Featured airlines
- Plan, book, fly with confidence
- Be in the knowGet alerts if flight prices drop or rise*
- Book smarterSave up to 30% on select hotels after you book a flight*
Cheap Flights from St. Louis to Buenos Aires (STL-EZE)
Prices were available within the past 7 days and start at $421 for one-way flights and $977 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.
Origin airport | Lambert-St. Louis Intl. |
Destination airport | Ministro Pistarini Intl. |
Airlines serving | Air Canada, American Airlines, Copa, Delta, GOL Linhas Aereas S.A., LATAM Airlines Group, United, avianca |
Roundtrip price | $977 |
Distance | 5474 mi |
St. Louis to Buenos Aires Flights
The cheapest times to fly from St. Louis to Buenos Aires
On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Buenos Aires are during the month of May. You can find some of the cheapest flights from St. Louis to Buenos Aires with Expedia's search tool and vast selection of airlines.
The best time to book a flight from St. Louis to Buenos Aires
Sunday is one of the best days to book for cheap flights from St. Louis to Buenos Aires: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.
How to find cheap round-trip tickets from St. Louis to Buenos Aires
Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Buenos Aires in 2025. You can also book with separate airlines for your outbound and return journeys, from $421 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.
Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Buenos Aires flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.
You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Buenos Aires airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.
*Terms apply.
Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.
Frequently asked questions
Explore a world of travel with Expedia
Flights
- Flights to Puerto Iguazú
- Flights to Mar del Plata
- Flights to Villa Gesell
- Flights to Cordoba
- Flights to Pinamar
- Flights to Tunuyan
- Flights to San Carlos de Bariloche
- Flights to Posadas
- Flights to La Plata
- Flights to Salta
- Flights to El Chalten
- Flights to Rosario
- Flights to Buenos Aires
- Flights to Mendoza
- Flights to San Martín de los Andes
- Flights to Villa La Angostura
- Flights to Luján de Cuyo
- Flights to Chacras de Coria
- Flights to Ushuaia
- Flights to El Calafate
- Flights from Miami (MIA) to Buenos Aires (EZE)
- Flights from New York (LGA) to Buenos Aires (EZE)
- Flights from Washington (DCA) to Buenos Aires (EZE)
- Flights from Washington (IAD) to Buenos Aires (EZE)
- Flights from Lima (LIM) to Buenos Aires (EZE)
- Flights from Houston (IAH) to Buenos Aires (EZE)
- Flights from Boston (BOS) to Buenos Aires (EZE)
- Flights from Newark Liberty Intl. Airport (EWR) to Buenos Aires (EZE)
- Flights from Los Angeles (LAX) to Buenos Aires (EZE)
- Flights from Fort Lauderdale (FLL) to Buenos Aires (EZE)
- Flights from Chicago (ORD) to Buenos Aires (EZE)
- Flights from New York (JFK) to Buenos Aires (EZE)
- Flights from Los Angeles (LAX) to Seattle (SEA)
- Flights from St. Louis (STL) to Seattle (SEA)
- Flights from St. Louis (STL) to Punta Cana (PUJ)
- Flights from Dallas (DFW) to Chicago (ORD)
- Flights from St. Louis (STL) to New York (LGA)
- Flights from St. Louis (STL) to Tampa (TPA)
- Flights from St. Louis (STL) to Denver (DEN)
- Flights from Dallas (DFW) to Orlando (MCO)
- Flights from Boston (BOS) to Orlando (MCO)
- Flights from Philadelphia (PHL) to Orlando (MCO)
- Flights from Los Angeles (LAX) to Dallas (DFW)
- Flights from Boston (BOS) to Miami (MIA)
- Flights from St. Louis (STL) to Miami (MIA)
- Flights from Denver (DEN) to Las Vegas (LAS)
- Flights from Portland (PDX) to Las Vegas (LAS)
- Flights from Dallas (DFW) to Las Vegas (LAS)
- Flights from Minneapolis (MSP) to Las Vegas (LAS)
- Flights from Atlanta (ATL) to Las Vegas (LAS)
- Flights from Chicago (ORD) to Las Vegas (LAS)
- Flights from Houston (IAH) to Las Vegas (LAS)
- Flights from New York (NYC) to Las Vegas (LAS)
- Flights from Los Angeles (LAX) to Las Vegas (LAS)
- Flights from Detroit (DTW) to Las Vegas (LAS)
- Flights from San Francisco (SFO) to Las Vegas (LAS)
- Flights from Seattle (SEA) to Las Vegas (LAS)
- Flights from St. Louis (STL) to Fort Lauderdale (FLL)
- Flights from Los Angeles (LAX) to New York (NYC)
- Flights from Miami (MIA) to New York (NYC)
- Flights from Atlanta (ATL) to New York (NYC)
- Flights from Dallas (DFW) to New York (NYC)
- Flights from Dallas (DFW) to Cancun (CUN)
- Flights from St. Louis (STL) to Los Angeles (LAX)
- Flights from New York (NYC) to Los Angeles (LAX)
- Flights from Dallas (DFW) to Los Angeles (LAX)
- Flights from Seattle (SEA) to Los Angeles (LAX)
- Flights from Las Vegas (LAS) to Los Angeles (LAX)
- Flights from St. Louis (STL) to Phoenix (PHX)
- Flights from Seattle (SEA) to Phoenix (PHX)
- Flights from St. Louis (STL) to Newark Liberty Intl. Airport (EWR)
- Flights from St. Louis (STL) to Honolulu (HNL)
- Flights from St. Louis (STL) to New York (JFK)
- Flights from New York (NYC) to Atlanta (ATL)
- Aer Lingus
- British Airways
- United
- Frontier Airlines
- Lufthansa
- Aeromexico
- Air France
- American Airlines
- Turkish Airlines
- Alaska Airlines
- Air Canada
- Delta
- KLM
- Qatar Airways
- Iberia
- Finnair
- United Newark Liberty Intl. Airport (EWR) to Buenos Aires (EZE) flights
- Alaska Airlines St. Louis (STL) to Seattle (SEA) flights
- Delta St. Louis (STL) to New York (LGA) flights
- American Airlines St. Louis (STL) to Tampa (TPA) flights
- United St. Louis (STL) to Denver (DEN) flights
- American Airlines St. Louis (STL) to Miami (MIA) flights
- Delta St. Louis (STL) to Fort Lauderdale (FLL) flights
- Alaska Airlines St. Louis (STL) to Los Angeles (LAX) flights
- American Airlines St. Louis (STL) to Phoenix (PHX) flights
- United St. Louis (STL) to Newark Liberty Intl. Airport (EWR) flights
- Alaska Airlines St. Louis (STL) to Honolulu (HNL) flights
- Flights from Williamson County Regional
- Flights from St. Robert Regional
- Flights from Decatur
- Flights from Columbia Regional
- Flights from Cairo Regional
- Flights from Roy Otten Memorial Airfield
- Flights from Quincy Regional-Baldwin Field
- Flights from Cape Girardeau Municipal
- Flights from Abraham Lincoln Capital
- Flights from Spirit of St. Louis