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Cheap flights from St. Louis to Buenos Aires from $992

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 3/31. 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
10:12 am - 7:40 am
STL
-
AEP
19h 28m
2 stops
LATAM Airlines Logo
3:45 pm - 9:05 am
AEP
-
STL
19h 20m
2 stops
$992LATAM Airlines
Tue, Mar 31 - Tue, Apr 7
LATAM Airlines Logo
6:59 pm - 9:45 am
STL
-
EZE
12h 46m
1 stop
LATAM Airlines Logo
4:45 pm - 11:09 am
EZE
-
STL
20h 24m
2 stops
$992LATAM Airlines
Tue, Mar 31 - Tue, Apr 7
LATAM Airlines Logo
12:04 pm - 8:35 am
STL
-
EZE
18h 31m
2 stops
LATAM Airlines Logo
3:55 am - 11:58 pm
EZE
-
STL
22h 03m
2 stops
$996LATAM Airlines
Tue, Mar 31 - Mon, Apr 6
United Airlines Logo
7:41 am - 8:20 am
STL
-
EZE
46h 39m
2 stops
United Airlines Logo
9:05 pm - 9:21 am
EZE
-
STL
14h 16m
1 stop
$1,089United Airlines
Sun, Mar 8 - Tue, Mar 17
United Airlines Logo
6:00 am - 6:20 am
STL
-
EZE
22h 20m
1 stop
United Airlines Logo
9:05 pm - 9:21 am
EZE
-
STL
14h 16m
1 stop
$1,107United Airlines
Sun, Mar 8 - Tue, Mar 17
American Airlines Logo
11:46 am - 8:00 am
STL
-
EZE
18h 14m
2 stops
American Airlines Logo
10:25 pm - 10:59 am
EZE
-
STL
14h 34m
1 stop
$1,111American Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
5:00 pm - 5:00 pm
STL
-
AEP
22h 00m
2 stops
LATAM Airlines Logo
5:05 pm - 11:09 am
AEP
-
STL
20h 04m
2 stops
$1,119LATAM Airlines
Sat, Mar 21 - Sat, Apr 4
LATAM Airlines Logo
5:00 pm - 2:55 pm
STL
-
EZE
19h 55m
2 stops
LATAM Airlines Logo
4:45 pm - 11:09 am
EZE
-
STL
20h 24m
2 stops
$1,119LATAM Airlines
Sat, Mar 21 - Sat, Apr 4
American Airlines Logo
5:15 am - 7:10 am
STL
-
EZE
23h 55m
1 stop
American Airlines Logo
8:30 pm - 10:32 am
EZE
-
STL
16h 02m
1 stop
$1,127American Airlines
Sat, Mar 21 - Sat, Apr 4
United Airlines Logo
7:41 am - 7:20 am
STL
-
EZE
44h 39m
2 stops
United Airlines Logo
9:05 pm - 9:07 pm
EZE
-
STL
26h 02m
2 stops
$1,130United Airlines
Thu, Mar 5 - Thu, Mar 12

Air Canada flights from St. Louis to Buenos Aires

Our best Air Canada deals on St. Louis to Buenos Aires flight tickets
Air Canada
Apr 30
STL4:05 pmLambert-St Louis
44h 25m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
May 4
EZE4:35 pmBuenos Aires Ministro Pistarini
29h 30m
2 stops
STL8:05 pmLambert-St Louis
$1,147
Air Canada
May 10
STL1:00 pmLambert-St Louis
23h 30m
2 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
May 16
EZE4:35 pmBuenos Aires Ministro Pistarini
45h 31m
3 stops
STL12:06 pmLambert-St Louis
$1,196
Air Canada
May 10
STL7:30 amLambert-St Louis
29h 00m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
May 16
EZE4:35 pmBuenos Aires Ministro Pistarini
45h 31m
3 stops
STL12:06 pmLambert-St Louis
$1,219

American Airlines flights from St. Louis to Buenos Aires

Our best American Airlines deals on St. Louis to Buenos Aires flight tickets
American Airlines
Mar 31
STL11:22 amLambert-St Louis
17h 53m
1 stop
EZE7:15 amBuenos Aires Ministro Pistarini
Apr 7
EZE8:25 pmBuenos Aires Ministro Pistarini
15h 51m
1 stop
STL10:16 amLambert-St Louis
$992
American Airlines
Mar 8
STL3:49 pmLambert-St Louis
16h 10m
2 stops
EZE9:59 amBuenos Aires Ministro Pistarini
Mar 17
EZE11:30 pmBuenos Aires Ministro Pistarini
18h 05m
2 stops
STL3:35 pmLambert-St Louis
$1,111
American Airlines
Mar 21
STL5:15 amLambert-St Louis
23h 55m
1 stop
EZE7:10 amBuenos Aires Ministro Pistarini
Apr 4
EZE8:30 pmBuenos Aires Ministro Pistarini
16h 02m
1 stop
STL10:32 amLambert-St Louis
$1,127

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 January 21, 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

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Tue 3/31

10:12 am-7:40 am

2 stops19h 28m

Buenos Aires Jorge Newbery

Tue 4/7

3:45 pm-9:05 am

2 stops19h 20m

$992

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/31

6:59 pm-9:45 am

1 stop12h 46m

Buenos Aires Ministro Pistarini

Tue 4/7

4:45 pm-11:09 am

2 stops20h 24m

$992

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/31

12:04 pm-8:35 am

2 stops18h 31m

Buenos Aires Ministro Pistarini

Mon 4/6

3:55 am-11:58 pm

2 stops22h 03m

$996

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:41 am-8:20 am

2 stops46h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-9:21 am

1 stop14h 16m

$1,089

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

6:00 am-6:20 am

1 stop22h 20m

Buenos Aires Ministro Pistarini

Tue 3/17

9:05 pm-9:21 am

1 stop14h 16m

$1,107

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

11:46 am-8:00 am

2 stops18h 14m

Buenos Aires Ministro Pistarini

Tue 3/17

10:25 pm-10:59 am

1 stop14h 34m

$1,111

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sat 3/21

5:00 pm-5:00 pm

2 stops22h 00m

Buenos Aires Jorge Newbery

Sat 4/4

5:05 pm-11:09 am

2 stops20h 04m

$1,119

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 3/21

5:00 pm-2:55 pm

2 stops19h 55m

Buenos Aires Ministro Pistarini

Sat 4/4

4:45 pm-11:09 am

2 stops20h 24m

$1,119

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 3/21

5:15 am-7:10 am

1 stop23h 55m

Buenos Aires Ministro Pistarini

Sat 4/4

8:30 pm-10:32 am

1 stop16h 02m

$1,127

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 3/5

7:41 am-7:20 am

2 stops44h 39m

Buenos Aires Ministro Pistarini

Thu 3/12

9:05 pm-9:07 pm

2 stops26h 02m

$1,130

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 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 $1,056, 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 October instead. Flights to Buenos Aires in October, while not as cheap as those in September, still average around $1,160.

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

  • 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
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,085 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