$962 Cheap Flights from Rosario (ROS) to Seattle (SEA)

View $962 flight on Tue, Mar 17, 2026Opens in a new window

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

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Cheap Flights from Rosario to Seattle (ROS-SEA)

Prices were available within the past 7 days and start at $962 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How much does a flight from Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA) cost?
Grab a cheap one-way flight from $962 or cheap return flight from Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA) 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 Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA)?
is the least expensive month to fly from ROS to SEA. Traveling outside of peak seasons is often the key to finding better deals on flights.
What is the cheapest airline that flies from Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline that'll fly you from ROS to SEA, use Expedia's filter tool. Customize your search based on your travel needs, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA)?
There are no daily direct flights from Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from ROS to SEA?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary 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 Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA)?
To reach Seattle - Tacoma Intl. Airport (SEA) on schedule, choose a flight that takes off from Rosario - Islas Malvinas Intl. Airport (ROS) before 3 PM. The chance 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 Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Booking your ticket from ROS to SEA shortly 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 a ROS to SEA flight and hotel package?
Securing a ROS to SEA flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Select from our impressive 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 Rosario - Islas Malvinas Intl. Airport (ROS) to Seattle - Tacoma Intl. Airport (SEA)?
You can usually reschedule or cancel your ROS to SEA 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 whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Rosario - Islas Malvinas Intl.
Destination airport
Seattle - Tacoma Intl.
Distance
6732 mi

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Rosario to Seattle Flights

The cheapest times to fly from Rosario to Seattle

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

 

The best time to book a flight from Rosario to Seattle

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

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 Rosario to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $962 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 Rosario to Seattle 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 Rosario to Seattle 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.

 

Rosario to Seattle Flights

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