Cheap Flights from Seattle to Washington Dulles

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Find the cheapest month or even day of the year to fly to Washington Dulles

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Flight deals from Seattle to Washington Dulles

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

Find the cheapest month to fly from Seattle to Washington Dulles

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

Direct flights from Seattle to Washington Dulles

Seattle to Washington Dulles: Alternative routes

Compare routes from Seattle to Washington D.C. below. You may find an airport to fly into that's cheaper, faster, or easier than Washington Dulles.

Seattle to Washington D.C.: Flight information

The things to know before you go.
Cheapest flight foundRs26,239
Cheapest month to flyNovember
Average flight time5 hrs, 1 min
Most popular airlineAir Tahiti Nui
Average flights per week136

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

The best price we found for a return flight from Seattle to Washington Dulles is Rs62,881. 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 1 minute is the average flight time from Seattle to Washington Dulles.
Air Tahiti Nui, Qatar Airways and Alaska Airlines fly direct from Seattle to Washington Dulles.
As of October 2025, there are 136 flights per week flying from Seattle to Washington Dulles.
The cheapest month to fly from Seattle to Washington Dulles is usually November.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Washington Dulles Airport on Thursday, 13 November 2025.
Yes – the average flight time is 5 hours and 1 minute.
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 Washington Dulles 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 Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.
The cheapest airline that flies to Washington Dulles is Hawaiian Airlines .

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

  • Your next big escape starts at Seattle's main airport, Seattle-Tacoma International Airport (SEA). Explore your options for booking a flight from Seattle to Washington Dulles International Airport (IAD) departing from this terminal.

  • 5 hours is the average journey time for a direct Seattle to Washington Dulles International Airport flight.

  • The timezone in Washington DC is UTC-4, which is three hours ahead of Seattle. Washington Dulles International Airport is located in Washington DC.

  • The most popular route is from Seattle-Tacoma International Airport (SEA) to Washington Dulles International Airport (IAD), with 40 direct weekly services. If you're ready to head out sooner, the earliest flight from SEA to IAD is the 8am United Airlines service. If a later start suits your schedule, the final departure is at 11:40pm with Alaska Airlines.

  • Give yourself plenty of time to catch your flight from Seattle to IAD. As a general rule, turn up two hours before international departures and an hour ahead for domestic flights.

  • If you're taking off during a major holiday or other peak period, allow extra time. Arrive two hours before domestic flights and up to four hours before international departures. Security and check-in lines will be longer.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • You can take a direct flight from Seattle to Washington Dulles International Airport (IAD) leaving from Seattle-Tacoma International Airport (SEA).

  • You'll have your pick of carriers operating direct flights from Seattle to Washington Dulles International Airport departing from SEA. Book your ticket with one of these:

  • The airline with the highest booking numbers between SEA and IAD is Alaska Airlines.

  • With a reliable 86.46% of services arriving on schedule, United Airlines is the most punctual carrier operating on this route.

  • The journey from central Seattle to SEA takes about 55 minutes on public transport. If you ride-share, drive or take a cab, you'll cover the 23 kilometres in 20 minutes or so, depending on traffic conditions.

  • Searching for a comfortable hotel near Seattle-Tacoma International Airport? If you've booked an early flight from Seattle to Washington Dulles International Airport, these stays will have you sleeping moments from your departure gate:

  • Seattle-Tacoma International Airport has a solid on-time record, so you're less likely to experience disruptions. Departures from SEA land on schedule 81.27% of the time.

Lake Union Sea Plane Base Airport (LKE)

  • LKE is around 3 kilometres from central Seattle. It'll take you 10 minutes or so to get to the airport in a car from the city centre. Public transport takes approximately 25 minutes.

  • Want to enjoy an extra night away before your Seattle to IAD flight? Check in to a hotel near Lake Union Sea Plane Base Airport before your trip officially begins. These stays have your key waiting:

About Washington Dulles International Airport (IAD)

Getting from Washington Dulles International Airport (IAD) to central Washington DC

  • Washington Dulles International Airport is about 40 kilometres from central Washington DC. The time it takes to get there by cab or car hire will depend on the time of day. Do a little research before you go.

  • It typically takes 1 hour 10 minutes to get there using public transport.

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

  • Rs26,239 is currently the lowest price for a one-way ticket from Seattle to Washington Dulles International Airport. Return flights start at Rs62,881. These fares can change based on demand.

  • Booking in advance is often the key to scoring a cheap flight from Seattle to IAD. Fares tend to rise as demand increases, so the closer your departure date, the more you'll likely pay.

  • Cheap Seattle to Washington Dulles International Airport tickets are easier to find when your travel dates are flexible. Use the 'Whole month' search tool to compare fares across the month and then pick the cheapest day.

  • Save time looking for cheap flight tickets from Seattle to IAD by setting up a Price Alert. We'll send you an email or push notification on the app when prices go down.

  • Tailor your travel plans using filters. Choose your ideal arrival and departure times, airlines and total journey duration. You can also sort the results by 'Fastest,' 'Cheapest' or 'Best' flights from Seattle to Washington Dulles International Airport.

The best time to fly from Seattle to Washington Dulles International Airport (IAD)

  • Think about the kind of experience you want when deciding when to fly. February is the quietest month to visit Washington DC. July is when most people book flights from Seattle to Washington Dulles International Airport (IAD), which may be perfect if you're after more action.

  • Book a Seattle to IAD flight ticket departing in July if you want to experience the city during its warmest month. You can expect temperatures in Washington DC to range from 19ºC to 33ºC.

  • Look for cheap tickets from Seattle to Washington Dulles International Airport in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -6ºC and 10ºC.

More about Washington DC

Explore more of the United States

  • Philadelphia is just one of the many places in the United States waiting to be explored after you've seen Washington DC. Around 225 kilometres away to the north-east, check out popular attractions including Independence Hall, Liberty Bell and Philadelphia Museum of Art.

  • If you're ready to explore another corner of the United States, head for Virginia Beach, roughly 274 kilometres south-east of Washington DC. Virginia Beach Oceanfront, Virginia Beach Boardwalk and Resort Beach are key reasons to visit.

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