STL - BUE

$348 Find Cheap Flights from St. Louis to Buenos Aires

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Buenos Aires departing on 4/15. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Buenos Aires

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Buenos Aires, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Buenos Aires, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$975
LATAM Airlines
Wed 6/17Wed 6/24
STL - EZE • 1 stop
Cheapest one-way
$348
Multiple Airlines
Wed 4/15
STL - AEP • 3 stops
Top airlines
Cheapest • from $975 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Buenos Aires. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $1,281 (round-trip)
Shortest trip • 13h 24m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 20% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Buenos Aires!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Buenos Aires (STL-BUE)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Buenos Aires that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Buenos Aires

Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
9:00 am - 9:45 am
STL
-
EZE
22h 45m
1 stop
LATAM Airlines Logo
8:10 pm - 8:07 am
EZE
-
STL
13h 57m
1 stop
$975LATAM Airlines
Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
5:30 pm - 6:30 pm
STL
-
AEP
23h 00m
2 stops
LATAM Airlines Logo
9:25 am - 10:45 am
AEP
-
STL
27h 20m
2 stops
$987LATAM Airlines
Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
11:51 am - 9:20 am
STL
-
EZE
19h 29m
2 stops
LATAM Airlines Logo
8:10 pm - 8:07 am
EZE
-
STL
13h 57m
1 stop
$1,013LATAM Airlines
Mon, Jun 15 - Thu, Jun 25
LATAM Airlines Logo
7:05 pm - 5:00 pm
STL
-
AEP
19h 55m
2 stops
LATAM Airlines Logo
9:25 am - 6:02 pm
AEP
-
STL
34h 37m
2 stops
$1,019LATAM Airlines
Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
5:30 pm - 6:30 pm
STL
-
AEP
23h 00m
2 stops
LATAM Airlines Logo
7:20 pm - 8:07 am
AEP
-
STL
38h 47m
3 stops
$1,043LATAM Airlines
Wed, Jun 17 - Wed, Jun 24
LATAM Airlines Logo
1:30 pm - 9:00 pm
STL
-
EZE
29h 30m
2 stops
LATAM Airlines Logo
12:15 pm - 10:45 am
EZE
-
STL
24h 30m
2 stops
$1,057LATAM Airlines
Wed, Jun 24 - Tue, Jul 14
LATAM Airlines Logo
5:30 pm - 9:45 am
STL
-
EZE
14h 15m
1 stop
LATAM Airlines Logo
3:55 am - 11:38 pm
EZE
-
STL
21h 43m
2 stops
$1,062LATAM Airlines
Mon, May 4 - Tue, May 12
LATAM Airlines Logo
11:42 am - 9:45 am
STL
-
EZE
20h 03m
1 stop
LATAM Airlines Logo
8:10 pm - 12:20 pm
EZE
-
STL
18h 10m
1 stop
$1,073LATAM Airlines
Mon, May 4 - Tue, May 12
LATAM Airlines Logo
4:41 pm - 9:45 am
STL
-
EZE
15h 04m
1 stop
LATAM Airlines Logo
8:10 pm - 8:10 am
EZE
-
STL
14h 00m
1 stop
$1,074LATAM Airlines
Mon, May 4 - Tue, May 12
American Airlines Logo
2:33 pm - 11:05 am
STL
-
EZE
18h 32m
2 stops
American Airlines Logo
8:35 pm - 12:48 pm
EZE
-
STL
18h 13m
2 stops
$1,101American Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to Buenos Aires flights

Get data-powered insights and trends into flights from St. Louis to Buenos Aires to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from St. Louis to Buenos Aires?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Buenos Aires, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Buenos Aires is September, where tickets cost $1,056 (return) on average. On the other hand, the most expensive months are November and June, where the average cost of round-trip tickets is $1,545 and $1,473 respectively.

Good to know

Low seasonFebruary
Cheapest flight$348
Most popular time to fly with an average 3% increase in price.
Flight from St. Louis to Buenos Aires Jorge Newbery

When to book flights from St. Louis to Buenos Aires

Are your dates flexible? Find out the best times to travel from St. Louis to Buenos Aires based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Buenos Aires

  • What is the cheapest flight from St. Louis to Buenos Aires?

    In the last 3 days, the lowest price for a flight from St. Louis to Buenos Aires was $348 for a one-way ticket and $975 for a round-trip.

  • Do I need a passport to fly between St. Louis and Buenos Aires?

    A passport is required to fly from St. Louis to Buenos Aires.

  • Which airports will I be using when flying from St. Louis to Buenos Aires?

    St. Louis is served by only 1 airport and there are 2 airports in Buenos Aires. You will leave St. Louis from Lambert-St Louis and you will be arriving in Buenos Aires at one of these airports: Buenos Aires Jorge Newbery or Buenos Aires Ministro Pistarini.

  • Which aircraft models fly most regularly from St. Louis to Buenos Aires?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Buenos Aires?

    SkyTeam is the only airline alliance operating flights between St. Louis and Buenos Aires.

  • Which is the best airline for flights from St. Louis to Buenos Aires, Delta or LATAM Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Buenos Aires are Delta and LATAM Airlines. With an average price for the route of $1,365 and an overall rating of 7.9, Delta is the most popular choice. LATAM Airlines is also a great choice for the route, with an average price of $1,256 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from St. Louis to Buenos Aires?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Buenos Aires.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Buenos Aires?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Buenos Aires from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Buenos Aires?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Buenos Aires with an airline and back to St. Louis with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Buenos Aires?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Buenos Aires from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from St. Louis to Buenos Aires

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Buenos Aires. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Buenos Aires? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8278 reviews
7.9Comfort
8.1Boarding
7.8Entertainment
7.2Food
8.5Crew
Airline reviews

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

2.0 MediocreIsabella, Mar 2026
SLC - AUS
Read more Delta reviews

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was flying with 30% capacity. The flight my seat from preferred seating to back of the seat. Even though i can understand that this was to balance the flight weight. The flight attendance decided to do the serving near my seat and in the middle , their noices woke me up from sleep , when i realized that the service has ended and when they were going back asked for a coffee, for which they answered they have completed teh service in my location. That really upset me as they woke me up and also rejected the coffee i asked. I ended up landing with a headache, thanks to the crew that screwed up my travel

Delayed. Hot. Passenger next to me was so large I couldn’t move.

Same experience as the flight from Norfolk to Atlanta where people are boarded in zones that don't make sense. People behind you on the plane will get on before you and they take the luggage space on your row.

The boarding process doesn't make sense since some people that will sit behind your rows are boarded before you and then they take up the luggage space above your head. I then have to wait for people to get off the plane before I can go back to get my luggage.

Deleted flight made me loose my connection flight now stuck in Atlanta for a day

Apart of Sky miles delta. And they go everywhere in Brazil

We traveled with two young children, and it was not possible for our family to be seated together. No one offered help or assistance to organize seating so we could sit with our kids. In the end, we managed to find two seats in Economy so I could at least sit with one of them, even though I had originally paid for Comfort+. In summary, I had to downgrade my seat just to be able to sit with one of my children, which was very disappointing

I booked a flight through Kayak to Brazil I have traveled to Brazil several times before Kayak Delta or LATAM never mentioned during the booking or in the pre flight process that the visa requirements to visit Brazil have changed earlier this year. I was unaware of this change and as such never got a visa and was unable to fly from JFK to Sao Paulo Add to this that Delta allowed me to fly from Boston to JFK which they should not have as I didn’t have a visa. It has been a terrible experience and a huge loss of money

Good flight, boarding ok and crew very nice. Flight was not full so I was able to be very comfortable. Blanket and pillow provided with was good as it was very cold during the flight . Food was very good(small snack sandwich and an excellent piece of orange cake). Overall good flight, no complaints.

Latam may be the worst airline in the world, far worse than even the lowest of low cost airlines in the USA. I wasted hours trying to PAY THEM TO CHECK A BAG! Then they misled me at the terminal, sent me through the wrong security line, the list goes on and on... Just absolutely terrible in every way. Avoid at all costs.

The plane broke down at the Lima stopover and they offered to put me on a flight the be t day but I had to be back in LA that morning and so I had to buy another ticket from Avianca and United for $2k I asked LATAM for compensation and received none. Very bad experience

The flight was late. Please do not delay next time.

I couldn't travel, now I can't get a refund and to change the date I have to pay an absurd fine.

My biggest complaint is the comfort. I am not tall and there was no legroom. It was very uncomfortable. During my transfer in Sao Paola, the flight was slightly delayed so boarding was confusing because there were no instructions in English.

Dloght delayed by 2.5 hrs . Common theme in my last four american floghts

American continues to decline in their customer service and its beyond disappointing.

Mechanical issue delayed us 2hrs and then once we landed sat on tarmac for 30mins because someone left a vehicle in front of the gaye

The crew was excellent and overall the flight was good. No complaints.

I didn't end up taking this flight. I got up at 4am for a flight that was supposed to board at 6am - at 5:55am you delayed the flight to 10am. The airport is under construction so I switched to a later flight as I wasn't going to sit in the airport for 4 hours. They said the delay was due to the crew needing rest from a flight coming in late the night before - if that was the case then I think you should have delayed the flight much sooner so that passengers wouldn't get up so early and get to the airport to sit and wait.

Never had such a lazy first class attendant. Literally spent 60%+ of the flight playing games on her personal phone making up excuses of why she was unavailable.

The flight attendants and the service is getting worse by the day.

Not to have gotten delayed by 2+ hours for the fourth straight American flight. They're the worst.

Like all of the flights I took to get down to Dallas. They were delayed

Other than nearly three hour delay for maintenance issues, everything went smooth

Everything you need to know for your flight from St. Louis to Buenos Aires

Information on your arrival and departure airports