$169 Find Cheap Flights from Seattle to Washington Dulles Airport - Compare and Save

These are the earliest and latest flight times available from Seattle to Washington, D.C. Dulles Intl Airport:

• Earliest: departs at 8:07 am and lands at 1:06 pm
• Latest: departs at 10:50 pm and lands at 3:49 am.

The flight takes about 4h 59m.

Three cabin classes are available on flights from Seattle to Washington, D.C. Dulles Intl Airport:

• Economy Class
• Business Class
• First Class

A nonstop flight from Seattle to Washington, D.C. Dulles Intl Airport takes 4h 59m, covering 2,299 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Round-trip flights from Seattle to Washington, D.C. Dulles Intl Airport range from $351 to $606, with an average of $460 over the past 12 months. Anything below $351 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 82% above the $460 route average. Book 17 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $296 round-trip via Charlotte Douglas (CLT), compared to $466 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $35–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Boeing 737 family is used most often on this route, operated mainly by American Airlines and United Airlines. Other aircraft seen on the route include Boeing 737 MAX 9 variants.

Morning is the busiest departure period on Seattle to Washington, D.C. Dulles Intl Airport flights, with 50% of flights leaving in that window. Afternoon departures account for 25%, night flights for 25%, and evening flights for 0%.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $297 to $1,992. That means the highest observed fare was about 7x higher than the lowest one.

Two airlines offer in-flight Wi-Fi on Seattle to Washington, D.C. Dulles Intl Airport flights:

• Alaska Airlines
• Delta

Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

One-way fares from Seattle to Washington, D.C. Dulles Intl Airport are currently lower than usual. Average one-way flight prices are about $178, which is 41% below the typical average for this route.

Washington, D.C. Dulles Intl Airport (IAD) hosts 5 major car rental companies, with daily rates averaging $70 for economy cars. Top options include:

• Dollar
• Hertz
• Budget
• Sixt
• Thrifty

Flights from Seattle to Washington, D.C. Dulles Intl Airport usually depart from Seattle/Tacoma Intl (SEA) and arrive at Washington, D.C. Dulles Intl (IAD).

One-stop flights from Seattle to Washington, D.C. Dulles Intl Airport most commonly connect through:

• Las Vegas Harry Reid Intl (LAS) - 57% of one-stop connections
• Denver Intl (DEN) - 17% of one-stop connections
• Charlotte Douglas (CLT) - 13% of one-stop connections
• San Diego (SAN) - 13% of one-stop connections

Yes. Flexible dates can save you up to 21% on flights from Seattle to Washington, D.C. Dulles Intl Airport. Thursday is the cheapest departure day at $431 round-trip on average, while Monday is the most expensive at $541, a difference of $110.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

3 airlines operate flights between Seattle and Washington, D.C. Dulles Intl Airport. The airlines offering nonstop flights on this route include:

• Alaska Airlines
• United Airlines
• Delta

Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 7h 52m, compared with 8h 17m via Charlotte Douglas (CLT) and 12h 58m via San Diego (SAN).

Washington, D.C. Dulles Intl Airport is 3 hours ahead of Seattle (Eastern Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in Washington, D.C. Dulles Intl Airport are Walter E. Washington Convention Center, National Mall and Capital One Arena. These are among the most viewed places in Washington, D.C. Dulles Intl Airport on KAYAK.

Among airlines operating Seattle to Washington, D.C. Dulles Intl Airport flights:

• Alaska Airlines: offers extra legroom; offers free seat selection
• United Airlines: offers extra legroom; offers free seat selection
• Delta: offers extra legroom; offers free seat selection
• American Airlines: offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• Alaska Airlines: a cabin bag and a checked bag in Economy Class
• United Airlines: a cabin bag and a checked bag in Economy Class
• Delta: a cabin bag and a checked bag in Economy Class

Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

If you want a quiet place where you can relax while you wait for your flight from Seattle to Washington, DC, you can head to the Club at SEA. There are two locations in Concourse A. The one by Gate A12 is open from around 5 am to midnight. The second is above Gate S10 on the mezzanine floor and is open from about 6 am to 7 pm. For about $45, you can enjoy snacks and beverages, including bar service, as well as television and magazines.

Many airlines offering flights to Washington Dulles Airport from Seattle provide inflight entertainment. You can check which ones do by expanding the aircraft details in your KAYAK search results. For example, United Airlines has both personal seatback systems as well as streaming options for passengers to enjoy movies, music, and shows.

If you are traveling with your pet or service animal, both airports have pet relief stations with waste disposal bags and trash receptacles. In SEA, there are several pet relief areas throughout the airport, including in the main terminal and in Concourses D, S, and N. In IAD, you can find them by Gates D1 and A32, as well as by the parking lot across from the exit by Baggage Claim 1.

Many of the major car rental companies offer services at IAD, including Avis, Enterprise, and SIXT. You can catch a shuttle to locations outside Doors 2 and 4 from baggage claim at Curbs 2C or 2D.