$375 Cheap Flights from Washington (IAD) to Asuncion (ASU)

View $375 flight on Wed, Nov 26, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Asuncion (ASU-Silvio Pettirossi Intl.)

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Cheap Flights from Washington to Asuncion (IAD-ASU)

Prices were available within the past 7 days and start at $375 for one-way flights and $829 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Nov 19 - Tue, Nov 25
IAD
Washington
ASU
Asuncion
$829 Roundtrip, found 1 day ago
$829
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 19 from Washington to Asuncion, returning Tue, Nov 25, priced at $829 found 1 day ago
Air Canada
Wed, Nov 5 - Sun, Nov 9
IAD
Washington
ASU
Asuncion
$869 Roundtrip, found 3 days ago
$869
Roundtrip
found 3 days ago
Select Air Canada flight, departing Wed, Nov 5 from Washington to Asuncion, returning Sun, Nov 9, priced at $869 found 3 days ago
Air Canada
Wed, Nov 12 - Mon, Nov 17
IAD
Washington
ASU
Asuncion
$875 Roundtrip, found 15 hours ago
$875
Roundtrip
found 15 hours ago
Select Air Canada flight, departing Wed, Nov 12 from Washington to Asuncion, returning Mon, Nov 17, priced at $875 found 15 hours ago
Air Canada
Tue, Nov 4 - Tue, Nov 11
IAD
Washington
ASU
Asuncion
$880 Roundtrip, found 3 days ago
$880
Roundtrip
found 3 days ago
Select Air Canada flight, departing Tue, Nov 4 from Washington to Asuncion, returning Tue, Nov 11, priced at $880 found 3 days ago
avianca
Sun, Oct 26 - Thu, Oct 30
IAD
Washington
ASU
Asuncion
$897 Roundtrip, found 5 days ago
$897
Roundtrip
found 5 days ago
Select avianca flight, departing Sun, Oct 26 from Washington to Asuncion, returning Thu, Oct 30, priced at $897 found 5 days ago
avianca
Thu, Oct 16 - Sat, Nov 8
IAD
Washington
ASU
Asuncion
$908 Roundtrip, found 22 hours ago
$908
Roundtrip
found 22 hours ago
Select avianca flight, departing Thu, Oct 16 from Washington to Asuncion, returning Sat, Nov 8, priced at $908 found 22 hours ago
avianca
Sun, Oct 26 - Thu, Oct 30
IAD
Washington
ASU
Asuncion
$908 Roundtrip, found 5 days ago
$908
Roundtrip
found 5 days ago
Select avianca flight, departing Sun, Oct 26 from Washington to Asuncion, returning Thu, Oct 30, priced at $908 found 5 days ago
avianca
Fri, Oct 24 - Thu, Oct 30
IAD
Washington
ASU
Asuncion
$914 Roundtrip, found 6 hours ago
$914
Roundtrip
found 6 hours ago
Select avianca flight, departing Fri, Oct 24 from Washington to Asuncion, returning Thu, Oct 30, priced at $914 found 6 hours ago
Copa
Wed, Dec 3 - Wed, Dec 10
IAD
Washington
ASU
Asuncion
$953 Roundtrip, just found
$953
Roundtrip
just found
Select Copa flight, departing Wed, Dec 3 from Washington to Asuncion, returning Wed, Dec 10, priced at $953 just found
LATAM Airlines Group
Mon, Dec 1 - Tue, Dec 9
IAD
Washington
ASU
Asuncion
$995 Roundtrip, just found
$995
Roundtrip
just found
Select LATAM Airlines Group flight, departing Mon, Dec 1 from Washington to Asuncion, returning Tue, Dec 9, priced at $995 just found

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU) cost?
Get a cheap one-way flight from $375 or cheap return flight from $829 from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU)?
November is the least expensive month to fly from IAD to ASU. Traveling outside of peak seasons is often the key to finding better deals on flights.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU)?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from IAD to ASU. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU)?
Nonstop flights from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from IAD to ASU?
You'll typically 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 Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU)?
Choose a flight from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU) that leaves before 3 PM to reduce the likelihood of delays. Departures later than this have a 22% higher chance of being canceled, on average.**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 Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU) last-minute?
Last-minute bookings from IAD to ASU are usually more expensive. For the cheapest rates, start searching for flights well ahead of time. That said, if your travel plans are flexible, you may find a cheap ticket right before your trip.
Is it cheaper to book an IAD to ASU flight and hotel package?
Compared with arranging flights and hotels separately, booking an IAD to ASU flight and hotel package with Expedia could result in significant savings. Better yet, managing everything in one place will take the hassle out of planning your trip. Just secure your flights and choose from our wide range of stays, then customize your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Silvio Pettirossi Intl. Airport (ASU)?
Usually, it's possible to reschedule or cancel your IAD to ASU flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Silvio Pettirossi Intl.
Airlines serving
Copa, GOL Linhas Aereas S.A., LATAM Airlines Group, United, avianca
Roundtrip price
$829
Distance
4618 mi

Book with confidence

Book with confidence

Washington to Asuncion Flights

The cheapest times to fly from Washington 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 Washington to Asuncion are during the month of November. You can find some of the cheapest flights from Washington to Asuncion with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Asuncion

Sunday is one of the best days to book for cheap flights from Washington 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 Washington 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 Washington to Asuncion in 2025. You can also book with separate airlines for your outbound and return journeys, from $375 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 Washington 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 Washington 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.

 

Washington to Asuncion Flights

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*Available to One Key members.