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Cheap flights from St. Louis to Buenos Aires from $384

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.
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Find the cheapest flights from St. Louis to Buenos Aires

Cheap round-trip flights

Delta Logo
3:59 pm - 2:55 pmSTL-EZE
19h 56m2 stops
Delta Logo
7:50 am - 9:58 pmEZE-STL
17h 08m2 stops
$1,019Delta
Find Deal
Thu, Nov 6 - Wed, Nov 19
Delta Logo
11:44 am - 9:00 amSTL-EZE
18h 16m1 stop
Delta Logo
8:55 pm - 1:56 pmEZE-STL
20h 01m1 stop
$1,025Delta
Find Deal
Tue, Nov 18 - Wed, Nov 26
LATAM Airlines Logo
7:05 am - 4:00 pmSTL-AEP
29h 55m2 stops
LATAM Airlines Logo
6:20 pm - 10:49 amAEP-STL
19h 29m2 stops
$1,064LATAM Airlines
Find Deal
Thu, Nov 6 - Wed, Nov 19
LATAM Airlines Logo
11:51 am - 7:55 amSTL-AEP
18h 04m2 stops
LATAM Airlines Logo
5:15 pm - 10:50 amAEP-STL
19h 35m2 stops
$1,065LATAM Airlines
Find Deal
Sun, Mar 8 - Tue, Mar 17
American Airlines Logo
2:08 pm - 9:00 amSTL-EZE
15h 52m2 stops
American Airlines Logo
11:20 pm - 1:17 pmEZE-STL
16h 57m2 stops
$1,073American Airlines
Find Deal
Thu, Nov 6 - Wed, Nov 19
Multiple Airlines Logo
7:15 pm - 5:00 amSTL-EZE
31h 45m3 stops
Multiple Airlines Logo
7:50 am - 11:01 amEZE-STL
30h 11m3 stops
$1,076Multiple Airlines
Find Deal
Sat, Nov 1 - Sat, Nov 8
Multiple Airlines Logo
10:17 am - 7:30 pmSTL-EZE
30h 13m1 stop
Multiple Airlines Logo
2:40 am - 11:01 amEZE-STL
35h 21m2 stops
$1,087Multiple Airlines
Find Deal
Thu, Nov 6 - Tue, Nov 18
United Airlines Logo
11:20 am - 6:20 amSTL-EZE
17h 00m1 stop
United Airlines Logo
11:55 pm - 10:39 amEZE-STL
13h 44m1 stop
$1,100United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
United Airlines Logo
11:20 am - 6:20 amSTL-EZE
17h 00m1 stop
United Airlines Logo
10:05 pm - 12:28 pmEZE-STL
17h 23m2 stops
$1,105United Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
American Airlines Logo
12:23 pm - 8:20 amSTL-EZE
17h 57m1 stop
American Airlines Logo
10:25 pm - 12:37 pmEZE-STL
17h 12m1 stop
$1,140American Airlines
Find Deal
Fri, Oct 31 - Wed, Nov 12

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Nov 6
STL3:59 pmLambert-St Louis
19h 56m
2 stops
EZE2:55 pmBuenos Aires Ministro Pistarini
Nov 19
EZE7:50 amBuenos Aires Ministro Pistarini
17h 08m
2 stops
STL9:58 pmLambert-St Louis
$1,019
Find similar
Delta
Nov 18
STL11:44 amLambert-St Louis
18h 16m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Nov 26
EZE8:55 pmBuenos Aires Ministro Pistarini
20h 01m
1 stop
STL1:56 pmLambert-St Louis
$1,025
Find similar
Delta
Mar 8
STL11:51 amLambert-St Louis
16h 14m
2 stops
EZE6:05 amBuenos Aires Ministro Pistarini
Mar 17
EZE8:55 pmBuenos Aires Ministro Pistarini
14h 09m
1 stop
STL9:04 amLambert-St Louis
$1,065
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
Nov 6
STL2:08 pmLambert-St Louis
15h 52m
2 stops
EZE9:00 amBuenos Aires Ministro Pistarini
Nov 19
EZE11:20 pmBuenos Aires Ministro Pistarini
16h 57m
2 stops
STL1:17 pmLambert-St Louis
$1,073
Find similar
American Airlines
Oct 31
STL12:23 pmLambert-St Louis
17h 57m
1 stop
EZE8:20 amBuenos Aires Ministro Pistarini
Nov 12
EZE10:25 pmBuenos Aires Ministro Pistarini
17h 12m
1 stop
STL12:37 pmLambert-St Louis
$1,140
Find similar
American Airlines
Oct 31
STL10:36 amLambert-St Louis
18h 29m
2 stops
EZE7:05 amBuenos Aires Ministro Pistarini
Nov 12
EZE11:20 pmBuenos Aires Ministro Pistarini
16h 57m
2 stops
STL1:17 pmLambert-St Louis
$1,145
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 September 17, 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

Thu 11/6

3:59 pm-2:55 pm

2 stops19h 56m

Buenos Aires Ministro Pistarini

Wed 11/19

7:50 am-9:58 pm

2 stops17h 08m

$1,019

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Tue 11/18

11:44 am-9:00 am

1 stop18h 16m

Buenos Aires Ministro Pistarini

Wed 11/26

8:55 pm-1:56 pm

1 stop20h 01m

$1,025

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Thu 11/6

7:05 am-4:00 pm

2 stops29h 55m

Buenos Aires Jorge Newbery

Wed 11/19

6:20 pm-10:49 am

2 stops19h 29m

$1,064

St. LouisBuenos Aires

STL - AEP

STLAEP

Lambert-St Louis

Sun 3/8

11:51 am-7:55 am

2 stops18h 04m

Buenos Aires Jorge Newbery

Tue 3/17

5:15 pm-10:50 am

2 stops19h 35m

$1,065

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 11/6

2:08 pm-9:00 am

2 stops15h 52m

Buenos Aires Ministro Pistarini

Wed 11/19

11:20 pm-1:17 pm

2 stops16h 57m

$1,073

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Sat 11/1

7:15 pm-5:00 am

3 stops31h 45m

Buenos Aires Ministro Pistarini

Sat 11/8

7:50 am-11:01 am

3 stops30h 11m

$1,076

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 11/6

10:17 am-7:30 pm

1 stop30h 13m

Buenos Aires Ministro Pistarini

Tue 11/18

2:40 am-11:01 am

2 stops35h 21m

$1,087

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 10/30

11:20 am-6:20 am

1 stop17h 00m

Buenos Aires Ministro Pistarini

Thu 11/6

11:55 pm-10:39 am

1 stop13h 44m

$1,100

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Thu 10/30

11:20 am-6:20 am

1 stop17h 00m

Buenos Aires Ministro Pistarini

Thu 11/6

10:05 pm-12:28 pm

2 stops17h 23m

$1,105

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

Fri 10/31

12:23 pm-8:20 am

1 stop17h 57m

Buenos Aires Ministro Pistarini

Wed 11/12

10:25 pm-12:37 pm

1 stop17h 12m

$1,140

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 June instead. Flights to Buenos Aires in June, while not as cheap as those in September, still average around $1,177.

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 12h 48m 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
American AirlinesPriceFrom $1,023Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $1,023Free CancellationRating
7.9
7,961 reviews
Search Delta flights
United AirlinesPriceFrom $1,053Free CancellationRating
7.4
8,926 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