Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Buenos Aires from $957

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 3/8. 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
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from St. Louis to Buenos Aires

Cheap round-trip flights

Enter your travel dates to find the best prices.
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
$957United Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
7:03 am - 7:20 am
STL
-
EZE
22h 17m
1 stop
LATAM Airlines Logo
8:55 pm - 9:05 am
EZE
-
STL
14h 10m
1 stop
$1,024LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
4:21 pm - 9:00 am
STL
-
EZE
14h 39m
1 stop
LATAM Airlines Logo
2:45 pm - 9:05 am
EZE
-
STL
20h 20m
2 stops
$1,032LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
Multiple Airlines Logo
6:00 am - 10:15 am
STL
-
EZE
26h 15m
2 stops
Multiple Airlines Logo
11:00 am - 11:09 am
EZE
-
STL
26h 09m
2 stops
$1,036Multiple Airlines
Sun, Mar 8 - Tue, Mar 17
American Airlines Logo
11:46 am - 8:20 am
STL
-
EZE
17h 34m
1 stop
American Airlines Logo
10:25 pm - 5:13 pm
EZE
-
STL
20h 48m
1 stop
$1,067American Airlines
Mon, Mar 2 - Wed, Mar 11
United Airlines Logo
1:11 pm - 9:20 am
STL
-
EZE
17h 09m
2 stops
United Airlines Logo
9:05 pm - 9:07 pm
EZE
-
STL
26h 02m
2 stops
$1,071United Airlines
Tue, Mar 3 - Tue, Mar 10
LATAM Airlines Logo
12:04 pm - 7:55 am
STL
-
AEP
17h 51m
2 stops
LATAM Airlines Logo
5:15 pm - 11:09 am
AEP
-
STL
19h 54m
2 stops
$1,079LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
United Airlines Logo
7:41 am - 7:20 am
STL
-
EZE
20h 39m
2 stops
United Airlines Logo
9:05 pm - 2:43 pm
EZE
-
STL
43h 38m
2 stops
$1,087United Airlines
Mon, Mar 2 - Wed, Mar 11
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
Multiple Airlines Logo
4:05 pm - 1:40 pm
STL
-
AEP
18h 35m
2 stops
Multiple Airlines Logo
3:20 pm - 3:29 pm
AEP
-
STL
27h 09m
2 stops
$4,014Multiple Airlines
Mon, Feb 2 - Thu, Feb 19

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
Apr 25
STL2:40 pmLambert-St Louis
45h 50m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Apr 30
EZE4:30 pmBuenos Aires Ministro Pistarini
53h 35m
3 stops
STL8:05 pmLambert-St Louis
$1,679
Air Canada
Mar 20
STL7:41 amLambert-St Louis
29h 29m
3 stops
EZE3:10 pmBuenos Aires Ministro Pistarini
Apr 4
EZE4:30 pmBuenos Aires Ministro Pistarini
24h 54m
2 stops
STL3:24 pmLambert-St Louis
$1,847

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 2
STL11:46 amLambert-St Louis
17h 34m
1 stop
EZE8:20 amBuenos Aires Ministro Pistarini
Mar 11
EZE10:25 pmBuenos Aires Ministro Pistarini
20h 48m
1 stop
STL5:13 pmLambert-St Louis
$1,067
American Airlines
Mar 8
STL11:46 amLambert-St Louis
18h 14m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
Mar 17
EZE10:25 pmBuenos Aires Ministro Pistarini
14h 34m
1 stop
STL10:59 amLambert-St Louis
$1,111
American Airlines
Mar 21
STL6:20 pmLambert-St Louis
13h 39m
1 stop
EZE9:59 amBuenos Aires Ministro Pistarini
Apr 4
EZE10:20 pmBuenos Aires Ministro Pistarini
21h 20m
1 stop
STL5:40 pmLambert-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 19, 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 - 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

$957

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

7:03 am-7:20 am

1 stop22h 17m

Buenos Aires Ministro Pistarini

Tue 3/17

8:55 pm-9:05 am

1 stop14h 10m

$1,024

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

4:21 pm-9:00 am

1 stop14h 39m

Buenos Aires Ministro Pistarini

Tue 3/17

2:45 pm-9:05 am

2 stops20h 20m

$1,032

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 3/8

6:00 am-10:15 am

2 stops26h 15m

Buenos Aires Ministro Pistarini

Tue 3/17

11:00 am-11:09 am

2 stops26h 09m

$1,036

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/2

11:46 am-8:20 am

1 stop17h 34m

Buenos Aires Ministro Pistarini

Wed 3/11

10:25 pm-5:13 pm

1 stop20h 48m

$1,067

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 3/3

1:11 pm-9:20 am

2 stops17h 09m

Buenos Aires Ministro Pistarini

Tue 3/10

9:05 pm-9:07 pm

2 stops26h 02m

$1,071

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

12:04 pm-7:55 am

2 stops17h 51m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-11:09 am

2 stops19h 54m

$1,079

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 3/2

7:41 am-7:20 am

2 stops20h 39m

Buenos Aires Ministro Pistarini

Wed 3/11

9:05 pm-2:43 pm

2 stops43h 38m

$1,087

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

Mon 2/2

4:05 pm-1:40 pm

2 stops18h 35m

Buenos Aires Jorge Newbery

Thu 2/19

3:20 pm-3:29 pm

2 stops27h 09m

$4,014

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
1
2

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

14h 45m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 14h 45m
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 14h 45m 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
8,076 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.

An easier way to manage your Buenos Aires trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 2/18
Wed 2/25
By creating a price alert you accept our terms of use and privacy policy.

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