$619 Cheap Flights from Asuncion (ASU) to St. Louis (STL)

View $619 flight on Thu, Dec 11, 2025Opens in a new window

Popular airlines from Asuncion (ASU-Silvio Pettirossi Intl.) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Asuncion to St. Louis (ASU-STL)

Prices were available within the past 7 days and start at $619 for one-way flights and $1,279 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Copa
Mon, Aug 4 - Mon, Aug 11
ASU
Asuncion
STL
St. Louis
$1,279 Roundtrip, found 6 days ago
$1,279
Roundtrip
found 6 days ago
Select Copa flight, departing Mon, Aug 4 from Asuncion to St. Louis, returning Mon, Aug 11, priced at $1,279 found 6 days ago
LATAM Airlines Group
Sat, Dec 20 - Mon, Dec 29
ASU
Asuncion
STL
St. Louis
$1,362 Roundtrip, found 4 days ago
$1,362
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Sat, Dec 20 from Asuncion to St. Louis, returning Mon, Dec 29, priced at $1,362 found 4 days ago
LATAM Airlines Group
Sat, Dec 20 - Mon, Dec 29
ASU
Asuncion
STL
St. Louis
$1,371 Roundtrip, found 4 days ago
$1,371
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Sat, Dec 20 from Asuncion to St. Louis, returning Mon, Dec 29, priced at $1,371 found 4 days ago
LATAM Airlines Group
Wed, Jan 7 - Wed, Jan 14
ASU
Asuncion
STL
St. Louis
$1,372 Roundtrip, found 6 days ago
$1,372
Roundtrip
found 6 days ago
Select LATAM Airlines Group flight, departing Wed, Jan 7 from Asuncion to St. Louis, returning Wed, Jan 14, priced at $1,372 found 6 days ago
LATAM Airlines Group
Sat, Dec 20 - Mon, Dec 29
ASU
Asuncion
STL
St. Louis
$1,389 Roundtrip, found 4 days ago
$1,389
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Sat, Dec 20 from Asuncion to St. Louis, returning Mon, Dec 29, priced at $1,389 found 4 days ago
LATAM Airlines Group
Sat, Dec 20 - Mon, Dec 29
ASU
Asuncion
STL
St. Louis
$1,397 Roundtrip, found 4 days ago
$1,397
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Sat, Dec 20 from Asuncion to St. Louis, returning Mon, Dec 29, priced at $1,397 found 4 days ago
LATAM Airlines Group
Sat, Dec 20 - Mon, Dec 29
ASU
Asuncion
STL
St. Louis
$1,398 Roundtrip, found 4 days ago
$1,398
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Sat, Dec 20 from Asuncion to St. Louis, returning Mon, Dec 29, priced at $1,398 found 4 days ago
LATAM Airlines Group
Sat, Dec 20 - Mon, Dec 29
ASU
Asuncion
STL
St. Louis
$1,407 Roundtrip, found 4 days ago
$1,407
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Sat, Dec 20 from Asuncion to St. Louis, returning Mon, Dec 29, priced at $1,407 found 4 days ago
LATAM Airlines Group
Sat, Dec 20 - Mon, Dec 29
ASU
Asuncion
STL
St. Louis
$1,407 Roundtrip, found 4 days ago
$1,407
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Sat, Dec 20 from Asuncion to St. Louis, returning Mon, Dec 29, priced at $1,407 found 4 days ago
GOL Linhas Aereas S.A.
Mon, Aug 4 - Mon, Aug 11
ASU
Asuncion
STL
St. Louis
$1,830 Roundtrip, found 6 days ago
$1,830
Roundtrip
found 6 days ago
Select GOL Linhas Aereas S.A. flight, departing Mon, Aug 4 from Asuncion to St. Louis, returning Mon, Aug 11, priced at $1,830 found 6 days ago

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $1,512
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $1,512
Flights from Asuncion (ASU) to St. Louis (STL)
Origin airport
Silvio Pettirossi Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
GOL Linhas Aereas S.A., LATAM Airlines Group
Roundtrip price
$1,279
Distance
4904 mi

Asuncion to St. Louis Flights

The cheapest times to fly from Asuncion to St. Louis

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 Asuncion to St. Louis are during the month of August. You can find some of the cheapest flights from Asuncion to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Asuncion to St. Louis

Sunday is one of the best days to book for cheap flights from Asuncion to St. Louis: 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 Asuncion to St. Louis

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 Asuncion to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $619 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 Asuncion to St. Louis 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 Asuncion to St. Louis 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

How much does a flight from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from ASU to STL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from ASU to STL?
The cheapest flights from ASU to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from ASU to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from ASU to STL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL)?
There aren't any daily direct flights from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL). But you can opt for flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way before you know it.
What day of the week has the most flights from ASU to STL?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL)?
To land at Lambert-St. Louis Intl. Airport (STL) on time, book a flight that leaves from Silvio Pettirossi Intl. Airport (ASU) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**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 Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your ticket from ASU to STL right before your trip is typically more expensive. But if there's some wiggle room with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book an ASU to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking an ASU to STL flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one convenient place will take the hassle out of planning your trip. Just pick your flights and select from our extensive range of hotels, then tailor your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your ASU to STL flight within the last 24 hours, you may be able to cancel or modify it without any fees. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for further details.

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*Available to One Key members.