STL - BUE

$497 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 7/15. 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
$1,142
Delta
Mon 7/20Mon 8/3
STL - EZE • 1 stop
Cheapest one-way
$497
Multiple Airlines
Wed 7/15
STL - AEP • 3 stops
Top airlines
Cheapest • from $1,142 (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 $1,283 (round-trip)
Shortest trip • 13h 25m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 24% 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

Mon, Jul 20 - Mon, Aug 3
Delta Logo
9:24 am - 9:45 am
STL
-
EZE
22h 21m
1 stop
Delta Logo
8:10 pm - 6:27 pm
EZE
-
STL
24h 17m
1 stop
$1,142Delta
Tue, Sep 8 - Tue, Oct 20
Copa Airlines Logo
3:13 pm - 8:00 am
STL
-
EZE
14h 47m
1 stop
Copa Airlines Logo
9:00 pm - 2:07 pm
EZE
-
STL
19h 07m
1 stop
$1,147Copa Airlines
Tue, Aug 11 - Tue, Aug 18
United Airlines Logo
3:13 pm - 8:00 am
STL
-
EZE
14h 47m
1 stop
United Airlines Logo
9:00 pm - 10:10 am
EZE
-
STL
15h 10m
1 stop
$1,148United Airlines
Tue, Aug 11 - Tue, Aug 18
LATAM Airlines Logo
6:00 am - 6:10 am
STL
-
EZE
22h 10m
2 stops
LATAM Airlines Logo
7:35 am - 6:27 pm
EZE
-
STL
36h 52m
3 stops
$1,151LATAM Airlines
Thu, Oct 15 - Thu, Oct 22
United Airlines Logo
6:15 am - 8:00 am
STL
-
EZE
23h 45m
1 stop
United Airlines Logo
9:00 pm - 10:30 pm
EZE
-
STL
27h 30m
1 stop
$1,157United Airlines
Mon, Jul 20 - Mon, Aug 3
American Airlines Logo
1:14 pm - 8:50 am
STL
-
EZE
17h 36m
2 stops
American Airlines Logo
8:30 pm - 12:00 pm
EZE
-
STL
17h 30m
2 stops
$1,193American Airlines
Mon, Jul 20 - Mon, Aug 3
LATAM Airlines Logo
3:58 pm - 2:50 pm
STL
-
AEP
20h 52m
2 stops
LATAM Airlines Logo
3:45 pm - 9:54 am
AEP
-
STL
20h 09m
2 stops
$1,205LATAM Airlines
Fri, Sep 18 - Thu, Sep 24
LATAM Airlines Logo
6:45 pm - 9:45 am
STL
-
EZE
13h 00m
1 stop
LATAM Airlines Logo
3:55 am - 11:36 pm
EZE
-
STL
21h 41m
2 stops
$1,228LATAM Airlines
Fri, Sep 18 - Fri, Sep 25
Multiple Airlines Logo
4:59 pm - 9:40 am
STL
-
EZE
14h 41m
2 stops
Multiple Airlines Logo
7:35 am - 11:36 pm
EZE
-
STL
18h 01m
2 stops
$1,232Multiple Airlines
Sat, Jun 13 - Tue, Jun 16
Multiple Airlines Logo
2:15 pm - 3:45 am
STL
-
EZE
35h 30m
2 stops
Multiple Airlines Logo
7:10 am - 12:06 pm
EZE
-
STL
30h 56m
3 stops
$1,268Multiple 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.

How much is a round-trip flight from St. Louis to Buenos Aires?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Buenos Aires departing in July.

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 October, where tickets cost $829 (return) on average. On the other hand, the most expensive months are August and April, where the average cost of round-trip tickets is $1,365 and $1,314 respectively.

Good to know

Low seasonFebruary
Cheapest flight$497
Best time to beat the crowds with an average 1% drop 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 5 days, the lowest price for a flight from St. Louis to Buenos Aires was $497 for a one-way ticket and $1,142 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 $1,377 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 $1,269 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 8398 reviews
7.2Food
8.1Boarding
8.5Crew
7.8Comfort
7.8Entertainment
Airline reviews

Definitely a southern flavor. Cordiality was evident even though no drinks or snacks were served.

8.0 ExcellentAnonymous, Jun 2026
ATL - GNV
Read more Delta reviews

Definitely a southern flavor. Cordiality was evident even though no drinks or snacks were served.

On time! There were plenty of airport employees who were able to keep us moving in the right direction. The crew on the plane were professional.

Left /arrived on time. Decent seat space. Like the wifi/plugs and entertainment. Windows and tray table were kinda gross. Attendants didn't start snack service til 40mins before landing. Two rows before us, captain came on to say there's turbulence and recalled staff to seats. So, no drink/snack. Later, attendants didn't stop to see if we had trash nor even look our way. Felt invisible! Almost all pilot announcements were not only unintelligible, but so quiet. We had no idea what she said.

Average seat comfort, a drink and chips were provided, early boarding because we checked a carryon at the gate was nice. Ticket pricing shenanigans, including fees to pick a seat, check a bag, and get food onboard - evidence the industry is reinvigorating last century’s strategies- destroys the experience before one ever arrives at the airport. It’s difficult to recognize any value or sustain loyalty in the end-to-end process making air travel more drudgery than pleasure.

Gate agent was unhelpful for handicapped boarding. Flight attendant seemed untrained.

No service flight that took 5 hrs and a stop at an unscheduled airport. Crew and pilots did their jobs

Clean planes and not take my comfort class seat away.

The crew were efficient. The pilots seemed professional. It was a bit chilly in our seats. The sheet provided weren’t very helpful.

Weather caused a long delay, but the efficiency and updates from the pilot were helpful. We were able to make our connection fortunately.

Planes were clean, no water or snacks on either flight.

Honestly first time flying with delta and it was pretty good. All the process very smooth and crew was always nice and attentive.

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 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.

My pillow had a shoe print on it, when I asked if I can have another pillow, I was told “I’m sorry but it is one pillow per guest, do YOU want to turn it inside out” to which I responded , no thanks I will go without. This is generally not ok, but For the price tag I paid flying business this is absolutely unacceptable. Hopefully American Airlines can update their accommodations to bedding that is not tossed on the ground and stepped on, or at least have a couple of extra pillows in hand, incase someone had decided to step on the pillows for what ever reason

The flight from LA to Chicago was smooth and service was very good overall.

The flight from Dallas to Tokyo was not on Japan Airlines. It was on American Airlines. Very disappointed that we did not fly on Japan Airlines. Will not be using you liars again. I’ll just book direct from the airline next time. Wish you could make this right and has us fly on Japan Air when heading back home to the US.

The Mario was so helpful and provided amazing customer service however l have being waiting for a callback for almost a week now and have not heard anything further after l informed them l wanted to change my date of traveling because of my hospital appointment even send them proof and l was unable to use manag your booking on their website is a bit frustrating and l would appreciate an update on My request as soon as possible. And have called them times without numbers no response

They made nearly everyone check their bag because the overhead bins are way too small. Extremely inconvenient

Delayed delayed. Poor professionalism. Our seats changed and we pay for them

Was put into a seat right behind the toilet that had no entertainment possible but did have plenty of leg room over noisy part of plane.

B-class on an old plane with antiquated amenities and poor service. Landed in Rome w/o bag that didn’t make the connection (plenty of time in London). Bag will come to hotel NOT the day it lands but the following night!! Still waiting for bag…BA had nothing to offer in support and couldn’t even tell me their comp, told to submit receipts and then I’ll learn what is or isn’t covered.

Movies on my phone are great. It would be nice to have a gluten free snack option.

It was what i expected. I like the movies you can access from your phone. It would be nice if there was a gluten free snack offered. But I did bring my own snack knowing there would not be a gluten free option

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

Information on your arrival and departure airports