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Cheap flights from St. Louis to Buenos Aires from $478

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 6/17. 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.
Multiple Airlines Logo
2:15 pm - 1:20 am
STL
-
EZE
33h 05m
3 stops
Multiple Airlines Logo
2:30 am - 12:21 pm
EZE
-
STL
35h 51m
3 stops
$1,188Multiple Airlines
Wed, Jun 17 - Mon, Jun 22
Multiple Airlines Logo
2:15 pm - 3:45 am
STL
-
EZE
35h 30m
2 stops
Multiple Airlines Logo
7:10 am - 12:21 pm
EZE
-
STL
31h 11m
3 stops
$1,242Multiple Airlines
Wed, Jun 17 - Tue, Jun 23
LATAM Airlines Logo
7:12 pm - 4:00 pm
STL
-
AEP
18h 48m
2 stops
LATAM Airlines Logo
5:35 pm - 5:53 pm
AEP
-
STL
26h 18m
2 stops
$1,338LATAM Airlines
Sun, Jul 5 - Sun, Jul 12
United Airlines Logo
7:05 pm - 8:00 am
STL
-
EZE
34h 55m
2 stops
United Airlines Logo
9:00 pm - 5:42 pm
EZE
-
STL
22h 42m
1 stop
$1,342United Airlines
Sun, Jul 5 - Sun, Jul 12
United Airlines Logo
6:30 pm - 8:00 am
STL
-
EZE
35h 30m
1 stop
United Airlines Logo
9:00 pm - 2:16 pm
EZE
-
STL
19h 16m
1 stop
$1,348United Airlines
Sun, Jul 5 - Sun, Jul 12
Multiple Airlines Logo
6:30 am - 2:35 am
STL
-
EZE
18h 05m
1 stop
Multiple Airlines Logo
3:15 pm - 5:37 pm
EZE
-
STL
28h 22m
2 stops
$1,366Multiple Airlines
Wed, Jul 1 - Wed, Jul 15
LATAM Airlines Logo
10:51 am - 7:40 am
STL
-
AEP
18h 49m
2 stops
LATAM Airlines Logo
8:05 pm - 12:30 pm
AEP
-
STL
18h 25m
2 stops
$1,378LATAM Airlines
Fri, Jul 3 - Fri, Jul 10
LATAM Airlines Logo
3:57 pm - 9:45 am
STL
-
EZE
15h 48m
1 stop
LATAM Airlines Logo
12:15 pm - 9:06 am
EZE
-
STL
22h 51m
2 stops
$1,378LATAM Airlines
Fri, Jul 3 - Fri, Jul 10
United Airlines Logo
5:59 pm - 8:00 am
STL
-
EZE
36h 01m
2 stops
United Airlines Logo
9:00 pm - 3:46 pm
EZE
-
STL
20h 46m
2 stops
$1,422United Airlines
Sun, Jul 5 - Sun, Jul 12
LATAM Airlines Logo
10:51 am - 8:30 am
STL
-
AEP
19h 39m
2 stops
LATAM Airlines Logo
8:05 pm - 12:17 pm
AEP
-
STL
18h 12m
2 stops
$1,458LATAM Airlines
Wed, Jul 1 - Wed, Jul 15

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Air Canada flights from St. Louis to Buenos Aires

Our best Air Canada deals on St. Louis to Buenos Aires flight tickets
Air Canada
Jun 20
STL1:20 pmLambert-St Louis
47h 10m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Jun 24
EZE4:35 pmBuenos Aires Ministro Pistarini
21h 46m
2 stops
STL12:21 pmLambert-St Louis
$1,543
Air Canada
Jun 20
STL1:20 pmLambert-St Louis
47h 10m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Jun 24
EZE4:35 pmBuenos Aires Ministro Pistarini
53h 50m
3 stops
STL8:25 pmLambert-St Louis
$1,546
Air Canada
Jun 20
STL1:20 pmLambert-St Louis
47h 10m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Jun 24
EZE4:35 pmBuenos Aires Ministro Pistarini
29h 50m
2 stops
STL8:25 pmLambert-St Louis
$1,598

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Nov 13
STL4:17 pmLambert-St Louis
14h 03m
1 stop
EZE9:20 amBuenos Aires Ministro Pistarini
Nov 20
EZE10:05 pmBuenos Aires Ministro Pistarini
21h 30m
1 stop
STL4:35 pmLambert-St Louis
$1,228
United Airlines
Jul 5
STL5:59 pmLambert-St Louis
36h 01m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
Jul 12
EZE9:00 pmBuenos Aires Ministro Pistarini
20h 46m
2 stops
STL3:46 pmLambert-St Louis
$1,342
United Airlines
Jul 5
STL6:30 pmLambert-St Louis
35h 30m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Jul 12
EZE9:00 pmBuenos Aires Ministro Pistarini
19h 16m
1 stop
STL2:16 pmLambert-St Louis
$1,348

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 8, 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 6/17

2:15 pm-1:20 am

3 stops33h 05m

Buenos Aires Ministro Pistarini

Mon 6/22

2:30 am-12:21 pm

3 stops35h 51m

$1,188

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 6/17

2:15 pm-3:45 am

2 stops35h 30m

Buenos Aires Ministro Pistarini

Tue 6/23

7:10 am-12:21 pm

3 stops31h 11m

$1,242

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 7/5

7:12 pm-4:00 pm

2 stops18h 48m

Buenos Aires Jorge Newbery

Sun 7/12

5:35 pm-5:53 pm

2 stops26h 18m

$1,338

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 7/5

7:05 pm-8:00 am

2 stops34h 55m

Buenos Aires Ministro Pistarini

Sun 7/12

9:00 pm-5:42 pm

1 stop22h 42m

$1,342

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 7/5

6:30 pm-8:00 am

1 stop35h 30m

Buenos Aires Ministro Pistarini

Sun 7/12

9:00 pm-2:16 pm

1 stop19h 16m

$1,348

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 7/1

6:30 am-2:35 am

1 stop18h 05m

Buenos Aires Ministro Pistarini

Wed 7/15

3:15 pm-5:37 pm

2 stops28h 22m

$1,366
Quickest round-trip

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Fri 7/3

10:51 am-7:40 am

2 stops18h 49m

Buenos Aires Jorge Newbery

Fri 7/10

8:05 pm-12:30 pm

2 stops18h 25m

$1,378

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 7/3

3:57 pm-9:45 am

1 stop15h 48m

Buenos Aires Ministro Pistarini

Fri 7/10

12:15 pm-9:06 am

2 stops22h 51m

$1,378

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 7/5

5:59 pm-8:00 am

2 stops36h 01m

Buenos Aires Ministro Pistarini

Sun 7/12

9:00 pm-3:46 pm

2 stops20h 46m

$1,422

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 7/1

10:51 am-8:30 am

2 stops19h 39m

Buenos Aires Jorge Newbery

Wed 7/15

8:05 pm-12:17 pm

2 stops18h 12m

$1,458

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 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

18h 49m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 18h 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 18h 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
1,925 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,396 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