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188 € Cheap Flights from Washington Dulles to Seattle

Compare Washington Dulles to Seattle flight deals

Find the cheapest month or even day of the year to fly to Seattle

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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 Airport to Seattle? If you want to travel next month, return fares start from 226 €. Find the lowest prices on one-way and return tickets right here.
Seattle.188 € per passenger.Departing Fri, 5 Jun, returning Mon, 8 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Fri, 5 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Mon, 8 Jun, arriving in Washington Dulles.Price includes taxes and charges.From 188 €, select.
Seattle.209 € per passenger.Departing Mon, 17 Aug, returning Tue, 25 Aug.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Mon, 17 Aug, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Tue, 25 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 209 €, select.
Seattle.209 € per passenger.Departing Sat, 6 Jun, returning Fri, 12 Jun.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Sat, 6 Jun, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Fri, 12 Jun, arriving in Washington Dulles.Price includes taxes and charges.From 209 €, select.
Seattle.209 € per passenger.Departing Tue, 8 Sep, returning Tue, 15 Sep.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Tue, 8 Sep, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Tue, 15 Sep, arriving in Washington Dulles.Price includes taxes and charges.From 209 €, select.
Seattle.212 € per passenger.Departing Sat, 29 Aug, returning Tue, 1 Sep.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 29 Aug, arriving in Seattle / Tacoma International.Inbound direct flight with United departs from Seattle / Tacoma International on Tue, 1 Sep, arriving in Washington Dulles.Price includes taxes and charges.From 212 €, select.
Seattle.216 € per passenger.Departing Thu, 28 May, returning Thu, 4 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Thu, 28 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Thu, 4 Jun, arriving in Washington Dulles.Price includes taxes and charges.From 216 €, select.
Seattle.218 € per passenger.Departing Wed, 22 Jul, returning Fri, 24 Jul.Return flight with United.Outbound indirect flight with United, departs from Washington Dulles on Wed, 22 Jul, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Fri, 24 Jul, arriving in Washington Dulles.Price includes taxes and charges.From 218 €, select.
Seattle.226 € per passenger.Departing Mon, 4 May, returning Sat, 23 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Mon, 4 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Sat, 23 May, arriving in Washington Dulles.Price includes taxes and charges.From 226 €, select.
Seattle.229 € per passenger.Departing Tue, 21 Jul, returning Thu, 30 Jul.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Tue, 21 Jul, arriving in Seattle / Tacoma International.Inbound direct flight with United departs from Seattle / Tacoma International on Thu, 30 Jul, arriving in Washington Dulles.Price includes taxes and charges.From 229 €, select.
Seattle.237 € per passenger.Departing Tue, 28 Jul, returning Fri, 7 Aug.Return flight with United.Outbound indirect flight with United, departs from Washington Dulles on Tue, 28 Jul, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Fri, 7 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 237 €, select.
Seattle.247 € per passenger.Departing Thu, 28 May, returning Thu, 4 Jun.Return flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Washington Dulles on Thu, 28 May, arriving in Seattle / Tacoma International.Inbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Thu, 4 Jun, arriving in Washington Dulles.Price includes taxes and charges.From 247 €, select.
Seattle.249 € per passenger.Departing Mon, 25 May, returning Wed, 26 Aug.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Mon, 25 May, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Wed, 26 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 249 €, select.
Seattle.260 € per passenger.Departing Fri, 26 Jun, returning Wed, 1 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Fri, 26 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with Frontier Airlines, departs from Seattle / Tacoma International on Wed, 1 Jul, arriving in Washington Dulles.Price includes taxes and charges.From 260 €, select.
Seattle.267 € per passenger.Departing Mon, 29 Jun, returning Fri, 7 Aug.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Mon, 29 Jun, arriving in Seattle / Tacoma International.Inbound direct flight with United departs from Seattle / Tacoma International on Fri, 7 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 267 €, select.
Seattle.274 € per passenger.Departing Wed, 30 Sep, returning Sat, 3 Oct.Return flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Wed, 30 Sep, arriving in Seattle / Tacoma International.Inbound direct flight with Delta departs from Seattle / Tacoma International on Sat, 3 Oct, arriving in Washington Dulles.Price includes taxes and charges.From 274 €, select.
Seattle.274 € per passenger.Departing Mon, 4 May, returning Sat, 23 May.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Mon, 4 May, arriving in Seattle / Tacoma International.Inbound direct flight with United departs from Seattle / Tacoma International on Sat, 23 May, arriving in Washington Dulles.Price includes taxes and charges.From 274 €, 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 June.
Apr
from 312 €
May
from 226 €
Jun
from 188 €
Jul
from 218 €
Aug
from 209 €
Sep
from 209 €
Oct
from 338 €
Nov
from 344 €
Dec
Find prices
Jan
Find prices
Feb
Find prices
Mar
from 348 €

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.

Seattle Lake Union SPB

2km from central Seattle
Closest
from 737 €
Search flights

Seattle Boeing Fld

11km from central Seattle
from 929 €
Search flights

Seattle / Tacoma International

20km from central Seattle
Cheapest
from 188 €
Search flights

Paine Field

33km from central Seattle
from 1.037 €
Search flights

Washington D.C. to Seattle: Flight information

The things to know before you go.
Cheapest flight found94 €
Cheapest month to flyJune
Average flight time5 hrs, 49 mins
Most popular airlineAlaska Airlines
Average flights per week185

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

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Washington Dulles to Seattle is 188 €. 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.
5 hours and 49 minutes is the average flight time from Washington Dulles to Seattle.
Alaska Airlines, United and American Airlines fly direct from Washington Dulles to Seattle.
As of April 2026, there are 185 flights per week flying from Washington Dulles to Seattle.
The cheapest month to fly from Washington Dulles to Seattle is usually June.
If you're flying from Washington Dulles Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from 188 €.
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, 5 June 2026.
Yes – the average flight time is 5 hours and 49 minutes.
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.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In April, the average temperature is usually around 8°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, Frontier Airlines and Delta offer the cheapest flight tickets to Seattle.

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

  • Jump on a direct flight from Washington Dulles International Airport to Seattle and you'll be travelling for an average of 5 hours.

  • Washington Dulles International Airport is located in Washington DC. Based in the UTC-8 timezone, Seattle is three hours behind Washington DC.

  • Washington Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA) is the most traveled route, with 37 weekly flights to pick from. If you prefer starting your day later, the last flight from IAD to SEA is with United Airlines at 22:14. Opt for the first departure operated by Alaska Airlines at 06:30 if you want to get on your way earlier.

  • For hassle-free travel, arrive at the airport two hours ahead of international flights and one hour before domestic departures. This ensures you have enough time to board your IAD to Seattle flight.

  • Travelling during a peak month such as June? Public holidays and other popular seasons can lead to longer lines at check-in and security. Be extra cautious and get there up to four hours before an international flight and two hours before a domestic departure.

  • Start your trip at IAD and travel nonstop to Seattle-Tacoma International Airport (SEA). That's where you can expect to land when searching for Washington Dulles International Airport to Seattle tickets.

  • You can choose from a variety of carriers that offer direct flights from Washington Dulles International Airport to Seattle, including:

  • The journey from central Washington DC to IAD takes about 1 hour 10 minutes on public transport. If you drive, ride-share or grab a taxi, you'll cover the 40 kilometres in 45 minutes or so, depending on traffic.

  • Booked an early flight from Washington Dulles International Airport to Seattle? Avoid the stress of rushing to the airport (and catch some extra z's) by choosing one of these stays near IAD:

  • 77% of flights that leave from Washington Dulles International Airport land at their destination on time.

  • You'll find IAD at 1 Saarinen Circle.

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

  • 94 € is the cheapest price we've seen for a one-way Washington Dulles International Airport to Seattle flight. A round-trip ticket right now is 188 €. Depending on how early you book and the availability, these fares may change.

  • Book one month before you travel. Pricing trends suggest that this is the ideal window for finding cheap flights from IAD to Seattle.

  • Plan your trip for June. That's the best month for landing an awesome deal on Washington Dulles International Airport to Seattle tickets. If you're flexible with your travel dates, use the 'Whole month' tool to access the cheapest price across every month.

  • You don't need to keep checking in to see if fares have dropped when you create a Price Alert. We'll let you know the moment there's an updated deal for cheap flights from IAD to Seattle.

  • Save money on your flight from Washington Dulles International Airport to Seattle with the help of our filters. Choose your ideal departure time, duration and airlines, then sort the results by 'Cheapest' to see the best deals.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) to the centre of Seattle takes around 25 minutes by car. The centre is roughly 23 kilometres away.

  • If you're travelling by public transport, expect a journey time of around 35 minutes.

  • If you're arriving on a late flight from Washington Dulles International Airport to Seattle, nothing beats the convenience of staying near the terminal. Grab your luggage from the carousel and then be showered and sleeping soon after at one of these hotels near SEA:

  • Reserving your vehicle from Seattle-Tacoma International Airport about one week ahead of your flight from IAD to Seattle can help you get the lowest rate.

Seattle Paine Field International Airport (PAE)

  • Seattle Paine Field International Airport (PAE) is roughly 40 kilometres from central Seattle. After your flight from Washington Dulles International Airport to Seattle, it'll take you around 40 minutes to get to the heart of the city in a ride-share or taxi.

  • If you travel by public transport, you'll get to the city centre in 1 hour 30 minutes or so.

  • After stepping off your IAD to Seattle flight, settle in at a hotel near PAE. These are some comfortable accommodation options that'll help you slip into relaxation mode:

  • Avoid the slow-moving lines and paperwork at the rental desk by completing your booking beforehand. Secure your ride from PAE in advance so you can just grab the keys and be on your way.

King County International Airport (BFI)

  • Hop off your flight from Washington Dulles International Airport to Seattle and head straight for your hotel or jump right into exploring. The centre of Seattle is around 11 kilometres from King County International Airport (BFI) and typically takes 20 minutes to reach driving.

  • If you travel by public transport, expect a journey of about 35 minutes.

  • If you don't want to travel into the centre, choose a hotel close to BFI. Get comfortable at one of these options after your IAD to Seattle flight:

  • Rental providers sometimes offer deals on early bookings, so secure your ride from BFI a few weeks ahead of your flight from Washington Dulles International Airport to Seattle. A little planning can save you money.

Best time to go to Seattle

  • It's time to plan your travel dates for your flight from Washington Dulles International Airport to Seattle. July is the busiest month to travel to Seattle. If you like a quieter vibe, go in December.

  • Lock in a Washington Dulles International Airport to Seattle plane ticket with a departure in August if you want to visit the city during its warmest month. Expect temperatures to range from 12ºC (54ºF) to 28ºC (82ºF).

  • If you'd rather travel in cooler conditions, look for a cheap ticket from IAD to Seattle in February when temperatures average between -1ºC (30ºF) and 11ºC (52ºF).

More about Seattle

  • Start your Seattle trip off on the right foot by choosing the perfect place to stay. After booking your flight from Washington Dulles International Airport to Seattle, explore our range of accommodation options including:

  • Every great holiday has to include a little sightseeing. Pike Place Market, Space Needle and Seattle Skyline are essential stops on your Seattle itinerary.

Explore more of the United States

  • Seattle is easy to fall in love with, but there are so many other parts of the United States just waiting to be explored. About 241 kilometres south of Seattle, a visit to Portland will keep your itinerary packed. Start with leading attractions like Portland Japanese Garden, Peninsula Park Rose Garden and Beyond Van Gogh Portland.

  • Around 370 kilometres east of Seattle, Spokane is another essential stop in the United States. No visit is complete without checking out Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.

Plan the rest of your trip from Washington D.C. to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.