$798 Cheap Flights from Seattle (SEA) to Rosario (ROS)

View $798 flight on Mon, Jun 22, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Rosario (ROS-Rosario - Islas Malvinas Intl.)

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Cheap Flights from Seattle to Rosario (SEA-ROS)

Prices were available within the past 7 days and start at $798 for one-way flights and $1,718 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,718 Roundtrip, found 3 hours ago
$1,718
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,718 found 3 hours ago
Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,746 Roundtrip, found 3 hours ago
$1,746
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,746 found 3 hours ago
Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,749 Roundtrip, found 3 hours ago
$1,749
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,749 found 3 hours ago
Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,758 Roundtrip, found 3 hours ago
$1,758
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,758 found 3 hours ago
Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,766 Roundtrip, found 3 hours ago
$1,766
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,766 found 3 hours ago
Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,769 Roundtrip, found 3 hours ago
$1,769
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,769 found 3 hours ago
Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,789 Roundtrip, found 3 hours ago
$1,789
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,789 found 3 hours ago
Alaska Airlines
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$1,790 Roundtrip, found 3 hours ago
$1,790
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $1,790 found 3 hours ago
Copa
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$3,732 Roundtrip, found 3 hours ago
$3,732
Roundtrip
found 3 hours ago
Select Copa flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $3,732 found 3 hours ago
LATAM Airlines Group
Mon, Jun 22 - Fri, Jul 31
SEA
Seattle
ROS
Rosario
$4,200 Roundtrip, found 3 hours ago
$4,200
Roundtrip
found 3 hours ago
Select LATAM Airlines Group flight, departing Mon, Jun 22 from Seattle to Rosario, returning Fri, Jul 31, priced at $4,200 found 3 hours ago

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Flights from Seattle (SEA) to Rosario (ROS)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Rosario - Islas Malvinas Intl.
Airlines serving
Copa, LATAM Airlines Group
Roundtrip price
$1,718
Distance
6732 mi

Seattle to Rosario Flights

The cheapest times to fly from Seattle to Rosario

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

 

The best time to book a flight from Seattle to Rosario

Sunday is one of the best days to book for cheap flights from Seattle to Rosario: 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 Seattle to Rosario

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 Seattle to Rosario in 2025. You can also book with separate airlines for your outbound and return journeys, from $798 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 Seattle to Rosario 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 Seattle to Rosario 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 Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS) cost?
Snag a cheap one-way flight from $798 or cheap return flight from $1,718 from Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS) 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 Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS)?
The cheapest month to fly from SEA to ROS is June, when there's less demand. Off-peak season is typically when airlines offer better prices between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS)?
To find the cheapest airline flying from SEA to ROS, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS)?
There aren't any daily direct flights departing from Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS). But you can book flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from SEA to ROS?
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 public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS)?
To touch down at Rosario - Islas Malvinas Intl. Airport (ROS) without delays, book a flight that leaves from Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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 Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS) last-minute?
Booking your ticket from SEA to ROS just before your trip is generally more expensive. However, if there's some wiggle room with your travel times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a SEA to ROS flight and hotel package?
You'll typically save money by booking a SEA to ROS flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. After choosing your ideal accommodations and flights, consider adding extras including car rentals, tours and activities.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Rosario - Islas Malvinas Intl. Airport (ROS)?
If you reserved your SEA to ROS flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

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*Available to One Key members.