STL - EZE

$347 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 1/7. 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 Ministro Pistarini Airport

 
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
$1,018
LATAM Airlines
Tue 3/31Mon 4/6
STL - EZE • 1 stop
Cheapest one-way
$347
Multiple Airlines
Wed 1/7
STL - EZE • 3 stops
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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!
Flight Deals
Booking Insights
Flight Deals

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

 
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, Mar 31 - Mon, Apr 6
LATAM Airlines Logo
5:00 pm - 9:45 am
STL
-
EZE
14h 45m1 stop
LATAM Airlines Logo
3:55 am - 11:42 pm
EZE
-
STL
21h 47m2 stops
$1,018LATAM Airlines
Tue, Mar 31 - Tue, Apr 7
LATAM Airlines Logo
1:00 pm - 8:35 am
STL
-
EZE
17h 35m2 stops
LATAM Airlines Logo
7:35 am - 11:42 pm
EZE
-
STL
18h 07m2 stops
$1,022LATAM Airlines
Mon, Jan 26 - Tue, Feb 3
LATAM Airlines Logo
3:45 pm - 9:00 am
STL
-
EZE
14h 15m1 stop
LATAM Airlines Logo
8:55 pm - 8:53 am
EZE
-
STL
14h 58m1 stop
$1,026LATAM Airlines
Thu, Feb 12 - Thu, Feb 19
LATAM Airlines Logo
11:55 am - 9:35 am
STL
-
EZE
18h 40m2 stops
LATAM Airlines Logo
11:55 pm - 11:02 am
EZE
-
STL
14h 07m1 stop
$1,030LATAM Airlines
Sun, Jan 25 - Mon, Feb 2
Delta Logo
6:57 pm - 9:00 am
STL
-
EZE
35h 03m1 stop
Delta Logo
8:55 pm - 8:53 am
EZE
-
STL
14h 58m1 stop
$1,034Delta
Sun, Feb 8 - Mon, Feb 16
United Airlines Logo
4:35 pm - 7:20 am
STL
-
EZE
35h 45m1 stop
United Airlines Logo
10:05 pm - 9:23 am
EZE
-
STL
14h 18m1 stop
$1,035United Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
3:58 pm - 9:35 am
STL
-
EZE
15h 37m2 stops
LATAM Airlines Logo
7:45 am - 11:42 pm
EZE
-
STL
17h 57m2 stops
$1,048LATAM Airlines
Sun, Mar 8 - Tue, Mar 17
LATAM Airlines Logo
10:02 am - 9:00 am
STL
-
EZE
20h 58m1 stop
LATAM Airlines Logo
12:00 pm - 11:45 am
EZE
-
STL
25h 45m2 stops
$1,058LATAM Airlines
Thu, Feb 5 - Sat, Feb 14
LATAM Airlines Logo
9:59 am - 9:00 am
STL
-
EZE
20h 01m1 stop
LATAM Airlines Logo
8:00 am - 11:36 pm
EZE
-
STL
18h 36m2 stops
$1,066LATAM Airlines
Thu, Feb 12 - Fri, Feb 20
LATAM Airlines Logo
11:55 am - 9:35 am
STL
-
EZE
18h 40m2 stops
LATAM Airlines Logo
8:55 pm - 9:06 am
EZE
-
STL
15h 11m1 stop
$1,070LATAM 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’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 Ministro Pistarini Airport clicked on KAYAK for each day over the last 12 months.

When flying from St. Louis to Buenos Aires, you should consider leaving on a Tuesday and avoid Wednesdays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Mondays and the most expensive ones on Sundays.

Good to know

Cheapest flight$347
Flight from St. Louis to Buenos Aires

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 St. Louis to Buenos Aires flights

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

    In the last 3 days, the lowest price for a flight from St. Louis to Buenos Aires Ministro Pistarini Airport was $347 for a one-way ticket and $1,018 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 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, 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 United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Buenos Aires are Delta and United Airlines. With an average price for the route of $1,377 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,406 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. Booking your flights between St. Louis and EZE can sometimes prove cheaper using this method.

  • 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 airlines flying 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 8009 reviews
8.1Boarding
7.9Entertainment
7.9Comfort
7.3Food
8.5Crew
Airline reviews

The food is terrible. The staff is wonderful. Comfort is good.

10.0 ExcellentRonda, Dec 2025
JAX - JFK
Read more Delta reviews

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Getting to the flight was arduous and lengthy. The flight itself was good but the food option wasn’t a good selection. I need to do a Kosher option on my return. Flight crew were nice

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

We had a lot of really rough weather but that was not Delta's fault. Pilot was amazing.

They charged a fee for 1st bag checked. Others in same party were free.

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

The movies offered were great. Staff were very pleasant and very efficient.

After a delay at the gate, C3, at Ohare on Sunday, I left my Blk ski coat on the bench at the gate, lost! Please review my lob claim, thx.

Very bad! They kept delaying my flight and wouldn’t do anything about it

They brought an empty plane to the gate. Then a flight delay was announced for maintenance and waiting on a part. I was then put on a flight to San Francisco instead with a connecting flight to my final destination. Arrived at my final destination 2 hours late.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

Flight and crew were great. United didn't inform crew of immigration process which was disappointing!

Flight team stood out for perzonal attention, kindness at bright cheery attitudes at 8am. Very helpful.

Seats had less pitch than a regional jet. Food was OK. Have to buy alcohol on US based carriers flying international. Boarding was a mess. Did not have bags but overhead space was gone quick. Would like to see the airlines enforce the one bag over and one bag under policy

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

Information on your arrival and departure airports