE
21h 14m
1 stop
Delta Logo
3:35 pm - 8:09 am
EZE
-
STL
18h 34m
2 stops
$1,228Delta
Sat, Aug 22 - Sat, Aug 29
American Airlines Logo
11:35 am - 7:15 am
STL
-
EZE
17h 40m
1 stop
American Airlines Logo
10:30 pm - 10:45 am
EZE
-
STL
14h 15m
1 stop
$1,238American Airlines
Sat, Aug 22 - Sat, Aug 29
GOL Logo
4:36 pm - 12:35 pm
STL
-
AEP
16h 59m
2 stops
GOL Logo
6:05 pm - 11:05 am
AEP
-
STL
20h 00m
2 stops
$1,786GOL
Tue, Dec 15 - Wed, Jan 6

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Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Dec 14
STL10:45 amLambert-St Louis
19h 55m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Jan 13
EZE7:20 amBuenos Aires Ministro Pistarini
19h 19m
2 stops
STL11:39 pmLambert-St Louis
$1,202
Delta
Aug 22
STL10:31 amLambert-St Louis
21h 14m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Aug 29
EZE3:35 pmBuenos Aires Ministro Pistarini
18h 34m
2 stops
STL8:09 amLambert-St Louis
$1,228
Delta
Dec 13
STL6:00 amLambert-St Louis
24h 40m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Jan 13
EZE7:20 amBuenos Aires Ministro Pistarini
19h 19m
2 stops
STL11:39 pmLambert-St Louis
$1,242

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets
LATAM Airlines
Dec 2
STL11:51 amLambert-St Louis
18h 49m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Dec 17
EZE1:10 pmBuenos Aires Ministro Pistarini
30h 56m
2 stops
STL5:06 pmLambert-St Louis
$1,146
LATAM Airlines
Dec 2
STL4:40 pmLambert-St Louis
20h 20m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Dec 17
AEP3:50 pmBuenos Aires Jorge Newbery
19h 22m
2 stops
STL8:12 amLambert-St Louis
$1,148
LATAM Airlines
Dec 14
STL1:30 pmLambert-St Louis
17h 10m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Jan 11
EZE1:10 pmBuenos Aires Ministro Pistarini
24h 38m
2 stops
STL10:48 amLambert-St Louis
$1,178

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 July 1, 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

Wed 12/2

11:51 am-9:40 am

2 stops18h 49m

Buenos Aires Ministro Pistarini

Thu 12/17

1:10 pm-5:06 pm

2 stops30h 56m

$1,146

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 12/2

4:40 pm-4:00 pm

2 stops20h 20m

Buenos Aires Jorge Newbery

Thu 12/17

3:50 pm-8:12 am

2 stops19h 22m

$1,148

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 12/2

11:00 am-9:20 am

1 stop19h 20m

Buenos Aires Ministro Pistarini

Thu 12/17

11:55 pm-4:44 pm

1 stop19h 49m

$1,148

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 10/28

7:05 pm-4:00 pm

2 stops18h 55m

Buenos Aires Jorge Newbery

Sun 11/1

8:40 am-5:06 pm

2 stops35h 26m

$1,178

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 12/14

1:30 pm-9:40 am

2 stops17h 10m

Buenos Aires Ministro Pistarini

Mon 1/11

1:10 pm-10:48 am

2 stops24h 38m

$1,178

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 12/14

6:00 am-6:45 pm

2 stops33h 45m

Buenos Aires Ministro Pistarini

Wed 1/13

7:20 am-11:39 pm

2 stops19h 19m

$1,198

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 12/14

10:45 am-9:40 am

2 stops19h 55m

Buenos Aires Ministro Pistarini

Wed 1/13

7:20 am-11:39 pm

2 stops19h 19m

$1,202

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 8/22

10:31 am-9:45 am

1 stop21h 14m

Buenos Aires Ministro Pistarini

Sat 8/29

3:35 pm-8:09 am

2 stops18h 34m

$1,228
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 8/22

11:35 am-7:15 am

1 stop17h 40m

Buenos Aires Ministro Pistarini

Sat 8/29

10:30 pm-10:45 am

1 stop14h 15m

$1,238

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 12/15

4:36 pm-12:35 pm

2 stops16h 59m

Buenos Aires Jorge Newbery

Wed 1/6

6:05 pm-11:05 am

2 stops20h 00m

$1,786

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 $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

14h 47m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 14h 47m
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 14h 47m 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
1,944 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.8
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