IAD to SEA (Washington to Seattle) Flights

Last Minute Flights from IAD to SEA

Best airfare and ticket deals for IAD to SEA flights are based on recent deals found by Expedia.com customers within the past 7 days.

OriginDestinationTravel DatesFlights From*
IADSeattleMarch 30 to April 18$547
*Prices include taxes and fees

Cheapest IAD to SEA Flights

Best airfare and ticket deals for IAD to SEA flights are based on recent deals found by Expedia.com customers within the past 7 days.

OriginDestinationTravel DatesFlights From*
IADSeattleApril 24 to May 4$231
IADSeattleApril 20 to April 22$250
IADSeattleMay 2 to May 3$257
IADEverettMay 14 to May 21$365
*Prices include taxes and fees
IAD to SEA Flight Details
Origin airport
Washington Dulles Intl.
Origin airport IATA code
IAD
Destination airport
Seattle - Tacoma Intl.
Destination airport IATA code
SEA
Distance
2299 mi

Frequently asked questions

Which airlines with flights from Washington, DC Airport (IAD-Washington Dulles Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.) allow free cancellation due to COVID-19?
We make it quick and easy to find tickets with cancellation flexibility in response to COVID-19. After entering your dates and destination, simply click on “No change fee.” It’s under the “Flexible change policies” heading on the left. Like always, make sure you read through the airline’s terms and conditions thoroughly before reserving your seats from Washington, DC Airport (IAD-Washington Dulles Intl.) to Sea-Tac Airport.
What airlines fly direct from Washington, DC Airport (IAD-Washington Dulles Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.)?
Avoid tedious stopovers and go straight from Washington, DC Airport (IAD-Washington Dulles Intl.) to Sea-Tac Airport with Alaska Airlines (AS). This renowned carrier offers 52 nonstop flights on this route per month. You can also fly on one of the 30 nonstop monthly flights provided by United Airlines (UA). No changing planes? No hassles.
How many flights are there from IAD to SEA?
No less than 3 services operate each day between Washington, DC Airport (IAD-Washington Dulles Intl.) and Seattle, WA Airport (SEA-Seattle - Tacoma Intl.). Fasten your seat belt because your plane to Seattle is ready to take to the skies.
How long does it take to fly from Washington, DC Airport (IAD-Washington Dulles Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.)?
You’ll be aboard the plane for about 5 hours and 58 minutes from Washington, DC Airport (IAD-Washington Dulles Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.), so dress in comfortable clothing. Sweatshirts, loose pants and flat shoes are all great options for a flight of this duration.
What is the flight distance from Washington, DC Airport (IAD-Washington Dulles Intl.) to Seattle, WA Airport (SEA-Seattle - Tacoma Intl.)?
At 2300 miles (3700 km), this medium-haul flight is no ultramarathon, but it’s no quick hop either. Get to Seattle feeling rested and recharged by enjoying some shut-eye along the way.
How many morning flights are there from IAD to SEA?
On average, 6 a week. Take off with top airline, Alaska Airlines (AS), and you’ll have 6 early services to pick from. AS’s earliest departure from IAD to SEA is 11:15AM.
How many afternoon flights are there from IAD to SEA?
With around 20 afternoon and evening flights every week from IAD to SEA, you don’t have to be anxious about waking up too early. Delta (DL) has 7 weekly flights after midday, with its earliest departure at 11:21PM.
What is the earliest departure time out of Loudoun County to Seattle?
The earliest flight flies from IAD at 7:15AM and arrives at SEA at 1:10PM. Remember to give yourself adequate time in the morning to make it to your gate.
What is the latest departure time out of Loudoun County to Seattle?
Book a seat on the 7:21PM flight from IAD, arriving at 1:15AM at SEA, and give yourself time to carry out those last-minute vacation preparations. This is the latest flight you can take on this route.
What is the average price from Loudoun County to Seattle?
Round-trip journeys for this route start from around $231. When you’re ready book your trip, we’ll help you land the best possible price. This price was available on Flights.com within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Washington to Seattle Flights

Whether it’s for an obligation or the sake of your sanity, sometimes you need to get away. Maybe you need flights from Washington to Seattle to attend your cousin’s wedding, to pitch a business idea to your boss, or perhaps simply to treat yourself to a mini vacation. Regardless of the reasons behind packing your bags and needing to find the cheapest flights from IAD to SEA, we’ve got you covered here at Flights.com.

We present you with some of the hottest deals on airfare so stop that Google flights search. We want you to spend less on your flight from Washington to Seattle, so you can spend more during your getaway. With Flights.com, you’ll find it simple to land airline tickets with itineraries matching your travel schedule. What’s more, we provide you with all the information you need to confidently make reservations on your family, business, or personal trip.