Cheap Flight Tickets from Washington (IAD) to Seattle (SEA), Starting at $1032

Good to Know: Cheapest and Fastest IAD - SEA Flights

Useful information for finding best airline tickets from Washington Dulles International to Seattle Tacoma International on your next trip.

Cheapest Round Trip Flight

$1032

AS Alaska Airlines • nonstop • 9h 7m

Aug 30 – Sep 02

The cheapest round trip flight from Washington to Seattle (IAD-SEA-IAD) is currently $1032

🔍 Search Flights

Cheapest Direct Flight

$1032

AS Alaska Airlines • nonstop • 9h 7m

Aug 30

The cheapest nonstop flight from Washington to Seattle (IAD-SEA) is currently $1032

🔍 Search Flights

Fastest Flight

8h 56m

The fastest nonstop flight from Washington to Seattle (IAD-SEA) takes 8h 56m

Top Airlines Flying from Washington to Seattle

Delta Airline, DL

Delta Airlines

American Airlines, AA

American Airlines

Alaska Airlines -AS

Alaska Airlines

United Airlines, UA

United Airlines

Latest Flight Deals from Washington (IAD) to Seattle (SEA)

Compare and book low fare round-trip air tickets from Washington to Seattle. Ideal for travelers with confirmed return itineraries.

Aug 30 - Sep 02, Economy
AS
Washington → Seattle
9h 7m
5:47 PM - 8:34 PM • nonstop
AS
Washington → Seattle
8h 27m
10:23 PM - 6:30 AM • nonstop
$1032
Alaska Airlines
Aug 30 - Aug 30, Economy
AS
Washington → Seattle
8h 56m
9:03 AM - 11:39 AM • nonstop
AA
Washington → Seattle
8h 23m
3:56 PM - 11:59 PM • nonstop
$1127
Alaska Airlines
Aug 30 - Aug 30, Economy
AA
Washington → Seattle
8h 57m
7:00 AM - 9:37 AM • nonstop
AS
Washington → Seattle
8h 23m
3:56 PM - 11:59 PM • nonstop
$1127
American Airlines
Aug 30 - Aug 30, Economy
AA
Washington → Seattle
8h 56m
9:03 AM - 11:39 AM • nonstop
AS
Washington → Seattle
8h 23m
3:56 PM - 11:59 PM • nonstop
$1127
American Airlines
Aug 30 - Aug 30, Economy
DL
Washington → Seattle
9h 5m
7:10 AM - 9:55 AM • nonstop
DL
Washington → Seattle
8h 21m
3:58 PM - 11:59 PM • nonstop
$1202
Delta Airlines
Aug 30 - Aug 30, Economy
AS
Washington → Seattle
8h 57m
7:00 AM - 9:37 AM • nonstop
AS
Washington → Seattle
8h 23m
3:56 PM - 11:59 PM • nonstop
$1227
Alaska Airlines

Fly from Washington to Seattle with the Best Airfare Deals on FareLeaders

Looking for a cheap last-minute deal or the best round-trip flight from Washington to Seattle? Find the biggest savings on one-way and round-trip tickets right here.

FAQs on Washington to Seattle Flights

What are the airports in Washington?
IAD,BWI,DCA
What’s the most popular airline flying from IAD to SEA?
The most popular airline flying from Washington to Seattle are
Can I fly from IAD to SEA non-stop?
Yes, you can fly IAD to SEA non-stop on
Which airlines fly nonstop between Washington and Seattle?
The non-stop flights between Washington and Seattle are .
What’s the earliest departure time from IAD to SEA Airport?
The earliest flight leaves IAD at 7:00 am and lands in SEA - Seattle Tacoma International
What are the airports in Seattle?
SEA
Can I make changes to my Washington to Seattle flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from IAD to SEA?
Read the fare rules of the Washington to Seattle air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Washington and Seattle?
operate flights between Washington and Seattle
How long does a flight from Washington to Seattle take?
It takes approximately 5 hour to fly non-stop from IAD to SEA, which is 2305.73 miles by air.
Which airlines provide the cheapest flights from Washington (IAD) to Seattle (SEA) ?
In the past couple of days, the cheapest tickets to SEA from IAD were found on AS : USD 1227
Do I need a passport to fly between IAD and SEA?
No
What’s the latest departure time from IAD to SEA ?
The last flight leaves IAD at 5:47 pm

Washington (IAD) to Seattle (SEA): Airport Information

Origin Airport Washington Dulles International , Washington, US
Destination Airport Seattle Tacoma International , Seattle, US
Distance 2306 miles

More Flight Options for Washington (IAD) and Seattle (SEA)

Why Fareleaders for IAD to SEA Plane Tickets

Lowest Prices
Lowest Prices
Uncover the best deals on Washington to Seattle flights by comparing fares from hundreds of airlines and agencies.
New Deals
New Deals Everyday
Get the best prices on IAD to SEA flights—we update our fares daily so you never miss a saving.
Best Travel Options
No Service Fees
Compare hundreds of Washington to Seattle flights and secure the best deals—we never add any service fees.
Get Fare Drop Alert
Be the first to know when fares drop for the Washington (IAD) to Seattle (SEA)
Terms and Conditions*