£162 Cheap Delta flights from Washington to Seattle (IAD→SEA)

View £162 flight on Wed, 29 Jul 2026Opens in a new window

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Delta flights from Washington to Seattle (IAD→SEA)

Prices were available within the past 7 days and start at £162 for one-way flights and £189 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, 24 Jun - Wed, 8 Jul
IAD
Washington
SEA
Seattle
£189 Return, found 5 days ago
£189
Return
found 5 days ago
Select Delta flight, departing Wed, 24 Jun from Washington to Seattle, returning Wed, 8 Jul, priced at £189 found 5 days ago
Delta
Fri, 31 Jul - Wed, 5 Aug
IAD
Washington
SEA
Seattle
£222 Return, found 5 days ago
£222
Return
found 5 days ago
Select Delta flight, departing Fri, 31 Jul from Washington to Seattle, returning Wed, 5 Aug, priced at £222 found 5 days ago
Delta
Thu, 2 Jul - Thu, 16 Jul
IAD
Washington
SEA
Seattle
£226 Return, found 1 day ago
£226
Return
found 1 day ago
Select Delta flight, departing Thu, 2 Jul from Washington to Seattle, returning Thu, 16 Jul, priced at £226 found 1 day ago
Delta
Sun, 19 Jul - Tue, 21 Jul
IAD
Washington
SEA
Seattle
£241 Return, found 1 day ago
£241
Return
found 1 day ago
Select Delta flight, departing Sun, 19 Jul from Washington to Seattle, returning Tue, 21 Jul, priced at £241 found 1 day ago
Delta
Wed, 30 Sept - Sat, 17 Oct
IAD
Washington
SEA
Seattle
£245 Return, found 5 days ago
£245
Return
found 5 days ago
Select Delta flight, departing Wed, 30 Sept from Washington to Seattle, returning Sat, 17 Oct, priced at £245 found 5 days ago
Delta
Tue, 22 Sept - Sun, 11 Oct
IAD
Washington
SEA
Seattle
£248 Return, found 1 day ago
£248
Return
found 1 day ago
Select Delta flight, departing Tue, 22 Sept from Washington to Seattle, returning Sun, 11 Oct, priced at £248 found 1 day ago
Delta
Sun, 21 Jun - Fri, 10 Jul
IAD
Washington
SEA
Seattle
£255 Return, found 5 days ago
£255
Return
found 5 days ago
Select Delta flight, departing Sun, 21 Jun from Washington to Seattle, returning Fri, 10 Jul, priced at £255 found 5 days ago
Delta
Fri, 12 Jun - Tue, 30 Jun
IAD
Washington
SEA
Seattle
£256 Return, found 5 days ago
£256
Return
found 5 days ago
Select Delta flight, departing Fri, 12 Jun from Washington to Seattle, returning Tue, 30 Jun, priced at £256 found 5 days ago

Alternative airports near Seattle

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

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city centre is 20 minutes. Flights from £366
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city centre20 min
Flights from £366

Find the cheapest month to fly from Washington (IAD) to Seattle (SEA)

July is typically the cheapest month to fly

From £171 - £304 per traveller.

Frequently asked questions

How much is a Delta Air Lines flight from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)?
Set the "Price (lowest to highest)" filter on Expedia to search for cheap Delta Air Lines return flights from £189 from IAD to SEA. Affordable one-way options from £162 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from IAD to SEA with Delta Air Lines?
Delta Air Lines flights to Seattle are generally more affordable in the quieter months of January and February. Whether you need a round-trip or one-way ticket, you could land a better deal then.
Does Delta Air Lines fly nonstop from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)?
You can easily fly from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA) on one of Delta Air Lines's 7 direct weekly flights. Apply our "Nonstop" and "Airline" filters to find the Delta Air Lines flight that'll arrive at SEA at a time that suits you.
How long does it take to fly from IAD to SEA with Delta Air Lines?
On average, it takes 6h 1m to travel nonstop from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA) with Delta Air Lines.
What airports does Delta Air Lines fly into in Seattle?
Seattle - Tacoma Intl. Airport (SEA) is the primary Seattle hub for Delta Air Lines flights from Washington Dulles Intl. Airport (IAD).
What type of plane does Delta Air Lines fly from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)?
You'll probably catch an Airbus A220-300 for your Delta Air Lines flight from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA). However, you may be switched to a different aircraft if there are operational changes.
Can I change or cancel my Delta Air Lines flight from Washington Dulles Intl. Airport (IAD) to Seattle - Tacoma Intl. Airport (SEA)?
Depending on the ticket type you purchased, a fee generally applies if you modify or cancel your flight more than 24 hours after confirmation. To find plane tickets with more flexibility, select our "No cancel fee" or "Changes included" filter when looking for flights. For more information on changing or cancelling your reservation, go to "Trips," select your flight and click on "Manage Booking."

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Popular airline
Alaska Airlines
Distance
3679 km
Average flight time
3 hours 47 mins

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