Cheap Flights from Washington (IAD) to Posadas (PSS)

Popular airlines from Washington Dulles Intl. Airport (IAD) to Posadas (PSS-Libertador General Jose de San Martin)

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Cheap Flights from Washington to Posadas (IAD-PSS)

Prices were available within the past 7 days and start at for one-way flights and $987 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Apr 9 - Mon, Apr 27
IAD
Washington
PSS
Posadas
$987 Roundtrip, found 3 days ago
$987
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 9 from Washington to Posadas, returning Mon, Apr 27, priced at $987 found 3 days ago
United
Fri, May 1 - Thu, May 21
IAD
Washington
PSS
Posadas
$1,042 Roundtrip, found 4 days ago
$1,042
Roundtrip
found 4 days ago
Select United flight, departing Fri, May 1 from Washington to Posadas, returning Thu, May 21, priced at $1,042 found 4 days ago
United
Fri, May 1 - Mon, May 18
IAD
Washington
PSS
Posadas
$1,054 Roundtrip, found 4 days ago
$1,054
Roundtrip
found 4 days ago
Select United flight, departing Fri, May 1 from Washington to Posadas, returning Mon, May 18, priced at $1,054 found 4 days ago
United
Sun, Apr 19 - Mon, May 4
IAD
Washington
PSS
Posadas
$1,132 Roundtrip, found 4 days ago
$1,132
Roundtrip
found 4 days ago
Select United flight, departing Sun, Apr 19 from Washington to Posadas, returning Mon, May 4, priced at $1,132 found 4 days ago
United
Sat, May 23 - Wed, Jun 10
IAD
Washington
PSS
Posadas
$1,143 Roundtrip, found 4 days ago
$1,143
Roundtrip
found 4 days ago
Select United flight, departing Sat, May 23 from Washington to Posadas, returning Wed, Jun 10, priced at $1,143 found 4 days ago
United
Sat, Jun 13 - Tue, Jun 23
IAD
Washington
PSS
Posadas
$1,155 Roundtrip, found 3 days ago
$1,155
Roundtrip
found 3 days ago
Select United flight, departing Sat, Jun 13 from Washington to Posadas, returning Tue, Jun 23, priced at $1,155 found 3 days ago
United
Sat, Apr 25 - Fri, May 15
IAD
Washington
PSS
Posadas
$1,163 Roundtrip, found 4 days ago
$1,163
Roundtrip
found 4 days ago
Select United flight, departing Sat, Apr 25 from Washington to Posadas, returning Fri, May 15, priced at $1,163 found 4 days ago
United
Wed, Jun 10 - Tue, Jun 23
IAD
Washington
PSS
Posadas
$1,167 Roundtrip, found 3 days ago
$1,167
Roundtrip
found 3 days ago
Select United flight, departing Wed, Jun 10 from Washington to Posadas, returning Tue, Jun 23, priced at $1,167 found 3 days ago
United
Mon, Apr 27 - Mon, May 11
IAD
Washington
PSS
Posadas
$1,168 Roundtrip, found 3 days ago
$1,168
Roundtrip
found 3 days ago
Select United flight, departing Mon, Apr 27 from Washington to Posadas, returning Mon, May 11, priced at $1,168 found 3 days ago
avianca
Sun, Jun 14 - Tue, Jun 23
IAD
Washington
PSS
Posadas
$1,190 Roundtrip, found 3 days ago
$1,190
Roundtrip
found 3 days ago
Select avianca flight, departing Sun, Jun 14 from Washington to Posadas, returning Tue, Jun 23, priced at $1,190 found 3 days ago
United
Fri, Apr 10 - Wed, Apr 29
IAD
Washington
PSS
Posadas
$1,197 Roundtrip, found 4 days ago
$1,197
Roundtrip
found 4 days ago
Select United flight, departing Fri, Apr 10 from Washington to Posadas, returning Wed, Apr 29, priced at $1,197 found 4 days ago
United
Sat, May 30 - Mon, Jun 15
IAD
Washington
PSS
Posadas
$1,198 Roundtrip, found 4 days ago
$1,198
Roundtrip
found 4 days ago
Select United flight, departing Sat, May 30 from Washington to Posadas, returning Mon, Jun 15, priced at $1,198 found 4 days ago
United
Sun, Apr 19 - Sun, May 3
IAD
Washington
PSS
Posadas
$1,199 Roundtrip, found 4 days ago
$1,199
Roundtrip
found 4 days ago
Select United flight, departing Sun, Apr 19 from Washington to Posadas, returning Sun, May 3, priced at $1,199 found 4 days ago
United
Fri, May 1 - Fri, May 15
IAD
Washington
PSS
Posadas
$1,219 Roundtrip, found 4 days ago
$1,219
Roundtrip
found 4 days ago
Select United flight, departing Fri, May 1 from Washington to Posadas, returning Fri, May 15, priced at $1,219 found 4 days ago
avianca
Sat, Apr 18 - Sat, Apr 25
IAD
Washington
PSS
Posadas
$1,220 Roundtrip, found 3 days ago
$1,220
Roundtrip
found 3 days ago
Select avianca flight, departing Sat, Apr 18 from Washington to Posadas, returning Sat, Apr 25, priced at $1,220 found 3 days ago
United
Fri, Apr 10 - Fri, Apr 24
IAD
Washington
PSS
Posadas
$1,223 Roundtrip, found 3 days ago
$1,223
Roundtrip
found 3 days ago
Select United flight, departing Fri, Apr 10 from Washington to Posadas, returning Fri, Apr 24, priced at $1,223 found 3 days ago
Copa
Mon, Mar 16 - Tue, Mar 17
IAD
Washington
PSS
Posadas
$1,234 Roundtrip, found 4 days ago
$1,234
Roundtrip
found 4 days ago
Select Copa flight, departing Mon, Mar 16 from Washington to Posadas, returning Tue, Mar 17, priced at $1,234 found 4 days ago
United
Sat, Apr 25 - Sat, May 9
IAD
Washington
PSS
Posadas
$1,239 Roundtrip, found 3 days ago
$1,239
Roundtrip
found 3 days ago
Select United flight, departing Sat, Apr 25 from Washington to Posadas, returning Sat, May 9, priced at $1,239 found 3 days ago
United
Thu, Apr 9 - Sat, Apr 25
IAD
Washington
PSS
Posadas
$1,243 Roundtrip, found 3 days ago
$1,243
Roundtrip
found 3 days ago
Select United flight, departing Thu, Apr 9 from Washington to Posadas, returning Sat, Apr 25, priced at $1,243 found 3 days ago
avianca
Sat, Apr 18 - Sat, Apr 25
IAD
Washington
PSS
Posadas
$1,250 Roundtrip, found 3 days ago
$1,250
Roundtrip
found 3 days ago
Select avianca flight, departing Sat, Apr 18 from Washington to Posadas, returning Sat, Apr 25, priced at $1,250 found 3 days ago

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Alternative airports near Posadas

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

Select flight to Libertador General Jose de San Martin PSS. Cheapest and Closest option available. Average driving time to city center is 12 minutes. Flights from $1,471
PSS
Libertador General Jose de San Martin
CheapestClosest
Average driving time to city center12 min
Flights from $1,471

Frequently asked questions

How much does a flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) cost?
You can find cheap one-way flights and cheap return flights from $987 IAD to PSS with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to PSS ticket fares go up or down.
What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
The cheapest month to fly from IAD to PSS is April when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
Enter IAD to PSS and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
Avianca and United are just some of the carriers that fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin). Use Expedia's flight search tool to compare airlines on this route and find our cheapest option for your trip. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from IAD to PSS. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
A flight from IAD to PSS with a layover takes around 20 hours 50 minutes, with the route covering approximately 4,789 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
Select the "Business class" and "First class" filters when looking for IAD to PSS flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight with Expedia?
It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) at the last minute?
Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight and hotel package?
Securing a Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin)?
If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Posadas (PSS-Libertador General Jose de San Martin) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Libertador General Jose de San Martin
Roundtrip price
$986
Distance
4788 mi

Book with confidence

Washington to Posadas Flights

The cheapest times to fly from Washington to Posadas

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 Posadas are during the month of April. You can find some of the cheapest flights from Washington to Posadas with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Posadas

Sunday is one of the best days to book for cheap flights from Washington to Posadas: 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 Posadas

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 Posadas in 2026. 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 Washington to Posadas 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 Posadas 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 Posadas Flights

*Flight schedules are subject to change.

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*Available to One Key members.