Cheap Flight Tickets from Washington (IAD) to Seattle (SEA), Starting at $340

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

$460

DL Delta Airlines • 1 stop • 46h 45m

Sep 04 – Sep 12

The cheapest round trip flight from Washington to Seattle (IAD-SEA-IAD) is currently $460

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Cheapest One way Flight

$340

AA American Airlines • 1 stop • 30h 25m

Jul 18

The cheapest one way flight from Washington to Seattle (IAD-SEA) is currently $340

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Cheapest Direct Flight

$493

DL Delta Airlines • nonstop • 9h 5m

Sep 04

The cheapest nonstop flight from Washington to Seattle (IAD-SEA) is currently $493

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Fastest Flight

9h 5m

The fastest nonstop flight from Washington to Seattle (IAD-SEA) takes 9h 5m

Top Airlines Flying from Washington to Seattle

Delta Airline, DL

Delta Airlines

American Airlines, AA

American Airlines

United Airlines, UA

United Airlines

Alaska Airlines -AS

Alaska Airlines

Southwest Airlines-WN

Southwest Airlines

Sun Country Airlines (SY)

Sun Country Airlines

WestJet Airlines

WestJet 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.

Sep 04 - Sep 12, Economy
DL
Washington → Seattle
46h 45m
7:15 PM - 8:20 PM • 1 stop
DL
Washington → Seattle
15h 59m
7:15 AM - 8:14 PM • 1 stop
$460
Delta Airlines
Sep 04 - Sep 12, Economy
DL
Washington → Seattle
29h 18m
7:15 PM - 10:13 AM • 1 stop
DL
Washington → Seattle
8h 36m
11:45 AM - 8:01 PM • nonstop
$513
Delta Airlines
Sep 04 - Sep 12, Economy
DL
Washington → Seattle
17h 12m
8:28 AM - 4:00 PM • 1 stop
DL
Washington → Seattle
13h 52m
11:59 PM - 11:31 AM • 1 stop
$774
Delta Airlines
Sep 04 - Sep 12, Economy
DL
Washington → Seattle
15h 17m
8:28 AM - 2:45 PM • 1 stop
DL
Washington → Seattle
13h 52m
11:59 PM - 11:31 AM • 1 stop
$871
Delta Airlines
Sep 04 - Sep 12, Economy
DL
Washington → Seattle
17h 33m
12:30 PM - 8:23 PM • 1 stop
DL
Washington → Seattle
13h 52m
11:59 PM - 11:31 AM • 1 stop
$871
Delta Airlines
Sep 04 - Sep 12, Economy
DL
Washington → Seattle
13h 20m
6:00 AM - 11:00 AM • 1 stop
DL
Washington → Seattle
13h 44m
11:59 AM - 11:23 PM • 1 stop
$927
Delta 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 6:00 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 F9 : USD 879
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 11:000 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

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