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Cheap flights from St. Louis to Buenos Aires from $464

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 10/18. 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.
GOL Logo
4:21 pm - 12:20 pm
STL
-
EZE
16h 59m
2 stops
GOL Logo
3:15 am - 10:32 pm
EZE
-
STL
22h 17m
2 stops
$1,099GOL
Tue, Nov 10 - Sat, Nov 21
Delta Logo
9:24 am - 9:45 am
STL
-
EZE
22h 21m
1 stop
Delta Logo
8:10 pm - 6:27 pm
EZE
-
STL
24h 17m
1 stop
$1,142Delta
Mon, Jul 20 - Mon, Aug 3
Copa Airlines Logo
3:13 pm - 8:00 am
STL
-
EZE
14h 47m
1 stop
Copa Airlines Logo
9:00 pm - 2:07 pm
EZE
-
STL
19h 07m
1 stop
$1,147Copa Airlines
Tue, Sep 8 - Tue, Oct 20
Delta Logo
9:17 am - 6:10 am
STL
-
EZE
18h 53m
2 stops
Delta Logo
8:10 pm - 9:54 am
EZE
-
STL
15h 44m
1 stop
$1,148Delta
Tue, Aug 11 - Tue, Aug 18
LATAM Airlines Logo
6:00 am - 6:10 am
STL
-
EZE
22h 10m
2 stops
LATAM Airlines Logo
7:35 am - 6:27 pm
EZE
-
STL
36h 52m
3 stops
$1,151LATAM Airlines
Tue, Aug 11 - Tue, Aug 18
United Airlines Logo
6:15 am - 8:00 am
STL
-
EZE
23h 45m
1 stop
United Airlines Logo
9:00 pm - 10:30 pm
EZE
-
STL
27h 30m
1 stop
$1,157United Airlines
Thu, Oct 15 - Thu, Oct 22
LATAM Airlines Logo
9:00 am - 7:40 am
STL
-
AEP
19h 40m
2 stops
LATAM Airlines Logo
5:05 pm - 5:06 pm
AEP
-
STL
27h 01m
2 stops
$1,179LATAM Airlines
Tue, Nov 10 - Sun, Nov 22
LATAM Airlines Logo
9:00 am - 6:20 am
STL
-
EZE
18h 20m
2 stops
LATAM Airlines Logo
9:30 pm - 10:48 am
EZE
-
STL
16h 18m
1 stop
$1,188LATAM Airlines
Tue, Nov 10 - Sun, Nov 22
American Airlines Logo
1:14 pm - 8:50 am
STL
-
EZE
17h 36m
2 stops
American Airlines Logo
8:30 pm - 12:00 pm
EZE
-
STL
17h 30m
2 stops
$1,193American Airlines
Mon, Jul 20 - Mon, Aug 3
United Airlines Logo
4:17 pm - 7:20 am
STL
-
EZE
36h 03m
1 stop
United Airlines Logo
10:05 pm - 9:42 am
EZE
-
STL
14h 37m
1 stop
$1,197United Airlines
Tue, Nov 10 - Sun, Nov 22

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Oct 15
STL6:15 amLambert-St Louis
23h 45m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Oct 22
EZE9:00 pmBuenos Aires Ministro Pistarini
27h 30m
1 stop
STL10:30 pmLambert-St Louis
$1,157
United Airlines
Nov 10
STL4:17 pmLambert-St Louis
36h 03m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Nov 22
EZE10:05 pmBuenos Aires Ministro Pistarini
14h 37m
1 stop
STL9:42 amLambert-St Louis
$1,197
United Airlines
Jul 20
STL2:57 pmLambert-St Louis
15h 03m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
Jul 30
EZE9:00 pmBuenos Aires Ministro Pistarini
19h 16m
1 stop
STL2:16 pmLambert-St Louis
$1,223

LATAM Airlines flights from St. Louis to Buenos Aires

Our best LATAM Airlines deals on St. Louis to Buenos Aires flight tickets
LATAM Airlines
Aug 11
STL6:00 amLambert-St Louis
22h 10m
2 stops
EZE6:10 amBuenos Aires Ministro Pistarini
Aug 18
EZE7:35 amBuenos Aires Ministro Pistarini
36h 52m
3 stops
STL6:27 pmLambert-St Louis
$1,151
LATAM Airlines
Nov 10
STL9:00 amLambert-St Louis
19h 40m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Nov 22
AEP5:05 pmBuenos Aires Jorge Newbery
27h 01m
2 stops
STL5:06 pmLambert-St Louis
$1,179
LATAM Airlines
Nov 10
STL9:00 amLambert-St Louis
18h 20m
2 stops
EZE6:20 amBuenos Aires Ministro Pistarini
Nov 22
EZE9:30 pmBuenos Aires Ministro Pistarini
16h 18m
1 stop
STL10:48 amLambert-St Louis
$1,188

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 4, 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

Tue 11/10

4:21 pm-12:20 pm

2 stops16h 59m

Buenos Aires Ministro Pistarini

Sat 11/21

3:15 am-10:32 pm

2 stops22h 17m

$1,099

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 7/20

9:24 am-9:45 am

1 stop22h 21m

Buenos Aires Ministro Pistarini

Mon 8/3

8:10 pm-6:27 pm

1 stop24h 17m

$1,142
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 9/8

3:13 pm-8:00 am

1 stop14h 47m

Buenos Aires Ministro Pistarini

Tue 10/20

9:00 pm-2:07 pm

1 stop19h 07m

$1,147

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 8/11

9:17 am-6:10 am

2 stops18h 53m

Buenos Aires Ministro Pistarini

Tue 8/18

8:10 pm-9:54 am

1 stop15h 44m

$1,148

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 8/11

6:00 am-6:10 am

2 stops22h 10m

Buenos Aires Ministro Pistarini

Tue 8/18

7:35 am-6:27 pm

3 stops36h 52m

$1,151

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 10/15

6:15 am-8:00 am

1 stop23h 45m

Buenos Aires Ministro Pistarini

Thu 10/22

9:00 pm-10:30 pm

1 stop27h 30m

$1,157

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 11/10

9:00 am-7:40 am

2 stops19h 40m

Buenos Aires Jorge Newbery

Sun 11/22

5:05 pm-5:06 pm

2 stops27h 01m

$1,179

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/10

9:00 am-6:20 am

2 stops18h 20m

Buenos Aires Ministro Pistarini

Sun 11/22

9:30 pm-10:48 am

1 stop16h 18m

$1,188

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 7/20

1:14 pm-8:50 am

2 stops17h 36m

Buenos Aires Ministro Pistarini

Mon 8/3

8:30 pm-12:00 pm

2 stops17h 30m

$1,193

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/10

4:17 pm-7:20 am

1 stop36h 03m

Buenos Aires Ministro Pistarini

Sun 11/22

10:05 pm-9:42 am

1 stop14h 37m

$1,197

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 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

14h 47m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 14h 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 14h 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
1,919 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,402 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