$178 Find Cheap Flights from Washington Dulles Airport to Seattle - Compare and Save

There are a few options to get you from the airport to your hotel in downtown Seattle. One option is the subway system that picks up passengers on the 4th floor of the parking garage. There are a couple of bus services at the Sea-Tac Airport. King County Metro travels to various parts of the city of Seattle while Sound Transit takes passengers to the outlining cities of Bellevue and Renton. The buses pick up by the subway station.

Very close to the terminal, there is a parking garage and a terminal parking lot. There is also an economy lot a little further away. A shuttle service will take you from the economy lot to the main terminal of the airport.

There are a couple of bars, a pizzeria, and a burger place where you can dine. Some well-known restaurants in this airport include Auntie Anne's, Carrabba's Italian Grill, Chick-Fil-A, and Jersey Mike's Subs.

Both airports have lounges where you can enjoy some quiet time. These lounges also offer complimentary drinks and snacks. They are sponsored by airlines, credit card companies, or the airport. At the Washington Dulles Airport, there is a United Airlines, British Airways, and an Air France lounge. The Sea-Tac Airport has lounges affiliated with United Airlines, American Express, Delta Airlines, and Alaska Airlines.

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

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

• Alaska Airlines
• United Airlines
• Delta

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

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 travelers should check the fare details before booking.

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

• Economy Class
• Business Class
• First Class

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $354 round-trip via San Diego (SAN), compared to $445 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.

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

• Las Vegas Harry Reid Intl (LAS) - 54% of one-stop connections
• Charlotte Douglas (CLT) - 12% of one-stop connections
• Minneapolis St Paul (MSP) - 10% of one-stop connections
• Denver Intl (DEN) - 7% of one-stop connections

Las Vegas Harry Reid Intl (LAS) handles the largest share of one-stop connections on this route.

Yes. Being flexible with your travel dates can save you up to 21% on the Washington, D.C. Dulles Intl Airport to Seattle route. Tuesday is the cheapest departure day at $411 round-trip on average, while Sunday is the most expensive at $517, a difference of $106. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Morning is the busiest departure period on Washington, D.C. Dulles Intl Airport to Seattle flights, with 60% of flights leaving in that window. Evening departures account for 40%, afternoon flights for 0%, and night flights for 0%.

Some of the most popular sights in Seattle are Pike Place Market, Lumen Field and Space Needle. These are among the most viewed places in Seattle on KAYAK.

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

• Earliest: departs at 7:00 am and lands at 12:51 pm
• Latest: departs at 5:57 pm and lands at 11:48 pm.

The flight takes about 5h 51m.

Last-minute fares on this route - booked within 2 weeks of departure - run 73% above the route average of $442. Book 8 weeks before departure for the lowest fares.

A nonstop flight from Washington, D.C. Dulles Intl Airport to Seattle takes 5h 51m, 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.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $280 to $1,522. That means the highest observed fare was about 5x higher than the lowest one.

One-way fares from Washington, D.C. Dulles Intl Airport to Seattle are currently lower than usual. Average one-way flight prices are about $184, which is 38% below the typical average for this route.

Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 7h 40m, compared with 7h 55m via Minneapolis St Paul (MSP) and 7h 57m via Chicago O'Hare Intl (ORD).

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

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates starting from around $4 for economy cars. Top options include:
• Fox
• Europcar
• Thrifty
• Budget
• Dollar

Round-trip flights from Washington, D.C. Dulles Intl Airport to Seattle range from $337 to $577, with an average of $442 over the past 12 months. Anything below $337 counts as a good deal.

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