Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Buenos Aires from $418

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 4/19. 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
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.
LATAM Airlines Logo
5:45 pm - 9:20 am
STL
-
EZE
37h 35m
2 stops
LATAM Airlines Logo
7:35 am - 11:38 pm
EZE
-
STL
18h 03m
2 stops
$1,044LATAM Airlines
Sun, Jun 14 - Tue, Jun 23
United Airlines Logo
8:15 pm - 8:00 am
STL
-
EZE
33h 45m
2 stops
United Airlines Logo
9:00 pm - 5:42 pm
EZE
-
STL
22h 42m
1 stop
$1,061United Airlines
Sun, Jun 14 - Tue, Jun 23
United Airlines Logo
6:30 pm - 8:00 am
STL
-
EZE
35h 30m
1 stop
United Airlines Logo
9:00 pm - 5:42 pm
EZE
-
STL
22h 42m
1 stop
$1,066United Airlines
Sun, Jun 14 - Tue, Jun 23
LATAM Airlines Logo
11:51 am - 9:45 am
STL
-
EZE
19h 54m
1 stop
LATAM Airlines Logo
12:15 pm - 6:02 pm
EZE
-
STL
31h 47m
2 stops
$1,083LATAM Airlines
Thu, Jun 18 - Thu, Jun 25
LATAM Airlines Logo
7:05 pm - 2:45 am
STL
-
EZE
29h 40m
2 stops
LATAM Airlines Logo
12:15 pm - 6:02 pm
EZE
-
STL
31h 47m
2 stops
$1,088LATAM Airlines
Thu, Jun 18 - Thu, Jun 25
LATAM Airlines Logo
5:30 pm - 4:00 pm
STL
-
AEP
20h 30m
2 stops
LATAM Airlines Logo
3:45 pm - 10:45 am
AEP
-
STL
21h 00m
2 stops
$1,144LATAM Airlines
Thu, Jun 18 - Thu, Jun 25
Air Canada Logo
1:05 pm - 2:30 pm
STL
-
EZE
47h 25m
3 stops
Air Canada Logo
4:35 pm - 8:25 pm
EZE
-
STL
53h 50m
3 stops
$1,145Air Canada
Tue, May 26 - Wed, Jun 3
United Airlines Logo
8:35 am - 8:00 am
STL
-
EZE
21h 25m
1 stop
United Airlines Logo
9:00 pm - 10:09 am
EZE
-
STL
15h 09m
1 stop
$1,147United Airlines
Mon, Aug 24 - Mon, Aug 31
American Airlines Logo
11:48 am - 8:50 am
STL
-
EZE
19h 02m
1 stop
American Airlines Logo
10:20 pm - 3:27 pm
EZE
-
STL
19h 07m
2 stops
$1,150American Airlines
Tue, Sep 1 - Wed, Sep 23
United Airlines Logo
5:33 pm - 8:00 am
STL
-
EZE
36h 27m
2 stops
United Airlines Logo
9:00 pm - 3:38 pm
EZE
-
STL
20h 38m
2 stops
$1,151United Airlines
Wed, Aug 5 - Wed, Aug 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
May 26
STL1:05 pmLambert-St Louis
47h 25m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
Jun 3
EZE4:35 pmBuenos Aires Ministro Pistarini
53h 50m
3 stops
STL8:25 pmLambert-St Louis
$1,145
Air Canada
May 4
STL1:05 pmLambert-St Louis
47h 25m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
May 11
EZE4:35 pmBuenos Aires Ministro Pistarini
53h 50m
3 stops
STL8:25 pmLambert-St Louis
$1,170
Air Canada
May 4
STL1:05 pmLambert-St Louis
47h 25m
3 stops
EZE2:30 pmBuenos Aires Ministro Pistarini
May 18
EZE4:35 pmBuenos Aires Ministro Pistarini
53h 50m
3 stops
STL8:25 pmLambert-St Louis
$1,177

United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
May 4
STL10:14 amLambert-St Louis
19h 46m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
May 12
EZE9:00 pmBuenos Aires Ministro Pistarini
14h 30m
1 stop
STL9:30 amLambert-St Louis
$1,222
United Airlines
May 4
STL1:24 pmLambert-St Louis
16h 36m
2 stops
EZE8:00 amBuenos Aires Ministro Pistarini
May 12
EZE9:00 pmBuenos Aires Ministro Pistarini
21h 01m
1 stop
STL4:01 pmLambert-St Louis
$1,226
United Airlines
Apr 30
STL10:14 amLambert-St Louis
19h 46m
1 stop
EZE8:00 amBuenos Aires Ministro Pistarini
May 7
EZE9:00 pmBuenos Aires Ministro Pistarini
14h 30m
1 stop
STL9:30 amLambert-St Louis
$1,272

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 March 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

Cheapest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 6/14

5:45 pm-9:20 am

2 stops37h 35m

Buenos Aires Ministro Pistarini

Tue 6/23

7:35 am-11:38 pm

2 stops18h 03m

$1,044

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 6/14

8:15 pm-8:00 am

2 stops33h 45m

Buenos Aires Ministro Pistarini

Tue 6/23

9:00 pm-5:42 pm

1 stop22h 42m

$1,061

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 6/14

6:30 pm-8:00 am

1 stop35h 30m

Buenos Aires Ministro Pistarini

Tue 6/23

9:00 pm-5:42 pm

1 stop22h 42m

$1,066

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 6/18

11:51 am-9:45 am

1 stop19h 54m

Buenos Aires Ministro Pistarini

Thu 6/25

12:15 pm-6:02 pm

2 stops31h 47m

$1,083

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 6/18

7:05 pm-2:45 am

2 stops29h 40m

Buenos Aires Ministro Pistarini

Thu 6/25

12:15 pm-6:02 pm

2 stops31h 47m

$1,088

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 6/18

5:30 pm-4:00 pm

2 stops20h 30m

Buenos Aires Jorge Newbery

Thu 6/25

3:45 pm-10:45 am

2 stops21h 00m

$1,144

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 5/26

1:05 pm-2:30 pm

3 stops47h 25m

Buenos Aires Ministro Pistarini

Wed 6/3

4:35 pm-8:25 pm

3 stops53h 50m

$1,145
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 8/24

8:35 am-8:00 am

1 stop21h 25m

Buenos Aires Ministro Pistarini

Mon 8/31

9:00 pm-10:09 am

1 stop15h 09m

$1,147

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 9/1

11:48 am-8:50 am

1 stop19h 02m

Buenos Aires Ministro Pistarini

Wed 9/23

10:20 pm-3:27 pm

2 stops19h 07m

$1,150

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Wed 8/5

5:33 pm-8:00 am

2 stops36h 27m

Buenos Aires Ministro Pistarini

Wed 8/12

9:00 pm-3:38 pm

2 stops20h 38m

$1,151

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 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 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 15m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 14h 15m
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 15m 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
1,917 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,312 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
Mon 4/20
Mon 4/27
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