Cheap flights from St. Louis to Buenos Aires from $500
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Buenos Aires departing on 12/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Fly from
Fly to
Route
Depart
Return
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 1/24
5:00 am-7:25 am
1 stop23h 25m
Buenos Aires Ministro Pistarini
Tue 2/2
10:50 pm-5:38 pm
1 stop21h 48m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Wed 12/2
8:30 am-7:20 am
1 stop19h 50m
Buenos Aires Ministro Pistarini
Wed 12/9
11:55 pm-4:50 pm
1 stop19h 55m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Mon 11/30
8:30 am-9:20 am
1 stop21h 50m
Buenos Aires Ministro Pistarini
Thu 12/10
10:05 pm-9:45 am
1 stop14h 40m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Mon 11/30
6:15 am-9:20 am
1 stop24h 05m
Buenos Aires Ministro Pistarini
Wed 12/9
10:05 pm-9:45 am
1 stop14h 40m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 1/24
11:22 am-7:25 am
2 stops17h 03m
Buenos Aires Ministro Pistarini
Tue 2/2
11:35 pm-1:30 pm
2 stops16h 55m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 1/24
6:08 pm-10:15 am
1 stop13h 07m
Buenos Aires Ministro Pistarini
Tue 2/2
11:35 pm-1:30 pm
2 stops16h 55m
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Mon 11/30
10:05 am-7:40 am
2 stops18h 35m
Buenos Aires Jorge Newbery
Thu 12/10
8:05 pm-1:28 pm
2 stops20h 23m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 11/29
7:18 pm-9:40 am
1 stop35h 22m
Buenos Aires Ministro Pistarini
Wed 12/9
7:20 am-12:05 am
2 stops19h 45m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Tue 2/16
3:40 pm-7:35 am
1 stop12h 55m
Buenos Aires Ministro Pistarini
Tue 2/23
3:10 pm-10:48 am
2 stops22h 38m
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 12/13
2:33 pm-9:40 am
1 stop16h 07m
Buenos Aires Ministro Pistarini
Fri 1/22
11:35 pm-10:48 am
1 stop14h 13m
See travel insights to Buenos Aires from
How to get the cheapest flight ticket from St. Louis to Buenos Aires
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Buenos Aires?
The cheapest month to fly to Buenos Aires from St. Louis is in November. Flight prices, which tend to average around $431, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Buenos Aires from St. Louis during June instead. Flights to Buenos Aires in June, while not as cheap as those in November, still average around $1,109.
Can stopping save me money on St. Louis to Buenos Aires flights?
You could potentially save up to 8% on your flight if you consider stops on a St. Louis to Buenos Aires flight.
What is the cheapest airline that flies from Lambert-St Louis to Buenos Aires?
Copa Airlines and GOL are the most popular carriers operating from Lambert-St Louis to Buenos Aires
What airlines fly to Buenos Aires?
Delta, LATAM Airlines and American Airlines are the top three most popular airlines that fly to Buenos Aires from St. Louis according to our data. Delta is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Buenos Aires. Keep in mind that there are 3 different airlines that fly to Buenos Aires on a routine basis, so you have a few additional options to choose from.
Which airport is the most popular layover for flights between St. Louis and Buenos Aires?
Atlanta (ATL) was the most common stop: 64% of momondo users choosing 1-stop flights on this route connected there.
Which layover airport offers the lowest fares from St. Louis to Buenos Aires?
Flights via Punta Cana (PUJ) offer the lowest average round-trip price of $632.
Which layover airport has the shortest travel time from St. Louis to Buenos Aires?
Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 12h 19m.
Which layover airport has the shortest connection time from St. Louis to Buenos Aires?
Dallas (DFW) has the shortest average layover time for this route: 1h 45m.
When to book flights from St. Louis to Buenos Aires
Cheap St. Louis to Buenos Aires (STL to BUE) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Buenos Aires
Frequently asked questions about flying from St. Louis to Buenos Aires
How far is Lambert-St Louis to Buenos Aires by plane?
The straight-line distance from Lambert-St Louis to Buenos Aires is 5450.9 mi. Typically, this will take 12h 25m by plane in normal conditions.
When did momondo last update prices for flights from Lambert-St Louis Airport to Buenos Aires?
Prices for flights from Lambert-St Louis Airport to Buenos Aires are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Buenos Aires?
As of October 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Buenos Aires.
How old do you have to be to fly from Lambert-St Louis Airport to Buenos Aires?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Buenos Aires.
What documentation or ID do you need to fly to Buenos Aires?
The travel and health documents required for your trip to Buenos Aires can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Buenos Aires. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from St. Louis to Buenos Aires?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Buenos Aires is Delta (62% of total bookings). The next most popular airline is LATAM Airlines (38%).
Best airlines flying from St. Louis to Buenos Aires
Compare and see reviews for airlines that fly from St. Louis to Buenos Aires with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $431 | Free Cancellation | Rating 7.8 8,635 reviews | |||
| PriceFrom $884 | Free Cancellation | Rating 7.4 1,976 reviews | |||
| PriceFrom $1,147 | Free Cancellation | Rating 7.0 12,138 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from St. Louis to Buenos Aires?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Buenos Aires from St. Louis.
Can I find flights from St. Louis to Buenos Aires with flexible booking policies on momondo?
Yes. All flights to Buenos Aires from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from St. Louis to Buenos Aires?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Buenos Aires from St. Louis.
I’m not ready to book a flight from St. Louis to Buenos Aires right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to Buenos Aires from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.