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Cheap flights from St. Louis to Buenos Aires from $892

This is the cheapest round-trip 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 6/4. 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
5:20 pm - 9:45 am
STL
-
EZE
14h 25m
1 stop
LATAM Airlines Logo
8:10 pm - 8:16 am
EZE
-
STL
14h 06m
1 stop
$892LATAM Airlines
Thu, Jun 4 - Thu, Jun 18
LATAM Airlines Logo
10:49 am - 7:40 am
STL
-
AEP
18h 51m
2 stops
LATAM Airlines Logo
2:55 pm - 8:16 am
AEP
-
STL
19h 21m
2 stops
$911LATAM Airlines
Thu, Jun 4 - Thu, Jun 18
LATAM Airlines Logo
5:20 pm - 11:30 am
STL
-
EZE
16h 10m
2 stops
LATAM Airlines Logo
8:10 pm - 8:16 am
EZE
-
STL
14h 06m
1 stop
$911LATAM Airlines
Thu, Jun 4 - Thu, Jun 18
Delta Logo
5:20 pm - 9:20 am
STL
-
EZE
14h 00m
2 stops
Delta Logo
10:40 pm - 6:07 pm
EZE
-
STL
21h 27m
2 stops
$913Delta
Thu, Jun 4 - Thu, Jun 18
LATAM Airlines Logo
12:59 pm - 9:20 am
STL
-
EZE
18h 21m
2 stops
LATAM Airlines Logo
10:40 pm - 6:07 pm
EZE
-
STL
21h 27m
2 stops
$1,033LATAM Airlines
Sat, Jun 6 - Sat, Jun 13
LATAM Airlines Logo
5:20 pm - 9:45 am
STL
-
EZE
14h 25m
1 stop
LATAM Airlines Logo
3:55 am - 11:56 pm
EZE
-
STL
22h 01m
2 stops
$1,119LATAM Airlines
Mon, Jun 1 - Mon, Jun 8
United Airlines Logo
11:10 am - 8:00 am
STL
-
EZE
18h 50m
1 stop
United Airlines Logo
9:00 pm - 10:07 am
EZE
-
STL
15h 07m
1 stop
$1,127United Airlines
Mon, Jun 1 - Tue, Jun 9
Multiple Airlines Logo
2:15 pm - 3:45 am
STL
-
EZE
35h 30m
3 stops
Multiple Airlines Logo
7:10 am - 12:06 pm
EZE
-
STL
30h 56m
3 stops
$1,183Multiple Airlines
Mon, Jun 1 - Tue, Jun 9
Multiple Airlines Logo
6:30 am - 2:35 am
STL
-
EZE
18h 05m
1 stop
Multiple Airlines Logo
2:45 am - 8:52 am
EZE
-
STL
32h 07m
2 stops
$1,185Multiple Airlines
Wed, Aug 12 - Mon, Aug 17
Multiple Airlines Logo
2:15 pm - 1:20 am
STL
-
EZE
33h 05m
3 stops
Multiple Airlines Logo
7:10 am - 12:06 pm
EZE
-
STL
30h 56m
3 stops
$1,186Multiple Airlines
Sat, Jun 6 - Sat, Jun 13

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets
LATAM Airlines
Jun 4
STL5:20 pmLambert-St Louis
14h 25m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Jun 18
EZE8:10 pmBuenos Aires Ministro Pistarini
14h 06m
1 stop
STL8:16 amLambert-St Louis
$892
LATAM Airlines
Jun 11
STL1:39 pmLambert-St Louis
18h 01m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Jun 18
EZE10:40 pmBuenos Aires Ministro Pistarini
21h 27m
2 stops
STL6:07 pmLambert-St Louis
$894
LATAM Airlines
Jun 11
STL1:39 pmLambert-St Louis
18h 06m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Jun 18
EZE8:10 pmBuenos Aires Ministro Pistarini
14h 06m
1 stop
STL8:16 amLambert-St Louis
$909

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Jun 4
STL5:20 pmLambert-St Louis
14h 00m
2 stops
EZE9:20 amBuenos Aires Ministro Pistarini
Jun 18
EZE10:40 pmBuenos Aires Ministro Pistarini
21h 27m
2 stops
STL6:07 pmLambert-St Louis
$913
Delta
May 30
STL7:05 pmLambert-St Louis
18h 55m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Jun 4
AEP3:45 pmBuenos Aires Jorge Newbery
19h 59m
2 stops
STL9:44 amLambert-St Louis
$1,627
Delta
May 22
STL9:13 amLambert-St Louis
20h 27m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
May 29
AEP8:05 pmBuenos Aires Jorge Newbery
20h 43m
2 stops
STL2:48 pmLambert-St Louis
$1,638

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 April 27, 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
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 6/4

5:20 pm-9:45 am

1 stop14h 25m

Buenos Aires Ministro Pistarini

Thu 6/18

8:10 pm-8:16 am

1 stop14h 06m

$892

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 6/4

10:49 am-7:40 am

2 stops18h 51m

Buenos Aires Jorge Newbery

Thu 6/18

2:55 pm-8:16 am

2 stops19h 21m

$911

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 6/4

5:20 pm-11:30 am

2 stops16h 10m

Buenos Aires Ministro Pistarini

Thu 6/18

8:10 pm-8:16 am

1 stop14h 06m

$911

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 6/4

5:20 pm-9:20 am

2 stops14h 00m

Buenos Aires Ministro Pistarini

Thu 6/18

10:40 pm-6:07 pm

2 stops21h 27m

$913

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 6/6

12:59 pm-9:20 am

2 stops18h 21m

Buenos Aires Ministro Pistarini

Sat 6/13

10:40 pm-6:07 pm

2 stops21h 27m

$1,033

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/1

5:20 pm-9:45 am

1 stop14h 25m

Buenos Aires Ministro Pistarini

Mon 6/8

3:55 am-11:56 pm

2 stops22h 01m

$1,119

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/1

11:10 am-8:00 am

1 stop18h 50m

Buenos Aires Ministro Pistarini

Tue 6/9

9:00 pm-10:07 am

1 stop15h 07m

$1,127

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 6/1

2:15 pm-3:45 am

3 stops35h 30m

Buenos Aires Ministro Pistarini

Tue 6/9

7:10 am-12:06 pm

3 stops30h 56m

$1,183

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 8/12

6:30 am-2:35 am

1 stop18h 05m

Buenos Aires Ministro Pistarini

Mon 8/17

2:45 am-8:52 am

2 stops32h 07m

$1,185

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 6/6

2:15 pm-1:20 am

3 stops33h 05m

Buenos Aires Ministro Pistarini

Sat 6/13

7:10 am-12:06 pm

3 stops30h 56m

$1,186

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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

17h 49m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 17h 49m
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 17h 49m 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
1,913 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,463 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