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Cheap flights from St. Louis to Buenos Aires from $331

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 8/9. 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

Enter your travel dates to find the best prices.
LATAM Airlines Logo
9:00 am - 9:40 am
STL
-
EZE
21h 40m
2 stops
LATAM Airlines Logo
7:20 am - 11:39 pm
EZE
-
STL
19h 19m
2 stops
$1,126LATAM Airlines
Wed, Dec 2 - Thu, Dec 17
LATAM Airlines Logo
3:40 pm - 7:40 pm
STL
-
AEP
25h 00m
2 stops
LATAM Airlines Logo
8:05 pm - 5:06 pm
AEP
-
STL
24h 01m
2 stops
$1,148LATAM Airlines
Wed, Jan 6 - Tue, Jan 19
Delta Logo
5:28 pm - 9:45 am
STL
-
EZE
14h 17m
1 stop
Delta Logo
11:35 pm - 12:56 pm
EZE
-
STL
16h 21m
1 stop
$1,148Delta
Mon, Oct 19 - Thu, Nov 12
Delta Logo
11:51 am - 7:35 am
STL
-
EZE
16h 44m
1 stop
Delta Logo
1:10 pm - 10:48 am
EZE
-
STL
24h 38m
2 stops
$1,152Delta
Wed, Jan 6 - Mon, Jan 18
Delta Logo
5:28 pm - 4:00 pm
STL
-
EZE
44h 32m
2 stops
Delta Logo
9:30 pm - 8:12 am
EZE
-
STL
13h 42m
1 stop
$1,156Delta
Sun, Oct 25 - Wed, Nov 18
LATAM Airlines Logo
2:30 pm - 9:40 am
STL
-
EZE
17h 10m
2 stops
LATAM Airlines Logo
1:10 pm - 10:55 am
EZE
-
STL
23h 45m
2 stops
$1,158LATAM Airlines
Mon, Sep 14 - Mon, Sep 21
Delta Logo
6:59 pm - 7:35 am
STL
-
EZE
33h 36m
1 stop
Delta Logo
1:10 pm - 10:48 am
EZE
-
STL
24h 38m
2 stops
$1,161Delta
Sun, Jan 10 - Mon, Jan 18
LATAM Airlines Logo
12:00 pm - 9:40 am
STL
-
EZE
19h 40m
2 stops
LATAM Airlines Logo
7:20 am - 11:39 pm
EZE
-
STL
19h 19m
2 stops
$1,164LATAM Airlines
Thu, Oct 22 - Sun, Nov 15
United Airlines Logo
8:50 am - 7:20 am
STL
-
EZE
19h 30m
1 stop
United Airlines Logo
11:55 pm - 4:44 pm
EZE
-
STL
19h 49m
1 stop
$1,173United Airlines
Wed, Jan 6 - Tue, Jan 19
United Airlines Logo
6:50 pm - 7:20 am
STL
-
EZE
33h 30m
2 stops
United Airlines Logo
11:55 pm - 10:19 pm
EZE
-
STL
25h 24m
1 stop
$1,179United Airlines
Mon, Dec 21 - Wed, Dec 30

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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
STL9:00 amLambert-St Louis
21h 40m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Dec 17
EZE7:20 amBuenos Aires Ministro Pistarini
19h 19m
2 stops
STL11:39 pmLambert-St Louis
$1,126
LATAM Airlines
Jan 6
STL9:00 amLambert-St Louis
19h 40m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Jan 14
AEP9:25 amBuenos Aires Jorge Newbery
25h 47m
2 stops
STL8:12 amLambert-St Louis
$1,148
LATAM Airlines
Sep 14
STL2:30 pmLambert-St Louis
17h 10m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Sep 21
EZE1:10 pmBuenos Aires Ministro Pistarini
23h 45m
2 stops
STL10:55 amLambert-St Louis
$1,158

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Jan 6
STL8:50 amLambert-St Louis
19h 30m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Jan 19
EZE11:55 pmBuenos Aires Ministro Pistarini
19h 49m
1 stop
STL4:44 pmLambert-St Louis
$1,173
United Airlines
Dec 21
STL6:50 pmLambert-St Louis
33h 30m
2 stops
EZE7:20 amBuenos Aires Ministro Pistarini
Dec 30
EZE11:55 pmBuenos Aires Ministro Pistarini
25h 24m
1 stop
STL10:19 pmLambert-St Louis
$1,179
United Airlines
Dec 22
STL6:15 amLambert-St Louis
22h 05m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Dec 30
EZE11:55 pmBuenos Aires Ministro Pistarini
25h 24m
1 stop
STL10:19 pmLambert-St Louis
$1,182

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 20, 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

9:00 am-9:40 am

2 stops21h 40m

Buenos Aires Ministro Pistarini

Thu 12/17

7:20 am-11:39 pm

2 stops19h 19m

$1,126

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 1/6

3:40 pm-7:40 pm

2 stops25h 00m

Buenos Aires Jorge Newbery

Tue 1/19

8:05 pm-5:06 pm

2 stops24h 01m

$1,148
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 10/19

5:28 pm-9:45 am

1 stop14h 17m

Buenos Aires Ministro Pistarini

Thu 11/12

11:35 pm-12:56 pm

1 stop16h 21m

$1,148

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 1/6

11:51 am-7:35 am

1 stop16h 44m

Buenos Aires Ministro Pistarini

Mon 1/18

1:10 pm-10:48 am

2 stops24h 38m

$1,152

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 10/25

5:28 pm-4:00 pm

2 stops44h 32m

Buenos Aires Ministro Pistarini

Wed 11/18

9:30 pm-8:12 am

1 stop13h 42m

$1,156

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 9/14

2:30 pm-9:40 am

2 stops17h 10m

Buenos Aires Ministro Pistarini

Mon 9/21

1:10 pm-10:55 am

2 stops23h 45m

$1,158

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 1/10

6:59 pm-7:35 am

1 stop33h 36m

Buenos Aires Ministro Pistarini

Mon 1/18

1:10 pm-10:48 am

2 stops24h 38m

$1,161

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 10/22

12:00 pm-9:40 am

2 stops19h 40m

Buenos Aires Ministro Pistarini

Sun 11/15

7:20 am-11:39 pm

2 stops19h 19m

$1,164

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 1/6

8:50 am-7:20 am

1 stop19h 30m

Buenos Aires Ministro Pistarini

Tue 1/19

11:55 pm-4:44 pm

1 stop19h 49m

$1,173

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 12/21

6:50 pm-7:20 am

2 stops33h 30m

Buenos Aires Ministro Pistarini

Wed 12/30

11:55 pm-10:19 pm

1 stop25h 24m

$1,179

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 airline that flies from Lambert-St Louis to Buenos Aires?

Avianca and LATAM Airlines are the most popular carriers operating from Lambert-St Louis to Buenos Aires

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 51m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 51m
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 51m 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
1,961 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.8
8,476 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