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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

Book the best Seattle fare with no extra fees

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.Rs29,321 per passenger.Departing Wed, 19 Nov.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Wed, 19 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs29,321, select.
Seattle.Rs29,321 per passenger.Departing Wed, 22 Oct.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Wed, 22 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs29,321, select.
Seattle.Rs29,321 per passenger.Departing Tue, 9 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Tue, 9 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs29,321, select.
Seattle.Rs29,489 per passenger.Departing Wed, 21 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Washington Dulles on Wed, 21 Jan, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs29,489, select.
Seattle.Rs29,797 per passenger.Departing Wed, 21 Jan.One-way flight with Hawaiian Airlines.Outbound direct flight with Hawaiian Airlines departs from Washington Dulles on Wed, 21 Jan, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs29,797, select.
Seattle.Rs30,197 per passenger.Departing Wed, 5 Nov.One-way flight with Hawaiian Airlines.Outbound direct flight with Hawaiian Airlines departs from Washington Dulles on Wed, 5 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs30,197, select.
Seattle.Rs30,815 per passenger.Departing Tue, 9 Dec.One-way flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Tue, 9 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs30,815, select.
Seattle.Rs30,815 per passenger.Departing Sat, 18 Oct.One-way flight with Delta.Outbound direct flight with Delta departs from Washington Dulles on Sat, 18 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From Rs30,815, 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 October.
Sep
from Rs81,570
Oct
from Rs29,321
Nov
from Rs29,321
Dec
from Rs29,321
Jan
from Rs29,489
Feb
from Rs30,990
Mar
from Rs41,689
Apr
from Rs49,334
May
from Rs54,381
Jun
from Rs52,920
Jul
from Rs52,507
Aug
from Rs52,920

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 foundRs29,321
Cheapest month to flyOctober
Average flight time5 hrs, 51 mins
Most popular airlineAlaska Airlines
Average flights per week162

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 Rs49,909. 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 51 minutes is the average flight time from Washington Dulles to Seattle.
Alaska Airlines, Hawaiian Airlines and American Airlines fly direct from Washington Dulles to Seattle.
As of September 2025, there are 162 flights per week flying from Washington Dulles to Seattle.
The cheapest month to fly from Washington Dulles to Seattle is usually October.
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 Rs49,909.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to Seattle on Saturday, 25 October 2025.
Yes – the average flight time is 5 hours and 51 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 September, the average temperature is usually around 15°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, Hawaiian Airlines offers the cheapest flight tickets to Seattle.

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

  • Expect to be in the air for 5 hours. On average, that's the time it takes for a direct flight from Washington Dulles International Airport to Seattle.

  • Seattle is three hours behind Washington DC, where Washington Dulles International Airport is located. Seattle observes the UTC-7 timezone.

  • The most popular route is from Washington Dulles International Airport (IAD) to Seattle-Tacoma International Airport (SEA). You can choose from 40 services every week between these two airports. If you'd like to take off as soon as possible, the earliest flight from IAD to SEA is the 06:30 Alaska Airlines service. If you prefer travelling later, the last departure is at 22:14 with United Airlines.

  • To avoid missing your IAD to Seattle flight, leave plenty of time for things like check-in and baggage drop. Arriving two hours ahead of international departures and an hour before domestic flights is the general rule.

  • If you're travelling during a major holiday or another peak period, allow extra time. A good general rule is two hours ahead of domestic flights and up to four hours before international departures. Queues at check-in and security will be longer.

  • Direct Washington Dulles International Airport to Seattle tickets are available for booking. Seattle-Tacoma International Airport (SEA) is where you'll arrive.

  • Leading airlines that operate direct flights from Washington Dulles International Airport to Seattle include:

  • Located around 40 kilometres from the centre of Washington DC, IAD can be reached in about 50 minutes by car (depending on traffic). The journey on public transport will take roughly 1 hour 10 minutes.

  • Want a relaxed start to your trip? Stay near IAD. Whether you've booked an early flight from Washington Dulles International Airport to Seattle or don't want departure day to feel hectic, these hotels are all about convenience:

  • When it comes to Washington Dulles International Airport's on-time performance, data shows 74.39% of flights stick to their scheduled arrival time.

  • IAD is located at 1 Saarinen Circle.

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

  • Rs29,321 is the cheapest price we've seen for a one-way Washington Dulles International Airport to Seattle flight. A return flight ticket right now is Rs49,909. Depending on the availability and when you book, these fares can change.

  • To snag cheap flights from IAD to Seattle, reserve your trip two months before your departure date.

  • June is the best month for scoring an awesome deal on Washington Dulles International Airport to Seattle tickets. If you'd like to travel at a different time of year, the 'Whole month' tool will give you the lowest prices for each month.

  • Snapping up a cheap flight from IAD to Seattle couldn't be easier with Price Alerts. All you need to do is set up one of these automatic notifications and we'll notify you when the price has dropped.

  • Snag an affordable flight from Washington Dulles International Airport to Seattle with the help of our filters. Select your ideal times, number of stops 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) is around 23 kilometres from the centre of Seattle. If you're getting a cab or a ride-share, the drive takes roughly 20 minutes.

  • When travelling on public transport, expect a journey time of about 55 minutes.

  • The last thing you want is a lengthy journey to your hotel if you're arriving on a late flight from Washington Dulles International Airport to Seattle. Reserve one of these accommodation options near SEA instead:

  • Pick up a Seattle-Tacoma International Airport rental car and discover Seattle and beyond with your own set of wheels. Thrifty, Europcar and Budget are popular providers to choose from here.

  • Reserving your ride from Seattle-Tacoma International Airport around one week before your flight from IAD to Seattle can help you lock in the lowest rate.

Lake Union Sea Plane Base Airport (LKE)

  • Once your flight from Washington Dulles International Airport to Seattle has landed, you can get to the city centre in about 10 minutes by car. Central Seattle is roughly 3 kilometres from Lake Union Sea Plane Base Airport (LKE).

  • If you're catching public transport, it'll take about 25 minutes.

  • Place the 'Do not disturb' sign on your door and relax at a hotel close to LKE. Here are a few options where you can kick back after your IAD to Seattle flight:

Best time to go to Seattle

  • Carefully consider your trip dates before locking in your flight from Washington Dulles International Airport to Seattle. The city comes alive during high season, but hotel rates are often higher and top attractions can get crowded. Visit Seattle in the off-season for a quieter vibe.

  • Before booking a Washington Dulles International Airport to Seattle flight ticket, think about what kind of weather you prefer. August is the warmest month in Seattle, with temperatures ranging from 12ºC to 28ºC.

  • Look for cheap tickets from IAD to Seattle in February if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -1ºC and 11ºC on average.

More about Seattle

  • When it comes to looking for somewhere to rest your head, you'll find the most popular stays in Seattle right here. Explore these hotels once you've locked in your flight from Washington Dulles International Airport to Seattle:

  • There are so many things to do and see in this city it can be tricky to work out where to begin. LMN Architects, Greyhound: Bus Station and Boeing Radiation Effects Lab are top sights which should be on any well-planned Seattle itinerary.

Explore more of United States

  • Seattle has plenty going for it, but there are so many other corners of United States you'll want to see. Around 241 kilometres south of Seattle, a visit to Portland will keep your itinerary busy. Start with leading attractions like Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • Spokane is another well-known destination in United States and is around 370 kilometres east of Seattle. No trip is complete without a visit to Manito Park, Northwest Museum of Arts & Culture and Spokane Falls.

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.