£150 Cheap Flights from Washington Dulles (IAD) to Seattle (SEAA)

Q: How many airports are there in Seattle?

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.

Q: How much are return flights from Washington Dulles to Seattle?

The best price we found for a return flight from Washington Dulles to Seattle is £150. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Q: How long does it take to fly from Washington Dulles to Seattle?

5 hours and 48 minutes is the average flight time from Washington Dulles to Seattle.

Q: Which airlines fly direct from Washington Dulles to Seattle?

United, Alaska Airlines and Air Tahiti Nui fly direct from Washington Dulles to Seattle.

Q: How many flights are there a week from Washington Dulles to Seattle?

As of April 2025, there are 192 flights per week flying from Washington Dulles to Seattle.

Q: When is the cheapest time to fly from Washington Dulles to Seattle?

The cheapest month to fly from Washington Dulles to Seattle is usually April 2025.

Q: Which is the cheapest airport to fly into in Seattle?

If you're flying from Washington Dulles Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 12.1 miles away from the centre of Seattle. We've found flights into this airport from £150 .

Q: Which upcoming date is cheapest to fly from Washington Dulles Airport to Seattle on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Seattle on Friday, 9 May 2025 .

Q: Can I get a direct flight from Washington Dulles Airport to Seattle?

Yes – the average flight time is 5 hours and 48 minutes.

Q: How can I get the best flight deal from Washington Dulles Airport to Seattle?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

Compare Washington Dulles to Seattle flight deals

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Flight deals from Washington Dulles to Seattle

Looking for a cheap last-minute deal or the best return flight from Washington Dulles to Seattle? Find the lowest prices on one-way and return tickets right here.

Seattle.£150 per passenger.Departing Fri, 9 May, returning Sun, 18 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Fri, 9 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Sun, 18 May, arriving in Washington Dulles.Price includes taxes and charges.From £150, select.

Seattle.£187 per passenger.Departing Sat, 31 May, returning Wed, 4 Jun.Return flight with Frontier Airlines and Spirit Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Sat, 31 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Spirit Airlines, departs from Seattle / Tacoma International on Wed, 4 Jun, arriving in Washington Dulles.Price includes taxes and charges.From £187, select.

Seattle.£191 per passenger.Departing Tue, 3 Jun, returning Wed, 11 Jun.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Tue, 3 Jun, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Wed, 11 Jun, arriving in Washington Dulles.Price includes taxes and charges.From £191, select.

Seattle.£193 per passenger.Departing Wed, 28 May, returning Tue, 3 Jun.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Wed, 28 May, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Tue, 3 Jun, arriving in Washington Dulles.Price includes taxes and charges.From £193, select.

Seattle.£193 per passenger.Departing Sat, 24 May, returning Sat, 31 May.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 24 May, arriving in Seattle / Tacoma International.Inbound direct flight with United departs from Seattle / Tacoma International on Sat, 31 May, arriving in Washington Dulles.Price includes taxes and charges.From £193, select.

Seattle.£223 per passenger.Departing Sat, 31 May, returning Thu, 14 Aug.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Sat, 31 May, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Thu, 14 Aug, arriving in Washington Dulles.Price includes taxes and charges.From £223, select.

Seattle.£245 per passenger.Departing Fri, 19 Sep, returning Sat, 27 Sep.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Washington Dulles on Fri, 19 Sep, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Sat, 27 Sep, arriving in Washington Dulles.Price includes taxes and charges.From £245, select.

Seattle.£246 per passenger.Departing Thu, 13 Nov, returning Mon, 17 Nov.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Washington Dulles on Thu, 13 Nov, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Mon, 17 Nov, arriving in Washington Dulles.Price includes taxes and charges.From £246, select.

Find the cheapest month to fly from Washington Dulles to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to Seattle flights are currently cheapest in May.

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Direct flights from Washington Dulles to Seattle

Alternative Washington Dulles to Seattle routes

Looking for the cheapest, fastest or easiest route from Washington Dulles to Seattle? You could fly into the following airports instead.

Washington D.C. to Seattle: Flight information

The things to know before you go.

Cheapest flight found	£150
Cheapest month to fly	May
Average flight time	5 hrs, 48 mins
Most popular airline	United
Average flights per week	196

Finding cheap flights from Washington Dulles to Seattle: Frequently asked questions

How many airports are there in Seattle?

How much are return flights from Washington Dulles to Seattle?

How long does it take to fly from Washington Dulles to Seattle?

Which airlines fly direct from Washington Dulles to Seattle?

How many flights are there a week from Washington Dulles to Seattle?

When is the cheapest time to fly from Washington Dulles to Seattle?

Which is the cheapest airport to fly into in Seattle?

Which upcoming date is cheapest to fly from Washington Dulles Airport to Seattle on?

Can I get a direct flight from Washington Dulles Airport to Seattle?

How can I get the best flight deal from Washington Dulles Airport to Seattle?

When is the best time to book flights to Seattle?

What’s the weather like in Seattle?

Which is the cheapest airline to fly from Washington Dulles Airport to Seattle with?

Travelling from Washington Dulles International Airport (IAD) to Seattle: what you need to know

Around 5 hours is how long you'll be travelling on a direct flight from Washington Dulles International Airport to Seattle.
Seattle is 3 hours behind Washington DC, where Washington Dulles International Airport is located. Seattle operates on the UTC-7 timezone.
With 58 weekly flights between the two airports, Washington Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA) is the busiest route. Alaska Airlines operates the earliest flight at 07:00. If you prefer to get more out of your day before flying, the last departure from IAD to SEA is with United at 22:15.
To ensure you get on your flight from IAD to Seattle, leave plenty of time to check in and drop off your luggage. Turning up two hours before international departures and one hour before domestic flights is the general rule.
Peak months like July or holiday periods such as summer and spring break will mean bigger waits at check-in and security. Play it safe and get to the airport even earlier. Arriving two hours before domestic flights and up four hours ahead of international flights is a smart idea.
You can book a nonstop flight from Washington Dulles International Airport to Seattle that arrives at Seattle-Tacoma International Airport (SEA).
There's a range of airlines operating direct flights from Washington Dulles International Airport to Seattle, including:
You don't need your passport or a visa to travel within United States. You will need a valid form of identification however, such as a driver's licence or an ID card. Put them on your packing checklist after booking your cheap tickets from Washington Dulles International Airport to Seattle.
Located around 35 miles from the centre of Washington DC, IAD can be reached in approximately 51 minutes by car, depending on traffic. The journey by public transport is roughly 3 hours and 26 minutes.
Planning to catch an early flight from Washington Dulles International Airport to Seattle? Avoid the last-minute rush to the terminal (and get some extra shut-eye) by picking one of these stays near IAD:

How to find the cheapest flights from Washington Dulles International Airport (IAD) to Seattle

The best price we've found for a one-way ticket from Washington Dulles International Airport to Seattle is £75. The cheapest price for a return flight is £150. Bear in mind fares can change due to demand at the time of booking.
To secure cheap tickets from IAD to Seattle, book your trip 10 months ahead of your planned departure.
Organise your trip for June. That's the cheapest month for tickets from Washington Dulles International Airport to Seattle. If you're flexible with your travel dates, use the 'Whole month' tool to see the cheapest price across each month.
Create a Price Alert for cheap tickets from IAD to Seattle. There's no need to search every day to see whether fares have dropped. We'll tell you as soon as the price changes.
Tailor your flights with filters. Choose your preferred departure and arrival times, airlines and total journey duration. You can also sort results by 'Best,' 'Fastest' or 'Cheapest' flights from Washington Dulles International Airport to Seattle.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

Seattle-Tacoma International Airport (SEA) to central Seattle is around 18 minutes by car. It's approximately 14 miles away.
If you're using public transport, expect a journey of about 54 minutes.
If you're coming in on a late flight from Washington Dulles International Airport to Seattle, few things beat the convenience of staying near the terminal. Grab your luggage from the carousel and then be showered and sleeping not long after at one of these accommodation options near SEA:

Lake Union Sea Plane Base Airport (LKE)

The centre of Seattle is located around 2 miles from Lake Union Sea Plane Base Airport (LKE). After your flight from Washington Dulles International Airport to Seattle has touched down and you've made your way to arrivals, expect a drive of around 11 minutes.
The trip will take roughly 23 minutes on public transport.
Hang the 'Do not disturb' sign on your door and rest at a hotel close to LKE. Here are a few options where you can take a load off after your flight from IAD to Seattle:

Best time to go to Seattle

July is the most popular month to hop on a flight from Washington Dulles International Airport to Seattle while May is the quietest. To work out the best time to visit Seattle, consider whether you like a lively atmosphere or a quieter vibe.
The warmest month in Seattle is August, with the temperature ranging between 12ºC and 28ºC. Book your flights from Washington Dulles International Airport to Seattle in this month if you enjoy this type of weather.
If you like cooler conditions, search for a cheap flight from IAD to Seattle in February when temperatures average between -1ºC and 11ºC.

More about Seattle

After locking in your flight from Washington Dulles International Airport to Seattle, think about where you want to stay in this city. Make one of these options your base for exploring Seattle:
Gas Works - Lake View Point and Queen Anne Bowl Playfield are a couple of major attractions to put on your Seattle must-do list. Keep the momentum going by heading to LMN Architects.

Complete your Seattle trip with a car rental

We use the same magic that helped you find your cheap flight from Washington Dulles International Airport to Seattle to track down awesome deals on car rentals. Search for your ride in seconds and easily compare your options. Plus we give you everything you need to know about car rentals in Seattle, from the most popular rental company to the best time to book.