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

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Buenos Aires (BAI)

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI) cost?
Secure a cheap one-way flight or cheap return flight from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI)?
Planning your getaway for can help you save, as it's the cheapest month for flights between STL and BAI. You'll typically find the lowest fares during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from STL to BAI. Then, sort your results by "Price (lowest to highest)" to pick up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI)?
There are no daily nonstop flights available from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI). But you can book flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from STL to BAI?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can change based on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI)?
To touch down at Buenos Aires (BAI) without delays, select a flight that leaves Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI) last-minute?
Last-minute fares from STL to BAI are generally more expensive. To lock in the cheapest rates, start searching for flights early. That said, if you can play around with your travel dates, you may score a cheap ticket right before you leave.
Is it cheaper to book a STL to BAI flight and hotel package?
You can save money by securing a STL to BAI flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one convenient place. After choosing your preferred accommodations and flights, you can add extras such as tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Buenos Aires (BAI)?
Typically, you can modify or cancel your STL to BAI flight. However, additional charges may apply, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you'd like further details, visit our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Buenos Aires
Distance
2089 mi

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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 . 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 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.

 

St. Louis to Buenos Aires Flights
*Available to One Key members.