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Cheap flights from St. Louis to Buenos Aires from $391

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 11/3. 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

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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
11:00 am - 9:45 am
STL
-
EZE
20h 45m
1 stop
LATAM Airlines Logo
8:10 pm - 9:54 am
EZE
-
STL
15h 44m
1 stop
$1,132LATAM Airlines
Thu, Aug 13 - Wed, Aug 26
LATAM Airlines Logo
6:00 am - 9:40 am
STL
-
EZE
25h 40m
2 stops
LATAM Airlines Logo
3:55 am - 11:58 pm
EZE
-
STL
22h 03m
2 stops
$1,146LATAM Airlines
Mon, Aug 17 - Sun, Aug 23
Delta Logo
4:13 pm - 4:00 pm
STL
-
AEP
20h 47m
2 stops
Delta Logo
5:35 pm - 10:48 am
AEP
-
STL
20h 13m
2 stops
$1,148Delta
Mon, Nov 16 - Mon, Nov 23
Delta Logo
9:00 am - 6:20 am
STL
-
EZE
18h 20m
2 stops
Delta Logo
9:30 pm - 6:01 pm
EZE
-
STL
23h 31m
1 stop
$1,148Delta
Mon, Nov 16 - Mon, Nov 23
Delta Logo
11:00 am - 9:40 am
STL
-
EZE
20h 40m
2 stops
Delta Logo
8:10 pm - 11:46 am
EZE
-
STL
17h 36m
1 stop
$1,152Delta
Thu, Aug 13 - Wed, Aug 26
United Airlines Logo
5:55 pm - 7:20 am
STL
-
EZE
34h 25m
1 stop
United Airlines Logo
11:55 pm - 4:39 pm
EZE
-
STL
19h 44m
1 stop
$1,157United Airlines
Sun, Nov 15 - Tue, Nov 24
United Airlines Logo
5:55 pm - 7:20 am
STL
-
EZE
34h 25m
1 stop
United Airlines Logo
11:55 pm - 3:41 pm
EZE
-
STL
18h 46m
2 stops
$1,162United Airlines
Sun, Nov 15 - Tue, Nov 24
LATAM Airlines Logo
10:51 am - 9:40 am
STL
-
EZE
20h 49m
2 stops
LATAM Airlines Logo
1:10 pm - 9:43 am
EZE
-
STL
22h 33m
2 stops
$1,175LATAM Airlines
Thu, Jul 16 - Thu, Jul 30
Multiple Airlines Logo
8:55 am - 9:00 pm
STL
-
AEP
34h 05m
2 stops
Multiple Airlines Logo
7:00 am - 2:02 pm
AEP
-
STL
33h 02m
3 stops
$1,545Multiple Airlines
Mon, Aug 17 - Mon, Aug 24
Multiple Airlines Logo
12:10 pm - 9:00 pm
STL
-
AEP
30h 50m
3 stops
Multiple Airlines Logo
7:00 am - 2:02 pm
AEP
-
STL
33h 02m
3 stops
$1,549Multiple Airlines
Mon, Aug 17 - Mon, Aug 24

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United Airlines flights from St. Louis to Buenos Aires

Our best United Airlines deals on St. Louis to Buenos Aires flight tickets
United Airlines
Nov 15
STL5:55 pmLambert-St Louis
34h 25m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Nov 24
EZE11:55 pmBuenos Aires Ministro Pistarini
19h 44m
1 stop
STL4:39 pmLambert-St Louis
$1,157
United Airlines
Nov 15
STL5:55 pmLambert-St Louis
34h 25m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Nov 23
EZE10:05 pmBuenos Aires Ministro Pistarini
19h 25m
2 stops
STL2:30 pmLambert-St Louis
$1,162
United Airlines
Nov 18
STL1:08 pmLambert-St Louis
17h 12m
2 stops
EZE9:20 amBuenos Aires Ministro Pistarini
Nov 24
EZE11:55 pmBuenos Aires Ministro Pistarini
17h 18m
1 stop
STL2:13 pmLambert-St Louis
$1,178

American Airlines flights from St. Louis to Buenos Aires

Our best American Airlines deals on St. Louis to Buenos Aires flight tickets
American Airlines
Jun 28
STL5:16 amLambert-St Louis
12h 59m
1 stop
EZE8:15 pmBuenos Aires Ministro Pistarini
Jul 5
EZE10:00 pmBuenos Aires Ministro Pistarini
23h 53m
1 stop
STL7:53 pmLambert-St Louis
$1,178
American Airlines
Jun 28
STL1:42 pmLambert-St Louis
17h 08m
2 stops
EZE8:50 amBuenos Aires Ministro Pistarini
Jul 5
EZE8:30 pmBuenos Aires Ministro Pistarini
17h 25m
2 stops
STL11:55 amLambert-St Louis
$1,182
American Airlines
Aug 15
STL11:35 amLambert-St Louis
19h 10m
1 stop
EZE8:45 amBuenos Aires Ministro Pistarini
Aug 31
EZE8:50 pmBuenos Aires Ministro Pistarini
15h 55m
1 stop
STL10:45 amLambert-St Louis
$1,188

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 June 24, 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
Quickest round-trip

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 8/13

11:00 am-9:45 am

1 stop20h 45m

Buenos Aires Ministro Pistarini

Wed 8/26

8:10 pm-9:54 am

1 stop15h 44m

$1,132

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 8/17

6:00 am-9:40 am

2 stops25h 40m

Buenos Aires Ministro Pistarini

Sun 8/23

3:55 am-11:58 pm

2 stops22h 03m

$1,146

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Mon 11/16

4:13 pm-4:00 pm

2 stops20h 47m

Buenos Aires Jorge Newbery

Mon 11/23

5:35 pm-10:48 am

2 stops20h 13m

$1,148

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Mon 11/16

9:00 am-6:20 am

2 stops18h 20m

Buenos Aires Ministro Pistarini

Mon 11/23

9:30 pm-6:01 pm

1 stop23h 31m

$1,148

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 8/13

11:00 am-9:40 am

2 stops20h 40m

Buenos Aires Ministro Pistarini

Wed 8/26

8:10 pm-11:46 am

1 stop17h 36m

$1,152

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 11/15

5:55 pm-7:20 am

1 stop34h 25m

Buenos Aires Ministro Pistarini

Tue 11/24

11:55 pm-4:39 pm

1 stop19h 44m

$1,157

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sun 11/15

5:55 pm-7:20 am

1 stop34h 25m

Buenos Aires Ministro Pistarini

Tue 11/24

11:55 pm-3:41 pm

2 stops18h 46m

$1,162

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 7/16

10:51 am-9:40 am

2 stops20h 49m

Buenos Aires Ministro Pistarini

Thu 7/30

1:10 pm-9:43 am

2 stops22h 33m

$1,175

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Mon 8/17

8:55 am-9:00 pm

2 stops34h 05m

Buenos Aires Jorge Newbery

Mon 8/24

7:00 am-2:02 pm

3 stops33h 02m

$1,545

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Mon 8/17

12:10 pm-9:00 pm

3 stops30h 50m

Buenos Aires Jorge Newbery

Mon 8/24

7:00 am-2:02 pm

3 stops33h 02m

$1,549

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 October. Flight prices, which tend to average around $829, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Buenos Aires from St. Louis during February instead. Flights to Buenos Aires in February, while not as cheap as those in October, still average around $884.

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

16h 59m

Direct flights

None
The fastest flight from St. Louis to Buenos Aires takes 16h 59m
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

Frequently asked questions about flying from St. Louis to Buenos Aires

  • 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 16h 59m 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
1,942 reviews
Search LATAM Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.8
8,432 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