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United Flights from SEA to IAD

How much is a United flight from Seattle (SEA) to Washington (IAD)?

One-way flights start as little as and there are roundtrips available from . Get in! You can score some sweet deals with Wotif and United.

How many non-stop United flights from Seattle (SEA) to Washington (IAD) are there per day?

United flies 2 flights direct every day between Seattle (SEA) and Washington (IAD).

How far is Seattle (SEA) from Washington (IAD)?

It’s 3701 km from Seattle (SEA) to Washington (IAD).

What is the best airline to fly from Seattle - Tacoma Intl.?

At Wotif, we give you all the available options from our reputable partners. Select the airline that best suits your preferences and membership loyalties. You can fly from Seattle - Tacoma Intl. with: .

Can I change or cancel my United tickets from Seattle to Washington on Wotif?

Change of plans? No worries! We’re right here to make things as easy as possible. Check out the United rules and restrictions in your itinerary. You can also use the No Change Fees filter to find flexible plane tickets for future trips. For more information on how to cancel or change your flight on Wotif, visit our customer service portal.

How do I find the best deal on United flights from Seattle (SEA) to Washington (IAD)?

Just review and compare all our awesome offers or enter your travel dates to see more terrific deals on United flights from Seattle. And remember you can save even more when you bundle a hotel with your flight as part of a Wotif package. Sweet!

What’s a good way to get cheap United flight tickets from Seattle to Washington?

We have loads of cheap flights, so just enter your travel dates to see what’s available. If you can be flexible on when you fly, you’ll find even more epic flight deals. So get booking!

What is the cheapest time of year to fly from Seattle (SEA) to Washington (IAD)?

The cheapest time of the year for a return trip is . One-way, the cheapest month to fly is . Check our deal cards for details.

How long does it take to fly from SEA to IAD?

It typically takes 11 hours 8 to fly directly from Seattle (SEA) to Washington (IAD).

Epic Hotel in Washington

Hyatt Regency Dulles

2300 Dulles Corner Blvd, Herndon, VA

"The room was colder than I wanted it to be. I tried to adjust the A/C but was unsuccessful. Also, the people in the room next to me on my left-side were loud talking. I mentioned this to the front desk employee. I also asked for a copy of my bill from front desk and was not given it to me."

Reviewed on 27 Sept 2025

Hyatt Place Herndon Dulles Airport East

13711 Sayward Blvd, Herndon, VA

good stay

"internet and tv were gone a few times"

Reviewed on 28 Sept 2025

Courtyard by Marriott Dulles Airport Herndon

13715 Sayward Blvd, Herndon, VA

"Didn’t take advantage of amenities."