$170 Cheap Flights from Sun Valley (SUN) to Washington (IAD)

View $170 flight on Wed, Feb 25, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $170 for one-way flights and $341 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Jan 15 - Mon, Jan 19
SUN
Sun Valley
IAD
Washington
$341 Roundtrip, found 4 days ago
$341
Roundtrip
found 4 days ago
Select Delta flight, departing Thu, Jan 15 from Sun Valley to Washington, returning Mon, Jan 19, priced at $341 found 4 days ago
United
Thu, Jan 15 - Mon, Jan 19
SUN
Sun Valley
IAD
Washington
$341 Roundtrip, found 4 days ago
$341
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jan 15 from Sun Valley to Washington, returning Mon, Jan 19, priced at $341 found 4 days ago
Delta
Sat, Dec 6 - Thu, Dec 11
SUN
Sun Valley
IAD
Washington
$352 Roundtrip, found 6 days ago
$352
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, Dec 6 from Sun Valley to Washington, returning Thu, Dec 11, priced at $352 found 6 days ago
United
Sat, Dec 6 - Thu, Dec 11
SUN
Sun Valley
IAD
Washington
$357 Roundtrip, found 6 days ago
$357
Roundtrip
found 6 days ago
Select United flight, departing Sat, Dec 6 from Sun Valley to Washington, returning Thu, Dec 11, priced at $357 found 6 days ago
United
Thu, Jan 15 - Mon, Jan 19
SUN
Sun Valley
IAD
Washington
$368 Roundtrip, found 4 days ago
$368
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jan 15 from Sun Valley to Washington, returning Mon, Jan 19, priced at $368 found 4 days ago
Delta
Tue, Dec 2 - Sat, Dec 6
SUN
Sun Valley
IAD
Washington
$380 Roundtrip, found 5 days ago
$380
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Dec 2 from Sun Valley to Washington, returning Sat, Dec 6, priced at $380 found 5 days ago
Delta
Wed, Dec 3 - Thu, Dec 4
SUN
Sun Valley
IAD
Washington
$385 Roundtrip, found 5 days ago
$385
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Dec 3 from Sun Valley to Washington, returning Thu, Dec 4, priced at $385 found 5 days ago
Hawaiian Airlines
Wed, Dec 24 - Thu, Jan 1
SUN
Sun Valley
IAD
Washington
$421 Roundtrip, found 6 days ago
$421
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Wed, Dec 24 from Sun Valley to Washington, returning Thu, Jan 1, priced at $421 found 6 days ago
Alaska Airlines
Wed, Dec 3 - Sat, Dec 6
SUN
Sun Valley
IAD
Washington
$442 Roundtrip, found 5 days ago
$442
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Dec 3 from Sun Valley to Washington, returning Sat, Dec 6, priced at $442 found 5 days ago
American Airlines
Tue, Dec 23 - Mon, Dec 29
SUN
Sun Valley
IAD
Washington
$749 Roundtrip, found 6 days ago
$749
Roundtrip
found 6 days ago
Select American Airlines flight, departing Tue, Dec 23 from Sun Valley to Washington, returning Mon, Dec 29, priced at $749 found 6 days ago

Alternative airports near Washington

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

Select flight to Ronald Reagan Washington National DCA. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $390
DCA
Ronald Reagan Washington National
CheapestClosest
Average driving time to city center8 min
Flights from $390
Flights from Sun Valley (SUN) to Washington (IAD)
Origin airport
Friedman Memorial
Destination airport
Washington Dulles Intl.
Roundtrip price
$340
Distance
1924 mi

Sun Valley to Washington Flights

The cheapest times to fly from Sun Valley to Washington

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

 

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

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

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 Sun Valley to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $170 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 Sun Valley to Washington 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 Sun Valley to Washington 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 Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD) cost?
Secure a cheap one-way flight from $170 or cheap return flight from $341 from Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD) 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 Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD)?
The cheapest month to fly from SUN to IAD is January, when there's less demand. Off-peak season is generally when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD)?
To find the cheapest airline flying from SUN to IAD, use Expedia's filter tool. Tailor 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 see the most affordable options first.
How many flights per day from Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD)?
There aren't any daily nonstop flights departing from Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD). But you can opt for flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from SUN to IAD?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD)?
To reach Washington Dulles Intl. Airport (IAD) on time, book a flight that leaves from Friedman Memorial Airport (SUN) before 3 PM. The likelihood 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 Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD) last-minute?
Booking your plane ticket from SUN to IAD shortly before your journey is usually more expensive. But if you're flexible with your departure dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a SUN to IAD flight and hotel package?
You can save money by booking a SUN to IAD flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. After selecting your ideal accommodations and flights, consider adding extras including activities, car rentals and tours.
Can I cancel or change the date of my flight from Friedman Memorial Airport (SUN) to Washington Dulles Intl. Airport (IAD)?
It's generally possible to reschedule or cancel your SUN to IAD flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.