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Cheap flights from St. Louis to Buenos Aires from $407

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 9/5. 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

GOL Logo
4:21 pm - 12:50 pmSTL-EZE
17h 29m2 stops
GOL Logo
3:30 am - 10:32 pmEZE-STL
22h 02m2 stops
$964GOL
Find Deal
mar., nov. 18 - mar., nov. 25
GOL Logo
4:21 pm - 12:50 pmSTL-EZE
17h 29m2 stops
GOL Logo
3:30 am - 10:32 pmEZE-STL
22h 02m2 stops
$968GOL
Find Deal
mar., nov. 18 - mar., nov. 25
Delta Logo
9:10 am - 5:55 amSTL-EZE
18h 45m2 stops
Delta Logo
7:55 am - 11:41 pmEZE-STL
17h 46m2 stops
$1,016Delta
Find Deal
lun., oct. 13 - lun., oct. 27
United Airlines Logo
6:15 am - 8:00 amSTL-EZE
23h 45m1 stop
United Airlines Logo
10:55 pm - 10:39 amEZE-STL
13h 44m1 stop
$1,017United Airlines
Find Deal
lun., oct. 13 - lun., oct. 27
LATAM Airlines Logo
9:00 am - 7:55 amSTL-AEP
19h 55m2 stops
LATAM Airlines Logo
5:15 pm - 10:05 amAEP-STL
19h 50m2 stops
$1,018LATAM Airlines
Find Deal
mar., nov. 18 - mié., nov. 26
LATAM Airlines Logo
9:00 am - 6:20 amSTL-EZE
18h 20m2 stops
LATAM Airlines Logo
7:43 pm - 6:02 pmEZE-STL
25h 19m2 stops
$1,018LATAM Airlines
Find Deal
mar., nov. 18 - mié., nov. 26
Delta Logo
9:00 am - 6:20 amSTL-EZE
18h 20m2 stops
Delta Logo
8:55 pm - 10:05 amEZE-STL
16h 10m1 stop
$1,025Delta
Find Deal
mar., nov. 18 - mié., nov. 26
United Airlines Logo
6:15 am - 9:20 amSTL-EZE
24h 05m1 stop
United Airlines Logo
11:55 pm - 9:43 pmEZE-STL
24h 48m2 stops
$1,030United Airlines
Find Deal
mié., dic. 10 - mar., dic. 23
American Airlines Logo
4:35 pm - 10:15 amSTL-EZE
14h 40m1 stop
American Airlines Logo
11:20 pm - 5:48 pmEZE-STL
21h 28m1 stop
$1,163American Airlines
Find Deal
lun., dic. 8 - lun., dic. 22
American Airlines Logo
9:40 am - 7:05 amSTL-EZE
18h 25m2 stops
American Airlines Logo
11:20 pm - 5:48 pmEZE-STL
21h 28m1 stop
$1,168American Airlines
Find Deal
lun., dic. 8 - lun., dic. 22

Copa Airlines flights from St. Louis to Buenos Aires

Our best Copa Airlines deals on St. Louis to Buenos Aires flight tickets
Copa Airlines
Sep 4
STL8:15 amLambert-St Louis
21h 59m
2 stops
EZE8:14 amBuenos Aires Ministro Pistarini
Sep 12
EZE5:04 amBuenos Aires Ministro Pistarini
30h 58m
2 stops
STL10:02 amLambert-St Louis
$1,098
Find similar
Copa Airlines
Sep 4
STL8:15 amLambert-St Louis
21h 59m
2 stops
EZE8:14 amBuenos Aires Ministro Pistarini
Sep 12
EZE10:06 amBuenos Aires Ministro Pistarini
25h 56m
2 stops
STL10:02 amLambert-St Louis
$1,128
Find similar

American Airlines flights from St. Louis to Buenos Aires

Our best American Airlines deals on St. Louis to Buenos Aires flight tickets
American Airlines
Dec 8
STL4:35 pmLambert-St Louis
14h 40m
1 stop
EZE10:15 amBuenos Aires Ministro Pistarini
Dec 22
EZE11:20 pmBuenos Aires Ministro Pistarini
21h 28m
1 stop
STL5:48 pmLambert-St Louis
$1,163
Find similar
American Airlines
Dec 8
STL9:40 amLambert-St Louis
18h 25m
2 stops
EZE7:05 amBuenos Aires Ministro Pistarini
Dec 22
EZE11:20 pmBuenos Aires Ministro Pistarini
21h 28m
1 stop
STL5:48 pmLambert-St Louis
$1,168
Find similar

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 agosto 21, 2025.
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 - EZE

STLEZE

Lambert-St Louis

mar. 11/18

4:21 pm-12:50 pm

2 stops17h 29m

Buenos Aires Ministro Pistarini

mar. 11/25

3:30 am-10:32 pm

2 stops22h 02m

$964

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mar. 11/18

4:21 pm-12:50 pm

2 stops17h 29m

Buenos Aires Ministro Pistarini

mar. 11/25

3:30 am-10:32 pm

2 stops22h 02m

$968

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 10/13

9:10 am-5:55 am

2 stops18h 45m

Buenos Aires Ministro Pistarini

lun. 10/27

7:55 am-11:41 pm

2 stops17h 46m

$1,016

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 10/13

6:15 am-8:00 am

1 stop23h 45m

Buenos Aires Ministro Pistarini

lun. 10/27

10:55 pm-10:39 am

1 stop13h 44m

$1,017

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

mar. 11/18

9:00 am-7:55 am

2 stops19h 55m

Buenos Aires Jorge Newbery

mié. 11/26

5:15 pm-10:05 am

2 stops19h 50m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mar. 11/18

9:00 am-6:20 am

2 stops18h 20m

Buenos Aires Ministro Pistarini

mié. 11/26

7:43 pm-6:02 pm

2 stops25h 19m

$1,018

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mar. 11/18

9:00 am-6:20 am

2 stops18h 20m

Buenos Aires Ministro Pistarini

mié. 11/26

8:55 pm-10:05 am

1 stop16h 10m

$1,025

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mié. 12/10

6:15 am-9:20 am

1 stop24h 05m

Buenos Aires Ministro Pistarini

mar. 12/23

11:55 pm-9:43 pm

2 stops24h 48m

$1,030

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 12/8

4:35 pm-10:15 am

1 stop14h 40m

Buenos Aires Ministro Pistarini

lun. 12/22

11:20 pm-5:48 pm

1 stop21h 28m

$1,163

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 12/8

9:40 am-7:05 am

2 stops18h 25m

Buenos Aires Ministro Pistarini

lun. 12/22

11:20 pm-5:48 pm

1 stop21h 28m

$1,168

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 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 June. Flight prices, which tend to average around $1,053, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of June, then book flights to Buenos Aires from St. Louis during September instead. Flights to Buenos Aires in September, while not as cheap as those in June, still average around $1,144.

What is the cheapest day to depart on your flight to Buenos Aires?

On average, the least expensive day to fly to Buenos Aires from St. Louis is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $1,163. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to Buenos Aires on Friday is $1,386.

What is the cheapest time of day to depart on your flight to Buenos Aires?

Our most recent data shows that the best time of day to fly to Buenos Aires is in the evening. Flights from St. Louis to Buenos Aires during this time can be as low as $1,153. Try not to purchase tickets in the morning because they tend to be around $1,368. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

Direct flights

None
There are no direct flights from St. Louis to Buenos Aires. There are no popular flight routes from St. Louis to Buenos Aires.
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  • 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 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 $1,023Free CancellationRating
7.9
7,981 reviews
Search Delta flights
American AirlinesPriceFrom $1,025Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $1,053Free CancellationRating
7.4
8,930 reviews
Search United Airlines 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