$577 Cheap Flights from St. Louis (STL) to Asuncion (ASU)

View $577 flight on Thu, May 15, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $577 for one-way flights and $1,096 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, May 27 - Fri, May 30
STL
St. Louis
ASU
Asuncion
$1,096 Roundtrip, found 5 days ago
$1,096
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, May 27 from St. Louis to Asuncion, returning Fri, May 30, priced at $1,096 found 5 days ago
Delta
Wed, May 28 - Fri, May 30
STL
St. Louis
ASU
Asuncion
$1,121 Roundtrip, found 5 days ago
$1,121
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, May 28 from St. Louis to Asuncion, returning Fri, May 30, priced at $1,121 found 5 days ago
Delta
Wed, May 28 - Sat, May 31
STL
St. Louis
ASU
Asuncion
$1,166 Roundtrip, found 5 days ago
$1,166
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, May 28 from St. Louis to Asuncion, returning Sat, May 31, priced at $1,166 found 5 days ago
Air Canada
Wed, May 14 - Wed, May 28
STL
St. Louis
ASU
Asuncion
$1,167 Roundtrip, found 6 days ago
$1,167
Roundtrip
found 6 days ago
Select Air Canada flight, departing Wed, May 14 from St. Louis to Asuncion, returning Wed, May 28, priced at $1,167 found 6 days ago
Delta
Thu, May 29 - Sat, May 31
STL
St. Louis
ASU
Asuncion
$1,176 Roundtrip, found 5 days ago
$1,176
Roundtrip
found 5 days ago
Select Delta flight, departing Thu, May 29 from St. Louis to Asuncion, returning Sat, May 31, priced at $1,176 found 5 days ago
GOL Linhas Aereas S.A.
Wed, May 14 - Wed, May 28
STL
St. Louis
ASU
Asuncion
$1,189 Roundtrip, found 6 days ago
$1,189
Roundtrip
found 6 days ago
Select GOL Linhas Aereas S.A. flight, departing Wed, May 14 from St. Louis to Asuncion, returning Wed, May 28, priced at $1,189 found 6 days ago
GOL Linhas Aereas S.A.
Wed, May 14 - Wed, May 28
STL
St. Louis
ASU
Asuncion
$1,197 Roundtrip, found 6 days ago
$1,197
Roundtrip
found 6 days ago
Select GOL Linhas Aereas S.A. flight, departing Wed, May 14 from St. Louis to Asuncion, returning Wed, May 28, priced at $1,197 found 6 days ago
LATAM Airlines Group
Wed, May 14 - Wed, May 28
STL
St. Louis
ASU
Asuncion
$1,201 Roundtrip, found 6 days ago
$1,201
Roundtrip
found 6 days ago
Select LATAM Airlines Group flight, departing Wed, May 14 from St. Louis to Asuncion, returning Wed, May 28, priced at $1,201 found 6 days ago
Delta
Fri, May 30 - Tue, Jun 3
STL
St. Louis
ASU
Asuncion
$1,202 Roundtrip, found 5 days ago
$1,202
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, May 30 from St. Louis to Asuncion, returning Tue, Jun 3, priced at $1,202 found 5 days ago
GOL Linhas Aereas S.A.
Wed, May 14 - Wed, May 28
STL
St. Louis
ASU
Asuncion
$1,207 Roundtrip, found 6 days ago
$1,207
Roundtrip
found 6 days ago
Select GOL Linhas Aereas S.A. flight, departing Wed, May 14 from St. Louis to Asuncion, returning Wed, May 28, priced at $1,207 found 6 days ago
Flights from St. Louis (STL) to Asuncion (ASU)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Silvio Pettirossi Intl.
Airlines serving
GOL Linhas Aereas S.A., LATAM Airlines Group, United
Roundtrip price
$1,095
Distance
4904 mi

St. Louis to Asuncion Flights

The cheapest times to fly from St. Louis to Asuncion

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

 

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

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

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 Asuncion in 2025. You can also book with separate airlines for your outbound and return journeys, from $577 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 Asuncion 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 Asuncion 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 Lambert-St. Louis Intl. Airport (STL) to Silvio Pettirossi Intl. Airport (ASU) cost?
Discover the latest flight deals from STL to ASU 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 STL to ASU?
The cheapest flights from STL to ASU 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 STL to ASU?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from STL to ASU. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Silvio Pettirossi Intl. Airport (ASU)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Silvio Pettirossi Intl. Airport (ASU) aren’t available daily, so you’ll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and pick either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from STL to ASU?
You’ll generally find Tuesday the quietest day for flights, while Fridays tend to be 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 Lambert-St. Louis Intl. Airport (STL) to Silvio Pettirossi Intl. Airport (ASU)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Silvio Pettirossi Intl. Airport (ASU) route, aim to fly before 3 PM. Departures after this hour have a 22% higher chance of being canceled.**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 Silvio Pettirossi Intl. Airport (ASU) last-minute?
Last-minute bookings from STL to ASU are typically more expensive. To lock in the lowest prices, start looking for flights well in advance. That said, if you’re flexible with your travel plans, it’s possible to land a cheap fare just before your departure.
Is it cheaper to book a STL to ASU flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to ASU flight and hotel package with Expedia could lead to significant savings. What’s more, having it all in one place will take the stress out of travel planning. Just pick your flights and choose from our wide range of hotels, then personalize your trip with other add-ons like car rentals and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Silvio Pettirossi Intl. Airport (ASU)?
In most instances, you can cancel or reschedule your STL to ASU flight. However, additional fees may apply, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline’s guidelines and fees on flight changes, or if you want more information, head to our Customer Service portal.

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*Available to One Key members.