$614 Cheap Flights from Asuncion (ASU) to St. Louis (STL)

View $614 flight on Wed, Nov 12, 2025Opens in a new window

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

Prices were available within the past 7 days and start at $614 for one-way flights and $1,095 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Copa
Tue, Oct 14 - Sat, Oct 25
ASU
Asuncion
STL
St. Louis
$1,095 Roundtrip, found 1 day ago
$1,095
Roundtrip
found 1 day ago
Select Copa flight, departing Tue, Oct 14 from Asuncion to St. Louis, returning Sat, Oct 25, priced at $1,095 found 1 day ago
Copa
Wed, Nov 12 - Tue, Nov 18
ASU
Asuncion
STL
St. Louis
$1,214 Roundtrip, found 1 day ago
$1,214
Roundtrip
found 1 day ago
Select Copa flight, departing Wed, Nov 12 from Asuncion to St. Louis, returning Tue, Nov 18, priced at $1,214 found 1 day ago
LATAM Airlines Group
Sat, Feb 7 - Sat, Feb 21
ASU
Asuncion
STL
St. Louis
$1,282 Roundtrip, found 1 day ago
$1,282
Roundtrip
found 1 day ago
Select LATAM Airlines Group flight, departing Sat, Feb 7 from Asuncion to St. Louis, returning Sat, Feb 21, priced at $1,282 found 1 day ago
LATAM Airlines Group
Sat, Feb 7 - Sat, Feb 21
ASU
Asuncion
STL
St. Louis
$1,291 Roundtrip, found 1 day ago
$1,291
Roundtrip
found 1 day ago
Select LATAM Airlines Group flight, departing Sat, Feb 7 from Asuncion to St. Louis, returning Sat, Feb 21, priced at $1,291 found 1 day ago
LATAM Airlines Group
Wed, Nov 19 - Mon, Dec 8
ASU
Asuncion
STL
St. Louis
$1,293 Roundtrip, found 1 day ago
$1,293
Roundtrip
found 1 day ago
Select LATAM Airlines Group flight, departing Wed, Nov 19 from Asuncion to St. Louis, returning Mon, Dec 8, priced at $1,293 found 1 day ago
LATAM Airlines Group
Sat, Feb 7 - Sat, Feb 21
ASU
Asuncion
STL
St. Louis
$1,293 Roundtrip, found 1 day ago
$1,293
Roundtrip
found 1 day ago
Select LATAM Airlines Group flight, departing Sat, Feb 7 from Asuncion to St. Louis, returning Sat, Feb 21, priced at $1,293 found 1 day ago
Copa
Wed, Nov 12 - Wed, Nov 19
ASU
Asuncion
STL
St. Louis
$1,301 Roundtrip, found 1 day ago
$1,301
Roundtrip
found 1 day ago
Select Copa flight, departing Wed, Nov 12 from Asuncion to St. Louis, returning Wed, Nov 19, priced at $1,301 found 1 day ago
LATAM Airlines Group
Sat, Feb 7 - Sat, Feb 21
ASU
Asuncion
STL
St. Louis
$1,302 Roundtrip, found 1 day ago
$1,302
Roundtrip
found 1 day ago
Select LATAM Airlines Group flight, departing Sat, Feb 7 from Asuncion to St. Louis, returning Sat, Feb 21, priced at $1,302 found 1 day ago
United
Wed, Nov 12 - Wed, Nov 19
ASU
Asuncion
STL
St. Louis
$1,589 Roundtrip, found 1 day ago
$1,589
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 12 from Asuncion to St. Louis, returning Wed, Nov 19, priced at $1,589 found 1 day ago
GOL Linhas Aereas S.A.
Sat, Feb 7 - Sat, Feb 21
ASU
Asuncion
STL
St. Louis
$1,871 Roundtrip, found 1 day ago
$1,871
Roundtrip
found 1 day ago
Select GOL Linhas Aereas S.A. flight, departing Sat, Feb 7 from Asuncion to St. Louis, returning Sat, Feb 21, priced at $1,871 found 1 day ago
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
$1,094
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 October. 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 $614 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?
Secure a cheap one-way flight from $614 or cheap return flight from $1,095 from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL)?
Planning your trip for October may help you find better deals, as it's the cheapest month for flights between ASU and STL. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Silvio Pettirossi Intl. Airport (ASU) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from ASU to STL, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
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.