C$ 236 Find Cheap Flights from Seattle to Washington Dulles Airport – Compare and Save

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.

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

• Alaska Airlines
• United Airlines
• Delta

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).

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

• Alaska Airlines: a carry-on bag and a checked bag in Economy Class
• United Airlines: a carry-on bag and a checked bag in Economy Class
• Delta: a carry-on bag and a checked bag in Economy Class

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

Only Economy Class is available on flights from Seattle to Washington, D.C. Dulles Intl Airport.

On this route, layover flights are cheaper than direct options on average. Layover fares average C$ 403 round-trip via Charlotte Douglas (CLT), compared to C$ 620 for direct.

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 49–C$ 139 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 737-800 Passenger/BBJ2 (winglets) variants.

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

• Las Vegas Harry Reid Intl (LAS) – 53% of one-stop connections
• Denver Intl (DEN) – 16% of one-stop connections
• San Diego (SAN) – 16% of one-stop connections
• Charlotte Douglas (CLT) – 11% 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 24% on the Seattle to Washington, D.C. Dulles Intl Airport route. Thursday is the cheapest departure day at C$ 561 round-trip on average, while Monday is the most expensive at C$ 729, a difference of C$ 169. 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 Seattle to Washington, D.C. Dulles Intl Airport flights, with 50% leaving in that window. Afternoon departures account for 25%, Night flights for 25%, and Evening flights for 0%.

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

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 1:10 pm
• Latest: departs at 11:14 pm and lands at 4:17 am.

The flight takes about 5h 03m.

Last-minute fares on this route – booked within 2 weeks of departure – run 87% above the route average of C$ 611. Book 17 weeks before departure for the lowest fares.

A direct flight from Seattle to Washington, D.C. Dulles Intl Airport takes 5h 03m, covering 5,953 km.

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 C$ 400 to C$ 2,342. That means the highest observed fare was about 6x higher than the lowest one.

One-way fares from Seattle to Washington, D.C. Dulles Intl Airport are currently lower than usual. Average one-way flight prices are about C$ 281, which is 31% below the typical average for this route.

Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 7h 45m, compared with 8h 17m via Charlotte Douglas (CLT) and 8h 34m via Phoenix Sky Harbor Intl (PHX).

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.

Washington, D.C. Dulles Intl Airport (IAD) hosts 5 major car rental companies, with daily rates starting from around C$ 33 for economy cars. Top options include:
• Dollar
• Budget
• Hertz
• Sixt
• Thrifty

Round-trip flights from Seattle to Washington, D.C. Dulles Intl Airport range from C$ 462 to C$ 824, with an average of C$ 611 over the past 12 months. Anything below C$ 462 counts as a good deal.

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.