STL - BUE

$830 Find Cheap Flights from St. Louis to Buenos Aires

This is the cheapest round-trip 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 11/18. 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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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, Nov 18 - Wed, Nov 26
LATAM Airlines Logo
5:17 pm - 6:40 pmSTL-AEP
22h 23m2 stops
LATAM Airlines Logo
3:40 pm - 9:59 amAEP-STL
21h 19m2 stops
$830LATAM Airlines
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Tue, Nov 18 - Wed, Nov 26
Delta Logo
7:05 am - 6:20 amSTL-EZE
20h 15m2 stops
Delta Logo
8:55 pm - 9:59 amEZE-STL
16h 04m1 stop
$830Delta
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Tue, Nov 25 - Tue, Dec 2
United Airlines Logo
8:00 am - 7:20 amSTL-EZE
20h 20m2 stops
United Airlines Logo
10:05 pm - 2:25 pmEZE-STL
19h 20m2 stops
$834United Airlines
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Sat, Jan 17 - Sun, Jan 25
American Airlines Logo
7:05 am - 9:00 amSTL-EZE
22h 55m1 stop
American Airlines Logo
10:25 pm - 2:47 pmEZE-STL
19h 22m1 stop
$980American Airlines
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Sat, Jan 17 - Sun, Jan 25
American Airlines Logo
11:55 am - 9:00 amSTL-EZE
18h 05m2 stops
American Airlines Logo
10:25 pm - 2:47 pmEZE-STL
19h 22m1 stop
$984American Airlines
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Fri, Jan 9 - Fri, Jan 16
United Airlines Logo
9:57 am - 9:20 amSTL-EZE
20h 23m2 stops
United Airlines Logo
11:55 pm - 10:52 amEZE-STL
37h 57m2 stops
$1,069United Airlines
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Sun, Feb 1 - Sat, Feb 28
Multiple Airlines Logo
12:20 pm - 8:40 pmSTL-AEP
29h 20m3 stops
Multiple Airlines Logo
7:00 am - 11:01 amAEP-STL
31h 01m3 stops
$1,158Multiple Airlines
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Sun, Feb 1 - Sat, Feb 28
Multiple Airlines Logo
12:20 pm - 2:50 amSTL-EZE
35h 30m3 stops
Multiple Airlines Logo
6:15 am - 11:01 amEZE-STL
31h 46m3 stops
$1,168Multiple Airlines
Find Deal
Sun, Mar 8 - Mon, Mar 16
GOL Logo
11:30 am - 12:50 pmSTL-EZE
23h 20m2 stops
GOL Logo
3:30 am - 10:04 pmEZE-STL
20h 34m2 stops
$1,249GOL
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Sun, Mar 8 - Mon, Mar 16
GOL Logo
11:30 am - 12:50 pmSTL-EZE
23h 20m2 stops
GOL Logo
3:30 am - 10:04 pmEZE-STL
20h 34m2 stops
$1,260GOL
Find Deal

Everything you should know

Top airlines
LATAM Airlines
Cheapest • from $830 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
September
Cheapest • 17% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$830
LATAM Airlines
Tue 11/18Wed 11/26
STL - AEP • 2 stops
Cheapest one-way
Multiple Airlines
Mon 10/27
STL - BUE • multi-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Buenos Aires!
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’s the cheapest day of the week to fly from St. Louis to Buenos Aires?

The average price of all round-trip flights from St. Louis to Buenos Aires clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Buenos Aires on a Tuesday and more expensive on a Wednesday. On your return trip to St. Louis, you should consider flying back on a Monday, and avoid Sundays for better deals.

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 August, where the average cost of round-trip tickets is $1,458 and $1,423 respectively.

Good to know

Low seasonFebruary
Cheapest flight$830
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly with an average 2% 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 $830 for a round-trip ticket.

  • 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?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between St. Louis and Buenos Aires, with Star Alliance being the most commonly used for this route.

  • 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 $1,257 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 $1,105 and an overall rating of 7.5.

  • 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 4 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 7996 reviews
7.9Entertainment
8.2Boarding
7.9Comfort
7.3Food
8.5Crew
Airline reviews

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

4.0 OkayHeather, Oct 2025ANC - SEA
Read more Delta reviews

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The aircraft interior is old and tired on this aircraft. The entertainment system never worked despite the crews attempt to reset the system.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Old plane and old configuration/seats but still comfortable for a morning flight

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

Poor, the airline was not able to help me move flights.

The way the Pilot made all announcements, specially the way he congratulated the entire crew as the best team ever, making a comment that due to them they were able to shorter the delay to the destination. Amazing flight .

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

Really bad experience – delayed for 6 hours without any notice, no food or drinks provided, and stuck in the horrible Cartagena airport.

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.

I never got this flight. You sent me to Chile!!! And from Chile I got the other flight to São Paulo... I've arrived 7h latter than I was supposed to arrive because of Delta delays.

Because the flight was late, we lost the connection to Brazil. You, Delta delayed, and you Delta anticipated the door closing in 15 min from Miami to GRU. Why? It caused a lot of stress! I almost could not see my mother in law alive because of your delay.

Boarding was done by woman who insisted on strict standing in line policy; food was ok; entertainment minimal

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

Friendly and professional flight crew. Aside from departure delay after boarding, easy flight and smooth landing.

Great smooth flight. Had a seating change, but that was an improvement. Thanks United Airways Crew.

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

Flight was delayed leaving Dallas. Arrived about 2 hours later than scheduled.

Flight delayed and missed connection. Rescheduled flight cancelled after 6 hrs wait. Rerouted thru ORD, flight cancelled, overnight stay in ORD. Still in the air on new flight!

We are too tired and frustrated to comment politely at this point

Terrible. Our luggage was delayed and couldn’t be delivered for several days. We got bad information from the airline agents at baggage claim. We had to pick up our car so we wouldn’t be charged for an extra day. We got lost in the maze of airport parking. The baggage claim agents didn’t offer us any compensation for our extra time and expense. We are tired, hungry and very frustrated.

The flight was flawless and we even arrived between 20 and 25 minutes early!

The only thing to like was that we eventually got to our destination

Delayed delayed delayed and no offer for food or vouchers

Disliked having to wait a little longer to disembark from the plan when we landed in London

Typically flights with AA are good. The staff are pleasant, welcoming, and efficient.

A couple ladies from the crew were so rude and nasty. Thought they were mad at having to be there especially if you asked a question. This will make me think twice next time if I book a flight with you.

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

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