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Cheap flights from St. Louis to Buenos Aires from $383

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 12/13. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
10:00 am - 7:20 amSTL-EZE
19h 20m1 stop
Delta Logo
8:55 pm - 11:50 amEZE-STL
16h 55m1 stop
$880Delta
Find Deal
dom., mar. 8 - mar., mar. 17
Delta Logo
10:00 am - 9:00 amSTL-EZE
21h 00m1 stop
Delta Logo
10:25 pm - 4:55 pmEZE-STL
20h 30m2 stops
$884Delta
Find Deal
dom., mar. 8 - mar., mar. 17
LATAM Airlines Logo
12:00 pm - 9:35 amSTL-EZE
18h 35m2 stops
LATAM Airlines Logo
7:45 am - 11:39 pmEZE-STL
18h 54m2 stops
$1,001LATAM Airlines
Find Deal
sáb., ene. 17 - dom., ene. 25
LATAM Airlines Logo
1:00 pm - 9:35 amSTL-EZE
18h 35m2 stops
LATAM Airlines Logo
8:00 am - 11:40 pmEZE-STL
17h 40m2 stops
$1,009LATAM Airlines
Find Deal
mié., mar. 11 - lun., mar. 23
United Airlines Logo
10:07 am - 9:20 amSTL-EZE
20h 13m1 stop
United Airlines Logo
10:55 pm - 3:54 pmEZE-STL
18h 59m1 stop
$1,026United Airlines
Find Deal
mar., feb. 10 - lun., mar. 9
United Airlines Logo
9:57 am - 9:20 amSTL-EZE
20h 23m2 stops
United Airlines Logo
9:05 pm - 2:31 pmEZE-STL
19h 26m2 stops
$1,030United Airlines
Find Deal
lun., feb. 9 - lun., mar. 9
LATAM Airlines Logo
1:00 pm - 9:35 amSTL-EZE
18h 35m2 stops
LATAM Airlines Logo
7:45 am - 9:04 amEZE-STL
27h 19m3 stops
$1,033LATAM Airlines
Find Deal
mié., mar. 11 - lun., mar. 23
United Airlines Logo
4:35 pm - 7:20 amSTL-EZE
35h 45m1 stop
United Airlines Logo
10:05 pm - 3:54 pmEZE-STL
20h 49m1 stop
$1,035United Airlines
Find Deal
dom., feb. 8 - jue., mar. 5
United Airlines Logo
4:35 pm - 7:20 amSTL-EZE
35h 45m1 stop
United Airlines Logo
10:05 pm - 2:31 pmEZE-STL
19h 26m2 stops
$1,039United Airlines
Find Deal
dom., feb. 8 - jue., mar. 5
United Airlines Logo
8:00 am - 8:20 amSTL-EZE
46h 20m2 stops
United Airlines Logo
9:05 pm - 9:24 amEZE-STL
14h 19m1 stop
$1,047United Airlines
Find Deal
dom., mar. 8 - mar., mar. 17

Air Canada flights from St. Louis to Buenos Aires

Our best Air Canada deals on St. Louis to Buenos Aires flight tickets
Air Canada
Feb 7
STL4:05 pmLambert-St Louis
20h 05m
2 stops
EZE3:10 pmBuenos Aires Ministro Pistarini
Mar 4
EZE4:45 pmBuenos Aires Ministro Pistarini
25h 44m
2 stops
STL3:29 pmLambert-St Louis
$1,234
Find similar
Air Canada
Feb 10
STL4:05 pmLambert-St Louis
20h 05m
2 stops
EZE3:10 pmBuenos Aires Ministro Pistarini
Mar 6
EZE4:45 pmBuenos Aires Ministro Pistarini
25h 44m
2 stops
STL3:29 pmLambert-St Louis
$1,269
Find similar
Air Canada
Feb 7
STL4:05 pmLambert-St Louis
20h 05m
2 stops
EZE3:10 pmBuenos Aires Ministro Pistarini
Mar 6
EZE4:45 pmBuenos Aires Ministro Pistarini
25h 44m
2 stops
STL3:29 pmLambert-St Louis
$1,294
Find similar

Delta flights from St. Louis to Buenos Aires

Our best Delta deals on St. Louis to Buenos Aires flight tickets
Delta
Mar 8
STL10:00 amLambert-St Louis
19h 20m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Mar 17
EZE8:55 pmBuenos Aires Ministro Pistarini
16h 55m
1 stop
STL11:50 amLambert-St Louis
$880
Find similar
Delta
Mar 8
STL10:00 amLambert-St Louis
21h 00m
1 stop
EZE9:00 amBuenos Aires Ministro Pistarini
Mar 17
EZE10:25 pmBuenos Aires Ministro Pistarini
20h 30m
2 stops
STL4:55 pmLambert-St Louis
$884
Find similar
Delta
Feb 6
STL3:45 pmLambert-St Louis
12h 35m
1 stop
EZE7:20 amBuenos Aires Ministro Pistarini
Mar 3
EZE4:05 amBuenos Aires Ministro Pistarini
22h 33m
2 stops
STL11:38 pmLambert-St Louis
$1,066
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 noviembre 13, 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

dom. 3/8

10:00 am-7:20 am

1 stop19h 20m

Buenos Aires Ministro Pistarini

mar. 3/17

8:55 pm-11:50 am

1 stop16h 55m

$880

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

dom. 3/8

10:00 am-9:00 am

1 stop21h 00m

Buenos Aires Ministro Pistarini

mar. 3/17

10:25 pm-4:55 pm

2 stops20h 30m

$884

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

sáb. 1/17

12:00 pm-9:35 am

2 stops18h 35m

Buenos Aires Ministro Pistarini

dom. 1/25

7:45 am-11:39 pm

2 stops18h 54m

$1,001

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mié. 3/11

1:00 pm-9:35 am

2 stops18h 35m

Buenos Aires Ministro Pistarini

lun. 3/23

8:00 am-11:40 pm

2 stops17h 40m

$1,009

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mar. 2/10

10:07 am-9:20 am

1 stop20h 13m

Buenos Aires Ministro Pistarini

lun. 3/9

10:55 pm-3:54 pm

1 stop18h 59m

$1,026

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

lun. 2/9

9:57 am-9:20 am

2 stops20h 23m

Buenos Aires Ministro Pistarini

lun. 3/9

9:05 pm-2:31 pm

2 stops19h 26m

$1,030

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

mié. 3/11

1:00 pm-9:35 am

2 stops18h 35m

Buenos Aires Ministro Pistarini

lun. 3/23

7:45 am-9:04 am

3 stops27h 19m

$1,033

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

dom. 2/8

4:35 pm-7:20 am

1 stop35h 45m

Buenos Aires Ministro Pistarini

jue. 3/5

10:05 pm-3:54 pm

1 stop20h 49m

$1,035

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

dom. 2/8

4:35 pm-7:20 am

1 stop35h 45m

Buenos Aires Ministro Pistarini

jue. 3/5

10:05 pm-2:31 pm

2 stops19h 26m

$1,039

St. LouisBuenos Aires

STL - EZE

STLEZE

Lambert-St Louis

dom. 3/8

8:00 am-8:20 am

2 stops46h 20m

Buenos Aires Ministro Pistarini

mar. 3/17

9:05 pm-9:24 am

1 stop14h 19m

$1,047

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 October instead. Flights to Buenos Aires in October, while not as cheap as those in September, still average around $1,160.

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 35m 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
11,051 reviews
Search American Airlines flights
DeltaPriceFrom $1,025Free CancellationRating
7.9
8,007 reviews
Search Delta flights
United AirlinesPriceFrom $1,081Free CancellationRating
7.4
9,017 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