$171 Cheap Flights from Washington (IAD) to Sun Valley (SUN)

View $171 flight on Sat, Feb 28, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Sun Valley, ID (SUN-Friedman Memorial)

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

Prices were available within the past 7 days and start at $171 for one-way flights and $341 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Jan 20 - Sat, Jan 24
IAD
Washington
SUN
Sun Valley
$341 Roundtrip, found 2 days ago
$341
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Jan 20 from Washington to Sun Valley, returning Sat, Jan 24, priced at $341 found 2 days ago
United
Tue, Jan 20 - Sat, Jan 24
IAD
Washington
SUN
Sun Valley
$341 Roundtrip, found 2 days ago
$341
Roundtrip
found 2 days ago
Select United flight, departing Tue, Jan 20 from Washington to Sun Valley, returning Sat, Jan 24, priced at $341 found 2 days ago
Delta
Thu, Jan 8 - Fri, Jan 9
IAD
Washington
SUN
Sun Valley
$346 Roundtrip, found 2 days ago
$346
Roundtrip
found 2 days ago
Select Delta flight, departing Thu, Jan 8 from Washington to Sun Valley, returning Fri, Jan 9, priced at $346 found 2 days ago
Alaska Airlines
Tue, Jan 20 - Sat, Jan 24
IAD
Washington
SUN
Sun Valley
$349 Roundtrip, found 2 days ago
$349
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Jan 20 from Washington to Sun Valley, returning Sat, Jan 24, priced at $349 found 2 days ago
American Airlines
Mon, Jan 5 - Sat, Jan 10
IAD
Washington
SUN
Sun Valley
$351 Roundtrip, found 2 days ago
$351
Roundtrip
found 2 days ago
Select American Airlines flight, departing Mon, Jan 5 from Washington to Sun Valley, returning Sat, Jan 10, priced at $351 found 2 days ago
United
Wed, Dec 31 - Mon, Jan 5
IAD
Washington
SUN
Sun Valley
$357 Roundtrip, found 5 days ago
$357
Roundtrip
found 5 days ago
Select United flight, departing Wed, Dec 31 from Washington to Sun Valley, returning Mon, Jan 5, priced at $357 found 5 days ago
Delta
Wed, Feb 11 - Sun, Feb 15
IAD
Washington
SUN
Sun Valley
$370 Roundtrip, found 2 days ago
$370
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Feb 11 from Washington to Sun Valley, returning Sun, Feb 15, priced at $370 found 2 days ago
Delta
Wed, Jan 7 - Mon, Jan 12
IAD
Washington
SUN
Sun Valley
$375 Roundtrip, found 2 days ago
$375
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Jan 7 from Washington to Sun Valley, returning Mon, Jan 12, priced at $375 found 2 days ago
United
Sat, Nov 15 - Sat, Nov 22
IAD
Washington
SUN
Sun Valley
$380 Roundtrip, found 3 days ago
$380
Roundtrip
found 3 days ago
Select United flight, departing Sat, Nov 15 from Washington to Sun Valley, returning Sat, Nov 22, priced at $380 found 3 days ago
Hawaiian Airlines
Mon, Feb 23 - Sat, Feb 28
IAD
Washington
SUN
Sun Valley
$391 Roundtrip, found 3 days ago
$391
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Mon, Feb 23 from Washington to Sun Valley, returning Sat, Feb 28, priced at $391 found 3 days ago
Flights from Washington (IAD) to Sun Valley (SUN)
Origin airport
Washington Dulles Intl.
Destination airport
Friedman Memorial
Airlines serving
Alaska Airlines, Delta, United
Roundtrip price
$340
Distance
1924 mi

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 2025. You can also book with separate airlines for your outbound and return journeys, from $171 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.

 

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN) cost?
Get a cheap one-way flight from $171 or cheap return flight from $341 from Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN) 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 Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN)?
Planning your trip for January can help you save, as it's the cheapest month for flights between IAD and SUN. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN)?
Expedia's filter tool lets you easily compare different airlines, flight durations and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest IAD to SUN flight.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN)?
There aren't any daily nonstop flights available from Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN). But you can book flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way in no time.
What day of the week has the most flights from IAD to SUN?
Generally you'll have the most choice when it comes to flights on a Friday. Tuesdays are often the quietest.* However, this can vary depending on the season, 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 Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN)?
To avoid possible delays on the Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN) route, travel before 3 PM. Flights after this time are 22% more likely to be canceled.**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 Friedman Memorial Airport (SUN) last-minute?
Last-minute bookings from IAD to SUN are usually more expensive. To lock in the best prices, start searching for flights as soon as possible. That being said, if you're flexible with your travel dates, it's possible to land a cheap fare right before you leave.
Is it cheaper to book an IAD to SUN flight and hotel package?
Compared with arranging flights and hotels separately, booking an IAD to SUN flight and hotel package with Expedia could result in significant savings. Better still, having everything in one easy place takes the hassle out of travel planning. Just pick your flights and choose from our wide range of stays, then personalize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Friedman Memorial Airport (SUN)?
In most instances, you're able to reschedule or cancel your IAD to SUN flight. However, there may be additional fees, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you want further information, visit our Customer Service portal.

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*Available to One Key members.