$160 Cheap Flights from Washington (DCA) to Sun Valley (SUN)

View $160 flight on Thu, May 7, 2026Opens in a new window

Popular airlines from Ronald Reagan Washington National Airport (DCA) to Sun Valley, ID (SUN-Friedman Memorial)

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Cheap Flights from Washington to Sun Valley (DCA-SUN)

Prices were available within the past 7 days and start at $160 for one-way flights and $329 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Sun, Jan 17 - Thu, Jan 21
DCA
Washington
SUN
Sun Valley
$329 Roundtrip, found 1 day ago
$329
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sun, Jan 17 from Washington to Sun Valley, returning Thu, Jan 21, priced at $329 found 1 day ago
Alaska Airlines
Sun, Dec 6 - Sat, Dec 12
DCA
Washington
SUN
Sun Valley
$345 Roundtrip, found 16 hours ago
$345
Roundtrip
found 16 hours ago
Select Alaska Airlines flight, departing Sun, Dec 6 from Washington to Sun Valley, returning Sat, Dec 12, priced at $345 found 16 hours ago
American Airlines
Tue, Jan 5 - Sun, Jan 10
DCA
Washington
SUN
Sun Valley
$349 Roundtrip, found 4 days ago
$349
Roundtrip
found 4 days ago
Select American Airlines flight, departing Tue, Jan 5 from Washington to Sun Valley, returning Sun, Jan 10, priced at $349 found 4 days ago
American Airlines
Thu, Mar 26 - Thu, Apr 2
DCA
Washington
SUN
Sun Valley
$354 Roundtrip, found 3 days ago
$354
Roundtrip
found 3 days ago
Select American Airlines flight, departing Thu, Mar 26 from Washington to Sun Valley, returning Thu, Apr 2, priced at $354 found 3 days ago
Delta
Thu, May 7 - Tue, May 12
DCA
Washington
SUN
Sun Valley
$354 Roundtrip, found 6 days ago
$354
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, May 7 from Washington to Sun Valley, returning Tue, May 12, priced at $354 found 6 days ago
United
Fri, Sep 11 - Wed, Sep 16
DCA
Washington
SUN
Sun Valley
$374 Roundtrip, found 2 days ago
$374
Roundtrip
found 2 days ago
Select United flight, departing Fri, Sep 11 from Washington to Sun Valley, returning Wed, Sep 16, priced at $374 found 2 days ago
United
Sun, Mar 29 - Fri, Apr 3
DCA
Washington
SUN
Sun Valley
$376 Roundtrip, found 4 days ago
$376
Roundtrip
found 4 days ago
Select United flight, departing Sun, Mar 29 from Washington to Sun Valley, returning Fri, Apr 3, priced at $376 found 4 days ago
United
Thu, Mar 26 - Thu, Apr 2
DCA
Washington
SUN
Sun Valley
$385 Roundtrip, found 3 days ago
$385
Roundtrip
found 3 days ago
Select United flight, departing Thu, Mar 26 from Washington to Sun Valley, returning Thu, Apr 2, priced at $385 found 3 days ago
United
Tue, Jan 5 - Sun, Jan 10
DCA
Washington
SUN
Sun Valley
$394 Roundtrip, found 4 days ago
$394
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jan 5 from Washington to Sun Valley, returning Sun, Jan 10, priced at $394 found 4 days ago
American Airlines
Tue, Jan 5 - Sun, Jan 10
DCA
Washington
SUN
Sun Valley
$419 Roundtrip, found 4 days ago
$419
Roundtrip
found 4 days ago
Select American Airlines flight, departing Tue, Jan 5 from Washington to Sun Valley, returning Sun, Jan 10, priced at $419 found 4 days ago

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Frequently asked questions

How much does a flight from Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN) cost?
Lock in a cheap one-way flight from $160 or cheap return flight from $329 from Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN) 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 Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN)?
The cheapest month to fly from DCA to SUN is January, when demand is low. Off-peak months are generally when better flight deals are available between these airports.
What is the cheapest airline that flies from Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN)?
To find the cheapest airline flying from DCA to SUN, use Expedia's filter tool. Tailor your search based on what's important to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN)?
There are no daily nonstop flights departing from Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN). But you can choose flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be on your way in no time at all.
What day of the week has the most flights from DCA to SUN?
Generally you'll have the most choice when it comes to flights on a Friday. Tuesdays are often the quietest.* But this can vary based on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN)?
To arrive at Friedman Memorial Airport (SUN) on time, choose a flight that takes off from Ronald Reagan Washington National Airport (DCA) before 3 PM. The chance 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 Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN) last-minute?
Last-minute fares from DCA to SUN are typically more expensive. To lock in the best rates, start searching for flights ahead of time. That said, if you're flexible with your travel dates, you may land a cheap ticket right before your trip.
Is it cheaper to book a DCA to SUN flight and hotel package?
Booking a DCA to SUN flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Pick from our wide range of stays and then add activities, car rentals and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ronald Reagan Washington National Airport (DCA) to Friedman Memorial Airport (SUN)?
Usually, it's possible to cancel or reschedule your DCA to SUN flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Ronald Reagan Washington National
Destination airport
Friedman Memorial
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Roundtrip price
$328
Distance
1947 mi

Book with confidence

Washington to Sun Valley Flights

The cheapest times to fly from Washington to Sun Valley

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

 

The best time to book a flight from Washington to Sun Valley

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

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 Sun Valley in 2026. You can also book with separate airlines for your outbound and return journeys, from $160 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 Sun Valley 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 Sun Valley 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 Sun Valley Flights

*Flight schedules are subject to change.

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