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Cheap flights from Buenos Aires to St. Louis from $421

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Buenos Aires to St. Louis departing on 9/19. 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

Find the cheapest flights from Buenos Aires to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
10:30 pm - 10:45 amEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
14h 15m1 stop Miami
American Airlines Logo
11:35 am - 8:45 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
19h 10m1 stop Miami
$1,051American Airlines
Thu, Aug 20 - Thu, Aug 27
American Airlines Logo
8:50 pm - 10:45 amEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
15h 55m1 stop Miami
American Airlines Logo
10:22 am - 8:45 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
20h 23m2 stops Charlotte Douglas Miami
$1,055American Airlines
Thu, Aug 20 - Thu, Aug 27
American Airlines Logo
11:35 pm - 5:27 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
19h 52m2 stops Miami Washington, D.C. Reagan-National
American Airlines Logo
12:45 pm - 8:45 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
18h 00m2 stops Dallas/Fort Worth Miami
$1,055American Airlines
Thu, Aug 20 - Thu, Aug 27
LATAM Airlines Logo
11:35 pm - 11:39 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
27h 04m1 stop Atlanta Hartsfield-Jackson
LATAM Airlines Logo
9:00 am - 9:40 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
21h 40m1 stop Atlanta Hartsfield-Jackson
$1,179LATAM Airlines
Thu, Jan 21 - Mon, Mar 8
Delta Logo
11:35 pm - 11:39 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
27h 04m1 stop Atlanta Hartsfield-Jackson
Delta Logo
10:45 am - 9:40 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
19h 55m2 stops Detroit Metropolitan Wayne County Miami
$1,197Delta
Thu, Jan 21 - Mon, Mar 8
Delta Logo
8:10 pm - 3:54 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
21h 44m1 stop Atlanta Hartsfield-Jackson
Delta Logo
1:01 pm - 9:40 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
18h 39m2 stops New York LaGuardia Miami
$1,197Delta
Tue, Sep 15 - Tue, Sep 22
American Airlines Logo
10:30 pm - 10:45 amEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
14h 15m1 stop Miami
American Airlines Logo
2:11 pm - 8:30 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
16h 19m1 stop Miami
$1,197American Airlines
Sun, Aug 23 - Sun, Sep 13
LATAM Airlines Logo
3:55 am - 11:42 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
21h 47m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson
LATAM Airlines Logo
2:30 pm - 11:30 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
19h 00m2 stops Atlanta Hartsfield-Jackson Santiago Arturo Merino Benitez
$1,206LATAM Airlines
Mon, Sep 14 - Tue, Sep 22
LATAM Airlines Logo
7:20 am - 11:39 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
19h 19m2 stops Lima J Chavez Intl Atlanta Hartsfield-Jackson
LATAM Airlines Logo
9:00 am - 6:20 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
18h 20m2 stops Atlanta Hartsfield-Jackson Lima J Chavez Intl
$1,209LATAM Airlines
Thu, Jan 21 - Mon, Mar 8
Delta Logo
8:10 pm - 1:23 pmEZE  Buenos Aires Ministro Pistarini-STL Lambert-St Louis
19h 13m1 stop Atlanta Hartsfield-Jackson
Delta Logo
6:45 pm - 9:45 amSTL  Lambert-St Louis-EZE Buenos Aires Ministro Pistarini
13h 00m1 stop Atlanta Hartsfield-Jackson
$1,260Delta
Tue, Sep 15 - Tue, Sep 22

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LATAM Airlines flights from Buenos Aires to St. Louis

Our best LATAM Airlines deals on Buenos Aires to St. Louis flight tickets
LATAM Airlines
Jan 21
EZE11:35 pmBuenos Aires Ministro Pistarini
27h 04m
1 stop
STL11:39 pmLambert-St Louis
Mar 8
STL9:00 amLambert-St Louis
21h 40m
1 stop
EZE9:40 amBuenos Aires Ministro Pistarini
$1,179
LATAM Airlines
Aug 24
EZE8:10 pmBuenos Aires Ministro Pistarini
24h 17m
1 stop
STL6:27 pmLambert-St Louis
Sep 21
STL10:05 amLambert-St Louis
23h 25m
2 stops
EZE11:30 amBuenos Aires Ministro Pistarini
$1,196
LATAM Airlines
Sep 14
EZE3:55 amBuenos Aires Ministro Pistarini
21h 47m
2 stops
STL11:42 pmLambert-St Louis
Sep 22
STL2:30 pmLambert-St Louis
19h 00m
2 stops
EZE11:30 amBuenos Aires Ministro Pistarini
$1,206

United Airlines flights from Buenos Aires to St. Louis

Our best United Airlines deals on Buenos Aires to St. Louis flight tickets
United Airlines
Aug 25
EZE9:00 pmBuenos Aires Ministro Pistarini
19h 13m
1 stop
STL2:13 pmLambert-St Louis
Sep 22
STL11:15 amLambert-St Louis
18h 45m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
$1,160
United Airlines
Aug 21
EZE9:00 pmBuenos Aires Ministro Pistarini
20h 31m
2 stops
STL3:31 pmLambert-St Louis
Sep 22
STL8:00 amLambert-St Louis
22h 00m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
$1,242
United Airlines
Aug 22
EZE9:00 pmBuenos Aires Ministro Pistarini
27h 27m
1 stop
STL10:27 pmLambert-St Louis
Sep 22
STL11:15 amLambert-St Louis
18h 45m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
$1,372

momondo Fare Finder

 
Customize your flight search to find flights from Buenos Aires to St. Louis 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 August 6, 2026.
Use the filters below to find and compare flights from Buenos Aires to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Thu 8/20

10:30 pm-10:45 am

1 stop14h 15m

Lambert-St Louis

Thu 8/27

11:35 am-8:45 am

1 stop19h 10m

$1,051

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Thu 8/20

8:50 pm-10:45 am

1 stop15h 55m

Lambert-St Louis

Thu 8/27

10:22 am-8:45 am

2 stops20h 23m

$1,055

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Thu 8/20

11:35 pm-5:27 pm

2 stops19h 52m

Lambert-St Louis

Thu 8/27

12:45 pm-8:45 am

2 stops18h 00m

$1,055

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Thu 1/21

11:35 pm-11:39 pm

1 stop27h 04m

Lambert-St Louis

Mon 3/8

9:00 am-9:40 am

1 stop21h 40m

$1,179

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Thu 1/21

11:35 pm-11:39 pm

1 stop27h 04m

Lambert-St Louis

Mon 3/8

10:45 am-9:40 am

2 stops19h 55m

$1,197

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Tue 9/15

8:10 pm-3:54 pm

1 stop21h 44m

Lambert-St Louis

Tue 9/22

1:01 pm-9:40 am

2 stops18h 39m

$1,197
Quickest round-trip

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Sun 8/23

10:30 pm-10:45 am

1 stop14h 15m

Lambert-St Louis

Sun 9/13

2:11 pm-8:30 am

1 stop16h 19m

$1,197

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Mon 9/14

3:55 am-11:42 pm

2 stops21h 47m

Lambert-St Louis

Tue 9/22

2:30 pm-11:30 am

2 stops19h 00m

$1,206

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Thu 1/21

7:20 am-11:39 pm

2 stops19h 19m

Lambert-St Louis

Mon 3/8

9:00 am-6:20 am

2 stops18h 20m

$1,209

Buenos AiresSt. Louis

EZE Buenos Aires Ministro Pistarini - STL Lambert-St Louis

EZESTL

Buenos Aires Ministro Pistarini

Tue 9/15

8:10 pm-1:23 pm

1 stop19h 13m

Lambert-St Louis

Tue 9/22

6:45 pm-9:45 am

1 stop13h 00m

$1,260

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Buenos Aires to St. Louis

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Can stopping save me money on Buenos Aires to St. Louis flights?

You could potentially save up to 20% on your flight if you consider stops on a Buenos Aires to St. Louis flight.

When to book flights from Buenos Aires to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Buenos Aires to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Buenos Aires to St. Louis (BUE to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Buenos Aires to St. Louis

Fastest flight time

20h 23m

Direct flights

None
The fastest flight from Buenos Aires to St. Louis takes 20h 23m
There are no direct flights from Buenos Aires to St. Louis. There are no popular flight routes from Buenos Aires to St. Louis.
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Frequently asked questions about flying from Buenos Aires to St. Louis

  • How far is Buenos Aires to Lambert-St Louis by plane?

    Buenos Aires and Lambert-St Louis are 5450.9 mi apart from one another. Flights usually cover this in 20h 23m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Buenos Aires to Lambert-St Louis Airport?

    Prices for flights from Buenos Aires to Lambert-St Louis Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Buenos Aires to Lambert-St Louis Airport?

    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 Buenos Aires to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
St. Peters
Maryland Heights
Florissant
Collinsville
Alton
O'Fallon
Clayton
Farmington
Fenton
Wentzville
Festus
Eureka
Edwardsville
Litchfield
Grafton
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Buenos Aires to St. Louis?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Buenos Aires to St. Louis. momondo saves you time and could save you money on your trip.

Can I find flights from Buenos Aires to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis from Buenos Aires which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Buenos Aires to St. Louis?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Buenos Aires to St. Louis.

I’m not ready to book a flight from Buenos Aires to St. Louis right now. Can momondo alert me if prices change?

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