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Cheap flights from St. Louis to Buenos Aires from $355

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 10/8. 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
5:28 pm - 4:00 pm
STL
-
AEP
20h 32m
2 stops
LATAM Airlines Logo
8:05 pm - 11:39 pm
AEP
-
STL
30h 34m
2 stops
$1,129LATAM Airlines
Wed, Oct 28 - Sun, Nov 8
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
$1,133LATAM Airlines
Wed, Dec 2 - Thu, Dec 17
Delta Logo
4:13 pm - 10:55 am
STL
-
EZE
15h 42m
1 stop
Delta Logo
7:20 am - 12:36 am
EZE
-
STL
20h 16m
2 stops
$1,148Delta
Wed, Dec 2 - Thu, Dec 17
LATAM Airlines Logo
1:30 pm - 4:00 pm
STL
-
AEP
23h 30m
2 stops
LATAM Airlines Logo
9:25 am - 10:48 am
AEP
-
STL
28h 23m
2 stops
$1,148LATAM Airlines
Wed, Dec 2 - Thu, Dec 17
LATAM Airlines Logo
2:25 pm - 4:00 pm
STL
-
AEP
23h 35m
2 stops
LATAM Airlines Logo
8:05 pm - 11:39 pm
AEP
-
STL
30h 34m
2 stops
$1,151LATAM Airlines
Fri, Oct 16 - Sun, Nov 22
American Airlines Logo
5:00 am - 6:00 am
STL
-
EZE
23h 00m
1 stop
American Airlines Logo
10:15 pm - 1:21 pm
EZE
-
STL
17h 06m
1 stop
$1,218American Airlines
Fri, Sep 4 - Sun, Sep 13
American Airlines Logo
8:36 am - 6:00 am
STL
-
EZE
19h 24m
2 stops
American Airlines Logo
10:15 pm - 1:21 pm
EZE
-
STL
17h 06m
1 stop
$1,222American Airlines
Fri, Sep 4 - Sun, Sep 13
Multiple Airlines Logo
2:40 pm - 1:20 am
STL
-
EZE
32h 40m
3 stops
Multiple Airlines Logo
6:00 am - 2:00 pm
EZE
-
STL
34h 00m
3 stops
$1,233Multiple Airlines
Tue, Sep 22 - Mon, Oct 5
Multiple Airlines Logo
4:05 pm - 7:40 pm
STL
-
AEP
25h 35m
3 stops
Multiple Airlines Logo
7:00 am - 3:26 pm
AEP
-
STL
35h 26m
3 stops
$1,438Multiple Airlines
Tue, Oct 27 - Tue, Nov 3

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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
Oct 28
STL5:28 pmLambert-St Louis
20h 32m
2 stops
AEP4:00 pmBuenos Aires Jorge Newbery
Nov 8
AEP8:05 pmBuenos Aires Jorge Newbery
30h 34m
2 stops
STL11:39 pmLambert-St Louis
$1,129
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
$1,133

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Dec 2
STL4:13 pmLambert-St Louis
15h 42m
1 stop
EZE10:55 amBuenos Aires Ministro Pistarini
Dec 17
EZE7:20 amBuenos Aires Ministro Pistarini
20h 16m
2 stops
STL12:36 amLambert-St Louis
$1,148
Delta
Aug 15
STL3:44 pmLambert-St Louis
16h 01m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Aug 25
EZE2:55 pmBuenos Aires Ministro Pistarini
19h 13m
2 stops
STL8:08 amLambert-St Louis
$1,258
Delta
Jul 27
STL1:22 pmLambert-St Louis
18h 18m
2 stops
AEP9:40 amBuenos Aires Jorge Newbery
Aug 27
AEP8:05 pmBuenos Aires Jorge Newbery
20h 28m
2 stops
STL2:33 pmLambert-St Louis
$1,441

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 25, 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 10/28

5:28 pm-4:00 pm

2 stops20h 32m

Buenos Aires Jorge Newbery

Sun 11/8

8:05 pm-11:39 pm

2 stops30h 34m

$1,129

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

$1,133
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 12/2

4:13 pm-10:55 am

1 stop15h 42m

Buenos Aires Ministro Pistarini

Thu 12/17

7:20 am-12:36 am

2 stops20h 16m

$1,148

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 12/2

1:30 pm-4:00 pm

2 stops23h 30m

Buenos Aires Jorge Newbery

Thu 12/17

9:25 am-10:48 am

2 stops28h 23m

$1,148

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 10/16

2:25 pm-4:00 pm

2 stops23h 35m

Buenos Aires Jorge Newbery

Sun 11/22

8:05 pm-11:39 pm

2 stops30h 34m

$1,151

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 9/4

5:00 am-6:00 am

1 stop23h 00m

Buenos Aires Ministro Pistarini

Sun 9/13

10:15 pm-1:21 pm

1 stop17h 06m

$1,218

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 9/4

8:36 am-6:00 am

2 stops19h 24m

Buenos Aires Ministro Pistarini

Sun 9/13

10:15 pm-1:21 pm

1 stop17h 06m

$1,222

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 9/22

2:40 pm-1:20 am

3 stops32h 40m

Buenos Aires Ministro Pistarini

Mon 10/5

6:00 am-2:00 pm

3 stops34h 00m

$1,233

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 10/27

4:05 pm-7:40 pm

3 stops25h 35m

Buenos Aires Jorge Newbery

Tue 11/3

7:00 am-3:26 pm

3 stops35h 26m

$1,438

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 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 $0, 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 April instead. Flights to Buenos Aires in April, while not as cheap as those in September, still average around $0.

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 10m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 17h 10m
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 10m 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
1,965 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.8
8,485 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