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Cheap flights from St. Louis to Buenos Aires from $505

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 5/29. 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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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
5:23 pm - 9:45 am
STL
-
EZE
14h 22m
1 stop
LATAM Airlines Logo
8:10 pm - 8:08 am
EZE
-
STL
13h 58m
1 stop
$1,139LATAM Airlines
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 - 9:54 am
EZE
-
STL
28h 19m
3 stops
$1,142LATAM Airlines
Tue, Aug 11 - Tue, Aug 18
Multiple Airlines Logo
11:15 am - 8:00 am
STL
-
EZE
18h 45m
1 stop
Multiple Airlines Logo
9:00 pm - 2:13 pm
EZE
-
STL
19h 13m
1 stop
$1,146Multiple Airlines
Tue, Aug 11 - Tue, Aug 18
LATAM Airlines Logo
12:52 pm - 9:45 am
STL
-
EZE
18h 53m
1 stop
LATAM Airlines Logo
8:10 pm - 8:08 am
EZE
-
STL
13h 58m
1 stop
$1,147LATAM Airlines
Tue, Aug 11 - Tue, Aug 18
LATAM Airlines Logo
11:00 am - 6:10 am
STL
-
EZE
17h 10m
2 stops
LATAM Airlines Logo
7:35 am - 11:46 am
EZE
-
STL
30h 11m
3 stops
$1,150LATAM Airlines
Tue, Aug 11 - Tue, Aug 18
Multiple Airlines Logo
3:07 pm - 8:00 am
STL
-
EZE
14h 53m
1 stop
Multiple Airlines Logo
9:00 pm - 2:07 pm
EZE
-
STL
19h 07m
1 stop
$1,186Multiple Airlines
Fri, Oct 2 - Wed, Oct 14
LATAM Airlines Logo
5:30 pm - 6:21 pm
STL
-
EZE
22h 51m
2 stops
LATAM Airlines Logo
8:10 pm - 8:12 am
EZE
-
STL
14h 02m
1 stop
$1,187LATAM Airlines
Fri, Oct 2 - Wed, Oct 14
LATAM Airlines Logo
5:30 pm - 6:21 pm
STL
-
EZE
22h 51m
2 stops
LATAM Airlines Logo
7:35 am - 11:37 pm
EZE
-
STL
18h 02m
2 stops
$1,219LATAM Airlines
Fri, Sep 18 - Fri, Sep 25
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
$1,220Multiple Airlines
Sat, Jun 13 - Tue, Jun 16
Delta Logo
9:21 am - 7:40 am
STL
-
AEP
20h 19m
2 stops
Delta Logo
8:05 pm - 12:34 pm
AEP
-
STL
18h 29m
2 stops
$1,297Delta
Wed, Jun 17 - Wed, Jun 24

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
STL5:23 pmLambert-St Louis
14h 22m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Aug 18
EZE8:10 pmBuenos Aires Ministro Pistarini
13h 58m
1 stop
STL8:08 amLambert-St Louis
$1,139
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
28h 19m
3 stops
STL9:54 amLambert-St Louis
$1,142
LATAM Airlines
Aug 11
STL12:52 pmLambert-St Louis
18h 53m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Aug 18
EZE8:10 pmBuenos Aires Ministro Pistarini
13h 58m
1 stop
STL8:08 amLambert-St Louis
$1,147

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Sep 18
STL3:42 pmLambert-St Louis
16h 03m
1 stop
EZE9:45 amBuenos Aires Ministro Pistarini
Sep 25
EZE8:10 pmBuenos Aires Ministro Pistarini
21h 47m
1 stop
STL3:57 pmLambert-St Louis
$1,227
Delta
Sep 18
STL1:30 pmLambert-St Louis
18h 10m
2 stops
EZE9:40 amBuenos Aires Ministro Pistarini
Sep 25
EZE1:10 pmBuenos Aires Ministro Pistarini
22h 26m
2 stops
STL9:36 amLambert-St Louis
$1,231
Delta
Jun 17
STL9:21 amLambert-St Louis
20h 19m
2 stops
AEP7:40 amBuenos Aires Jorge Newbery
Jun 24
AEP8:05 pmBuenos Aires Jorge Newbery
18h 29m
2 stops
STL12:34 pmLambert-St Louis
$1,297

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 May 22, 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

Tue 8/11

5:23 pm-9:45 am

1 stop14h 22m

Buenos Aires Ministro Pistarini

Tue 8/18

8:10 pm-8:08 am

1 stop13h 58m

$1,139

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-9:54 am

3 stops28h 19m

$1,142

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 8/11

11:15 am-8:00 am

1 stop18h 45m

Buenos Aires Ministro Pistarini

Tue 8/18

9:00 pm-2:13 pm

1 stop19h 13m

$1,146

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 8/11

12:52 pm-9:45 am

1 stop18h 53m

Buenos Aires Ministro Pistarini

Tue 8/18

8:10 pm-8:08 am

1 stop13h 58m

$1,147

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 8/11

11:00 am-6:10 am

2 stops17h 10m

Buenos Aires Ministro Pistarini

Tue 8/18

7:35 am-11:46 am

3 stops30h 11m

$1,150

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 10/2

3:07 pm-8:00 am

1 stop14h 53m

Buenos Aires Ministro Pistarini

Wed 10/14

9:00 pm-2:07 pm

1 stop19h 07m

$1,186

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 10/2

5:30 pm-6:21 pm

2 stops22h 51m

Buenos Aires Ministro Pistarini

Wed 10/14

8:10 pm-8:12 am

1 stop14h 02m

$1,187

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 9/18

5:30 pm-6:21 pm

2 stops22h 51m

Buenos Aires Ministro Pistarini

Fri 9/25

7:35 am-11:37 pm

2 stops18h 02m

$1,219

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 6/13

2:15 pm-1:20 am

3 stops33h 05m

Buenos Aires Ministro Pistarini

Tue 6/16

2:30 am-12:21 pm

3 stops35h 51m

$1,220

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Wed 6/17

9:21 am-7:40 am

2 stops20h 19m

Buenos Aires Jorge Newbery

Wed 6/24

8:05 pm-12:34 pm

2 stops18h 29m

$1,297

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 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

12h 40m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 12h 40m
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 40m 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
8,449 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