STL - BUE

$352 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 4/25. 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
$1,034
LATAM Airlines
Tue 6/23Tue 6/30
STL - EZE • 2 stops
Cheapest one-way
$352
Multiple Airlines
Sat 4/25
STL - EZE • 3 stops
Top airlines
LATAM Airlines
Cheapest • from $1,034 (round-trip)
Delta
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
Miami (MIA)
Cheapest • Avg $1,281 (round-trip)
Atlanta (ATL)
Shortest trip • 13h 24m (one-way)
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 19% price drop
December
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

Tue, Jun 23 - Tue, Jun 30
LATAM Airlines Logo
2:18 pm - 9:20 am
STL
-
EZE
17h 02m
2 stops
LATAM Airlines Logo
8:10 pm - 3:58 pm
EZE
-
STL
21h 48m
1 stop
$1,034LATAM Airlines
Tue, Jun 23 - Tue, Jun 30
LATAM Airlines Logo
1:30 pm - 9:40 am
STL
-
AEP
18h 10m
2 stops
LATAM Airlines Logo
3:45 pm - 12:54 pm
AEP
-
STL
23h 09m
2 stops
$1,047LATAM Airlines
Tue, Jun 23 - Tue, Jun 30
LATAM Airlines Logo
2:18 pm - 9:20 am
STL
-
EZE
17h 02m
2 stops
LATAM Airlines Logo
12:15 pm - 10:45 am
EZE
-
STL
24h 30m
2 stops
$1,062LATAM Airlines
Tue, Jun 23 - Tue, Jun 30
LATAM Airlines Logo
1:30 pm - 9:45 am
STL
-
EZE
18h 15m
1 stop
LATAM Airlines Logo
8:10 pm - 8:07 am
EZE
-
STL
13h 57m
1 stop
$1,065LATAM Airlines
Tue, May 26 - Wed, Jun 3
LATAM Airlines Logo
6:57 pm - 9:45 am
STL
-
EZE
12h 48m
1 stop
LATAM Airlines Logo
8:10 pm - 8:18 am
EZE
-
STL
14h 08m
1 stop
$1,071LATAM Airlines
Mon, May 25 - Tue, Jun 2
LATAM Airlines Logo
7:01 pm - 5:00 pm
STL
-
AEP
19h 59m
2 stops
LATAM Airlines Logo
3:45 pm - 9:44 am
AEP
-
STL
19h 59m
2 stops
$1,089LATAM Airlines
Tue, May 26 - Wed, Jun 3
Delta Logo
10:49 am - 9:20 am
STL
-
EZE
20h 31m
2 stops
Delta Logo
8:10 pm - 8:18 am
EZE
-
STL
14h 08m
1 stop
$1,101Delta
Tue, May 26 - Wed, Jun 3
Air Canada Logo
1:00 pm - 2:30 pm
STL
-
EZE
47h 30m
3 stops
Air Canada Logo
4:35 pm - 8:25 pm
EZE
-
STL
29h 50m
2 stops
$1,105Air Canada
Tue, May 26 - Wed, Jun 3
Air Canada Logo
1:00 pm - 2:30 pm
STL
-
EZE
47h 30m
3 stops
Air Canada Logo
4:35 pm - 8:25 pm
EZE
-
STL
53h 50m
3 stops
$1,118Air Canada
Wed, May 27 - Fri, Jun 5
Avianca Logo
6:55 pm - 5:40 am
STL
-
AEP
32h 45m
2 stops
Avianca Logo
7:00 am - 8:41 am
AEP
-
STL
27h 41m
2 stops
$1,752Avianca
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 June and January, where the average cost of round-trip tickets is $1,473 and $1,410 respectively.

Good to know

Low seasonFebruary
Cheapest flight$352
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly with an average 4% increase in price.
Flight from St. Louis to Buenos Aires Ministro Pistarini

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 $352 for a one-way ticket and $1,034 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 $1,355 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 8258 reviews
8.1Boarding
7.8Entertainment
8.5Crew
7.9Comfort
7.2Food
Airline reviews

There was an unruly family behind us that made the short flight miserable!!! The cabin crew did nothing to contain it.

2.0 MediocreNeil, Mar 2026
JFK - ORD
Read more Delta reviews

There was an unruly family behind us that made the short flight miserable!!! The cabin crew did nothing to contain it.

My seatback screen didn’t work so that sucked because that’s what I was going to do on the plane.

Left a few minutes early. Got in 15 minutes early. Very attentive service on board. Very organized boarding.

The whole experience was excellent. As it most often is with Delta

Cabin was not pressurized properly. Several passengers had respiratory difficulties.

I was happy that I was able to get a last minute flight but unfortunately my seat was a middle seat. Even with Delta Comfort I wasn't comfortable

There’s not much to say about a one hour flight. This is a connection from LA to RNO that I missed the previous night due to a mechanical check delay on my originating flight from JFK to LAX. The short flight itself was fine. Instructions from the pilot and crew were per usual. The coffee was barely lukewarm, which possibly was purposeful so we would down it quickly. Bags were already on carousel upon reaching baggage claim, which was excellent.

Flight was warm for first few hours and quite rough

Seat was extremely hard which made even a short 1 hour 20 minute flight fairly uncomfortable.

Everything was good except wifi and a leaking drink chiller. The floor was all wet and my bag was soaked. Did not notice until debarking. Have not heard back from Delta. Even though this was leg one of an international flight in first class, they denied access to their Sky Club - very disappointing!

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.

Flight delay for mechanical. Inbound arrived on time. No one said why mechanical delay.

Forced to check bags. Crew uninterested in collecting trash. Unclean seats.

why would I bother with this airline and pick seats when I am asked to move for a weight imbalance

Flight pulled out on time but sat on runway for 30 mins. It was extremely cold in the aircraft despite wearing a winter coat. Surprisingly they had a vegetarian meal but could have some better snack choices for a 8 hour flight.

We had a male flight attendant who was super attentive and wonderful! Very professional. I have both gluten and dairy intolerance, and was only able to get a gluten free part, and not the dairy free part of the meal. Easy to order ahead of time and I appreciate being able to do that.

Snow delayed boarding several times, which I understand happens. Issue I had was that after we did board, pilot told us we were going to roll out to be de-iced, then on our way. We were de-iced once, taxied to the tarmac and then stopped. Sat for another 30 minutes or so, the another de-icing. Then we rolled out to a parking spot, only to sit for another hour due to a traffic stop in DCA, which I'm confident they knew would happen before we boarded. Pilot gave no updates other than we had to hold, attendants did speak to the crew, but when asked, said the pilot would be updating us. We on the ground in the plane waiting for over 2 hours. They did communicate that bathrooms would be open, but no other news until we left. Would have been better to be up front about status.

Good crew and flight was on time. It’s a small plane with limited overhead luggage space. They said the overhead space was full and I had to check my bag. There was still space when I got on. Waiting for my checked luggage added 30 minutes to my trip. Not the end of the world but also not great.

My seat was assigned last row behind restrooms No legroom’s I’m very Pettit Still was not comfortable Food choice was excellent

Delayed initially because they couldn’t print the flight details. Poor instruction on delay. When I got on the plane the flight attendant argued with me about whether my carry on would fit (it did, although she didn’t acknowledge that). No greeting (other than arguing with me) getting on or off the plane.

Overall good. The pilots and flight attendants are excellent! The equipment was the issue on my First flight as they had to wait for a part to be installed. So the take off was at least 30 minutes later.

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

Information on your arrival and departure airports