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Cheap flights from St. Louis to Buenos Aires from $429

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 7/20. 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
7:05 pm - 4:00 pm
STL
-
AEP
18h 55m
2 stops
LATAM Airlines Logo
2:55 pm - 10:48 am
AEP
-
STL
22h 53m
2 stops
$1,148LATAM Airlines
Wed, Oct 28 - Wed, Nov 11
Delta Logo
11:51 am - 6:20 am
STL
-
EZE
16h 29m
2 stops
Delta Logo
3:35 pm - 8:12 am
EZE
-
STL
19h 37m
2 stops
$1,148Delta
Wed, Oct 28 - Wed, Nov 11
LATAM Airlines Logo
1:30 pm - 9:40 am
STL
-
EZE
17h 10m
2 stops
LATAM Airlines Logo
7:45 am - 10:48 am
EZE
-
STL
30h 03m
3 stops
$1,155LATAM Airlines
Mon, Dec 14 - Wed, Jan 13
LATAM Airlines Logo
1:22 pm - 9:40 am
STL
-
EZE
18h 18m
2 stops
LATAM Airlines Logo
1:10 pm - 9:43 am
EZE
-
STL
22h 33m
2 stops
$1,177LATAM Airlines
Thu, Jul 16 - Thu, Jul 30
LATAM Airlines Logo
6:58 pm - 9:45 am
STL
-
EZE
12h 47m
1 stop
LATAM Airlines Logo
8:10 pm - 8:19 am
EZE
-
STL
14h 09m
1 stop
$1,178LATAM Airlines
Thu, Jul 16 - Thu, Jul 30
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
$1,180LATAM Airlines
Mon, Dec 14 - Mon, Jan 11
United Airlines Logo
2:57 pm - 8:00 am
STL
-
EZE
15h 03m
1 stop
United Airlines Logo
9:00 pm - 11:29 pm
EZE
-
STL
28h 29m
2 stops
$1,182United Airlines
Thu, Jul 16 - Thu, Jul 30
LATAM Airlines Logo
6:00 am - 12:22 pm
STL
-
EZE
27h 22m
2 stops
LATAM Airlines Logo
7:45 am - 10:48 am
EZE
-
STL
30h 03m
3 stops
$1,191LATAM Airlines
Sun, Dec 13 - Wed, Jan 13
United Airlines Logo
11:25 am - 8:00 am
STL
-
EZE
18h 35m
2 stops
United Airlines Logo
9:00 pm - 12:11 pm
EZE
-
STL
41h 11m
2 stops
$1,200United Airlines
Mon, Jul 13 - Mon, Jul 20
Delta Logo
6:00 am - 9:40 am
STL
-
EZE
24h 40m
2 stops
Delta Logo
1:10 pm - 10:48 am
EZE
-
STL
24h 38m
2 stops
$1,202Delta
Mon, Dec 14 - Tue, Jan 12

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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
Oct 28
STL7:05 pmLambert-St Louis
18h 55m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Nov 11
AEP2:55 pmBuenos Aires Jorge Newbery
22h 53m
2 stops
STL10:48 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 13
EZE7:45 amBuenos Aires Ministro Pistarini
30h 03m
3 stops
STL10:48 amLambert-St Louis
$1,155
LATAM Airlines
Jul 16
STL1:22 pmLambert-St Louis
18h 18m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Jul 30
EZE1:10 pmBuenos Aires Ministro Pistarini
22h 33m
2 stops
STL9:43 amLambert-St Louis
$1,177

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Jul 16
STL2:57 pmLambert-St Louis
15h 03m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Jul 30
EZE9:00 pmBuenos Aires Ministro Pistarini
28h 29m
2 stops
STL11:29 pmLambert-St Louis
$1,182
United Airlines
Jul 13
STL8:35 amLambert-St Louis
21h 25m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Jul 20
EZE9:00 pmBuenos Aires Ministro Pistarini
37h 49m
2 stops
STL8:49 amLambert-St Louis
$1,200
United Airlines
Dec 10
STL6:15 amLambert-St Louis
22h 05m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Dec 19
EZE11:55 pmBuenos Aires Ministro Pistarini
41h 23m
2 stops
STL2:18 pmLambert-St Louis
$1,215

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 June 17, 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 - AEP

STLAEP

Lambert-St Louis

Wed 10/28

7:05 pm-4:00 pm

2 stops18h 55m

Buenos Aires Jorge Newbery

Wed 11/11

2:55 pm-10:48 am

2 stops22h 53m

$1,148

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 10/28

11:51 am-6:20 am

2 stops16h 29m

Buenos Aires Ministro Pistarini

Wed 11/11

3:35 pm-8:12 am

2 stops19h 37m

$1,148

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

Wed 1/13

7:45 am-10:48 am

3 stops30h 03m

$1,155

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 7/16

1:22 pm-9:40 am

2 stops18h 18m

Buenos Aires Ministro Pistarini

Thu 7/30

1:10 pm-9:43 am

2 stops22h 33m

$1,177
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 7/16

6:58 pm-9:45 am

1 stop12h 47m

Buenos Aires Ministro Pistarini

Thu 7/30

8:10 pm-8:19 am

1 stop14h 09m

$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

$1,180

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 7/16

2:57 pm-8:00 am

1 stop15h 03m

Buenos Aires Ministro Pistarini

Thu 7/30

9:00 pm-11:29 pm

2 stops28h 29m

$1,182

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 12/13

6:00 am-12:22 pm

2 stops27h 22m

Buenos Aires Ministro Pistarini

Wed 1/13

7:45 am-10:48 am

3 stops30h 03m

$1,191

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 7/13

11:25 am-8:00 am

2 stops18h 35m

Buenos Aires Ministro Pistarini

Mon 7/20

9:00 pm-12:11 pm

2 stops41h 11m

$1,200

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 12/14

6:00 am-9:40 am

2 stops24h 40m

Buenos Aires Ministro Pistarini

Tue 1/12

1:10 pm-10:48 am

2 stops24h 38m

$1,202

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

12h 47m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 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 12h 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
1,933 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.8
8,406 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