Question 1

How much does a flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) cost?

Accepted Answer

You can find cheap one-way flights from $1,184 and cheap return flights from $2,649 IAD to BFI with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to BFI ticket fares go up or down.

Question 2

What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

The cheapest month to fly from IAD to BFI is August when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.

Question 3

Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

Enter IAD to BFI and your travel dates, then apply the 'Nonstop' filter to see only direct flights.

Question 4

What is the cheapest airline that flies from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

Alaska Airlines is the carrier that flies from Washington, DC (IAD) to Seattle, WA (BFI). Use Expedia's flight search tool to compare airlines on this route and find our cheapest option for your trip. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.

*Prices based on flights available on Expedia in the last year.

Question 5

How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

Question 6

What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.

Question 7

What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from IAD to BFI. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.

Question 8

Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

Select the "Business class" and "First class" filters when looking for IAD to BFI flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.

Question 9

How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) flight with Expedia?

Accepted Answer

It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

Question 10

What airports do you fly into for Seattle from Washington Dulles Intl. (IAD)?

Accepted Answer

From Washington Dulles Intl. (IAD), you can fly into Seattle - Tacoma Intl. (SEA) to reach Seattle. Some flights may connect through major hubs like Denver Intl. (DEN), Los Angeles Intl. (LAX), Pittsburgh Intl. (PIT) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Question 11

Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) at the last minute?

Accepted Answer

Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Question 12

Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) flight and hotel package?

Accepted Answer

Securing a Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) Seattle Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

Question 13

Can I cancel or change the date of my flight from Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field)?

Accepted Answer

If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Seattle, WA (BFI-Boeing Field) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Origin airport	Washington Dulles Intl.
Destination airport	Boeing Field
Roundtrip price	$2,648
Distance	2299 mi

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$1,184 Cheap Flights from Washington (IAD) to Seattle (BFI)